Neuroscience of Meditation

Can You Choose Which Nostril Is Open?

2026-11-03T06:00:18+05:30

Most of what I have written about the Shiva Svarodaya has been about where it fails. The verse that predicts which nostril will be open from the lunar day is the rule the whole system rests on, and it is the one the evidence contradicts.

So I had been reading the text as a forecaster and grading it as a forecaster. That was an incomplete reading. The text does not only claim you can tell which nostril is flowing. It claims you can change it, deliberately, and that changing it is the point of knowing.

That is a different kind of claim, and a better one. A forecast can be right by luck. An intervention either moves the thing or it does not. So I went looking for whether this one does.

On the bank above Rishikesh.

The instruction nobody quotes

The famous verses of this text are the ones about what the breath means. The operational verses are duller and more useful.

शशाङ्कं वारयेद्रात्रौ दिवा वारयेद्भास्करम्। इत्यभ्यासरतो नित्यं स योगी नात्र संशयः॥६६॥ सूर्येण बध्यते सूर्यश्चन्द्रश्चन्द्रेण बध्यते। यो जानाति क्रियामेतां त्रैलोक्यं वशगं क्षणात्॥६७॥

śaśāṅkaṃ vārayed rātrau divā vārayed bhāskaram | ity abhyāsarato nityaṃ sa yogī nātra saṃśayaḥ ||66|| sūryeṇa badhyate sūryaś candraś candreṇa badhyate | yo jānāti kriyām etāṃ trailokyaṃ vaśagaṃ kṣaṇāt ||67||

One should check the left channel at night and the right by day. Whoever is constantly devoted to this practice is a yogī, without question. Sun is bound by sun and moon by moon; whoever knows this operation gains mastery in an instant. — Verses 66–67

The verb is vārayet — to check, to hold back, to turn away. It is an instruction to act on the breath, not to watch it. And verse 101 is blunter still: kāryaṃ nāḍīpracālanam, the channel should be set flowing to suit the action.

Set flowing. The text treats which nostril is open as a dial you are expected to turn.

Four methods come down through the tradition for turning it: lie on the opposite side; apply sustained pressure into the armpit or against the side of the chest; breathe forcibly through one nostril; exert yourself physically. The second of these is why the yogadaṇḍa exists — the T-shaped crutch-staff you see in old images, wedged under the arm. It is usually explained as a prop for long sitting. The Svarodaya tradition treats it as an instrument.

Four methods, four claims. They do not hold up equally.

Lying on your side is the one that works

Here is the finding, and it surprises people: lying on one side opens the other nostril. The side you are resting on congests. The side in the air clears.

Kahana-Zweig and colleagues give the cleanest evidence. In PLoS ONE in 2016 they fitted 33 healthy adults with a dual-nostril airflow logger and recorded them for a full 24 hours — the largest continuous dataset on the nasal cycle I know of. Posture tracked dominance, and it tracked it contralaterally. Mean laterality was 0.21 while lying on the left and −0.29 while lying on the right, a difference significant at p < 0.002.

The older rhinometry work points the same way. Roithmann and colleagues, writing in the Brazilian Journal of Otorhinolaryngology, summarise the side-lying studies that preceded theirs. Fouke and Jackson put eight people on their right side for fifteen minutes: the lower nasal cavity’s volume fell from about 29.3 to 19.5 cm³ while the upper cavity’s rose from about 20.9 to 25.5 cm³. Cole and Haight had reported the same direction in 1984 — patency down on the side turned down, up on the other, with total resistance barely changed in healthy people.

Fouke and Jackson, eight subjects, as summarised by Roithmann and colleagues. The side you rest on closes; the side in the air opens.

Now the honest part. Eight people. Fourteen in O’Flynn’s study, which did not fit the pattern at all — his changes were larger on the side that started out open, and did not reach significance. Thirty-three in the biggest one. These are small studies, and the direction is consistent across them rather than the size of the effect.

But the direction is what the instruction needs. If you want the left nostril open, lie on your right side and wait. In the studies that tested it, the wait was five to fifteen minutes.

The crutch under the arm

Pressure in the armpit works the same way, and this is the method yoga books state most confidently and the literature documents least.

Eccles reported in Rhinology in 1986 that applying pressure to the axilla of a supine subject produced reciprocal changes in the two nasal passages — resistance up on the pressed side, down on the other — and attributed it to a reflex change in sympathetic tone. The dedicated study is Haight and Cole’s Unilateral Nasal Resistance and Asymmetrical Body Pressure, published the same year, which is where the effect is worked out properly.

That is the whole public evidence base as far as I can find it: two papers, 1986, overlapping authors. The effect is real and the mechanism is sensible — pressure receptors in the chest wall modulating sympathetic outflow to the nasal vessels on that side. But it rests on less than the side-lying result does, and it is stated in yoga teaching with far more confidence than the side-lying result, which is the wrong way round.

I should say that this closes something on my own list. When I built the swar yoga tool I graded the armpit method on the commentary alone, because I had not found a study. These two are the study. They are thinner than I would like, and I am recording them as what the claim actually rests on.

Exertion opens both sides, and not for long

The fourth method is the easiest to test and the least useful.

Fonseca and colleagues, in the Brazilian Journal of Otorhinolaryngology in 2006, measured nasal volume in 19 healthy young adults by acoustic rhinometry: at rest, immediately after five minutes of cycling at half their maximum power, and at 10 and 20 minutes afterwards. Total nasal volume rose by a mean of 33.3% (± 17.0), p < 0.001.

A third more airway, from five minutes on a bicycle. That is a large effect and it is not in doubt.

It is also the wrong tool for this job, for two reasons. It opens both sides — generalised sympathetic activation does not pick a nostril — so it cannot produce the asymmetry the text is asking for. And it does not last. By twenty minutes the volume was back to where it started: 12.4 cm³ against 12.1 cm³ at rest.

So exercise unblocks your nose. It does not steer it.

The method I could not find a study for

Verse 67 is the most specific of the four and the one I most wanted to check. Sun is bound by sun, moon by moon. Like acts on like. The reading that makes sense of it is that you reverse a dominant side by breathing hard through the side that is already open, until the system flips, rather than by trying to force the blocked side.

That is a sharp, testable, slightly counter-intuitive prediction, and I cannot find anyone who has tested it.

There is a literature on forced unilateral nostril breathing, going back to Shannahoff-Khalsa’s work in the late 1980s and continuing into recent EEG studies. But it asks a different question. It asks what breathing through one nostril does to you — to heart rate, to cognitive performance, to hemispheric measures. I could find nothing asking whether forced breathing through the open nostril reverses the dominance itself.

So the status of verse 67 is not “weak”. It is untested. I would rather say that plainly than grade it on nothing.

The strength of the evidence runs almost exactly opposite to the confidence with which each method is taught.

The objection, which is the interesting part

Here is where it turns on itself.

If posture moves nasal dominance this reliably, how much of the famous rhythm is a rhythm at all? Haight and Cole asked exactly that, in The Laryngoscope in 1989, under the title Is the nasal cycle an artifact? The role of asymmetrical postures. If every hour you spend leaning on one elbow is an hour in which the nostril is being set from outside, then some of what has been recorded as an endogenous two-hour clock is a record of how people happened to be sitting.

The Kahana-Zweig data speak to this a little. They found no change in laterality amplitude immediately before versus after a change of position, which argues against the cycle being a simple artefact of moving about. But that analysis was aimed at a narrower worry — whether the measuring cannula was being squashed in recumbency — and it does not settle the broader question.

And note what this does to the two halves of the text. The better the steering works, the worse the forecasting looks. A nostril that can be flipped by lying down for ten minutes is not a nostril that was ever going to keep to a lunar timetable. The Svarodaya’s most defensible mechanism quietly undermines its most famous claim.

I find that more interesting than either half on its own.

The one instruction that lands

One more verse, because it is the best practical line in the book and it works for a reason the book could not have known.

भुक्तमार्गेण मन्दाग्नौ स्त्रीणां वश्यादिकर्मणि। शयनं सूर्यवाहेन कर्तव्यं सर्वदा बुधैः॥१२२॥

bhuktamārgeṇa mandāgnau strīṇāṃ vaśyādikarmaṇi | śayanaṃ sūryavāhena kartavyaṃ sarvadā budhaiḥ ||122||

When digestion is sluggish after eating, the wise should always lie down with the right channel flowing. — Verse 122

Work the mechanics. To lie down with the right nostril flowing, you must lie on your left side, because the down-side congests. The instruction “sleep with the sun channel flowing” is, operationally, the instruction “sleep on your left side after a heavy meal.”

Which is the standard positional advice for reflux. Khoury and colleagues monitored oesophageal pH in patients with reflux disease during spontaneous sleep and published it in The American Journal of Gastroenterology in 1999: the right lateral position was associated with more nighttime acid exposure than the left. In the left lateral position the junction between oesophagus and stomach sits above the pool of gastric contents; on the right it sits below it. Ten patients, so not a large study, but the direction has held up and positional advice is routine in reflux management now.

The text gets the right answer about post-meal discomfort through a theory about solar and lunar channels that has nothing to do with the mechanism. That happens more often than you would expect with this material, and it is worth being clear about what it does and does not license. It makes verse 122 a good instruction. It does not make the theory behind it true.

What I take from this

I have spent a lot of time grading this text as an oracle and finding it wanting. Read as an engineering manual, it does considerably better.

The claim that you can set which nostril is flowing is correct. The method it recommends most — change your posture — is the one with the best support, and the tradition found it with no instruments and no account of why it works. The crutch under the arm is probably real and thinly documented. The exertion method works and does the wrong thing. Its own signature trick, sun binding sun, nobody has checked.

What I would actually do with this: if one nostril is blocked and I want the other open, lie down on the blocked side for ten minutes. That is a lever I can pull and watch work, and the watching is the part that matters — it is falsifiable in ten minutes on my own face, which is more than can be said for most of what this text asserts.

I notice I trust the tradition more after writing this, and in a narrower way. Not as a system that knows what the breath means. As a long, patient record of people paying close attention to something real, and finding handles on it.

Sources

Kahana-Zweig R, Geva-Sagiv M, Weissbrod A, Secundo L, Soroker N, Sobel N. Measuring and characterizing the human nasal cycle. PLoS ONE (2016), 11(10):e0162918. doi.org
Roithmann R, Demeneghi P, Faggiano R, Cury A. Effects of posture change on nasal patency. Brazilian Journal of Otorhinolaryngology (2005), 71(4):478–484. Summarises the earlier side-lying studies of Fouke and Jackson (1992), Kase and colleagues (1994) and O’Flynn (1993). bjorl.org
Cole P, Haight JSJ. Posture and nasal patency (1984). pubmed.ncbi.nlm.nih.gov
Eccles R. The effects of posture on nasal resistance to airflow. Rhinology (1986), 24:75. rhinologyjournal.com
Haight JSJ, Cole P. Unilateral Nasal Resistance and Asymmetrical Body Pressure (1986). pubmed.ncbi.nlm.nih.gov
Haight JSJ, Cole P. Is the nasal cycle an artifact? The role of asymmetrical postures. The Laryngoscope (1989), 99(5). doi.org
Rohrmeier C, Schittek S, Ettl T, Herzog M, Kuehnel TS. The nasal cycle during wakefulness and sleep and its relation to body position. The Laryngoscope (2014). doi.org
Calvo-Henríquez C and colleagues. The recumbent position affects nasal resistance: a systematic review and meta-analysis. The Laryngoscope (2021). doi.org
Fonseca MT, Machado JAvP, Pereira SA, Pinto KM, Voegels RL. Effects of physical exercise in nasal volume. Brazilian Journal of Otorhinolaryngology (2006), 72(2):256–260. bjorl.org
Khoury RM, Camacho-Lobato L, Katz PO, Mohiuddin MA, Castell DO. Influence of spontaneous sleep positions on nighttime recumbent reflux in patients with gastroesophageal reflux disease. The American Journal of Gastroenterology (1999), 94(8). doi.org

Does Slower Breathing Make Meditation Deeper?

2026-11-01T14:21:01+05:30

Slow your breath and your meditation will deepen. You will have met this advice in some form, probably within your first week of practising. I have given it myself.

It contains two claims, and I had never properly separated them. The first is that slowing the breath changes your physiological state. The second is that the changed physiological state makes the awareness deeper.

The first is one of the better-evidenced things in this whole field. The second is close to untested, and the reason is interesting: not that anyone has looked and found nothing, but that nobody agrees what the second thing is or how you would measure it.

Artwork by Aditi.

There is no place where meditation happens

Before any of that, something worth getting straight, because it changes how you read every claim in this area.

There is no region of the brain that does meditation. There is not even one pattern that all meditation produces.

Fox and colleagues reviewed 78 functional neuroimaging studies of meditation, pooling 257 peak coordinates from 31 experiments and 527 participants. They compared seven styles. Four of them — focused attention, mantra recitation, open monitoring, and compassion or loving-kindness — showed reliably distinct patterns of activation and deactivation from one another. Three more showed differences that were only suggestive.

Some regions did come up across several techniques: the insula, the supplementary motor areas, the dorsal anterior cingulate, the frontopolar cortex. But the authors are explicit that this overlap is the exception rather than the rule, and their conclusion is that meditation should not be treated as one uniform state at all. It is a family of practices, and the brain patterns track what each practice is actually asking you to do.

That matters here because “deeper meditation” assumes a single dimension you can move along. Neurally, there may not be one.

What breathing actually reaches

Breathing is unusual among bodily functions in that it runs by itself and you can also take it over. That dual access is what makes it the standard handle.

The clearest evidence is autonomic. Laborde and colleagues pooled 223 studies of voluntary slow breathing in Neuroscience and Biobehavioral Reviews in 2022 — during the breathing itself, immediately after a single session, and after multi-session interventions. Vagally-mediated heart rate variability increased in all three. That is about as consistent as findings get in this literature, and it is why slow breathing turns up in so many protocols.

The second line is more surprising, and it is the one I find genuinely striking. Zelano and colleagues, in the Journal of Neuroscience in 2016, recorded directly from the brains of seven patients with electrodes implanted before epilepsy surgery, and found that the rhythm of breathing entrains oscillations in the piriform cortex, amygdala and hippocampus. They then ran behavioural experiments with around 60 people: fearful faces were identified faster when seen during inhalation than exhalation, and objects were remembered better when encountered during inhalation.

The part that matters for practice is what happened when they switched people to mouth breathing. Both effects faded. The entrainment is driven by airflow through the nose, not by the act of breathing as such.

So the tradition’s insistence on nasal breathing has something behind it, and the mechanism is not the one usually offered.

The part that holds up, and the part that does not

Here is the distinction I think the advice obscures.

The advice treats the two arrows as one. They are not the same kind of claim, and they do not have the same kind of evidence behind them.

You can be profoundly relaxed and not be meditating in any interesting sense. Most people reading this have fallen asleep in shavasana, which is maximal parasympathetic success and zero awareness. And it runs the other way too: clear, stable, strangely vivid attention sometimes arrives on an ordinary breath you never adjusted.

Physiological calm and depth of awareness are separate variables. The breathing literature measures the first beautifully. It has almost nothing to say about the second.

Why the second one is hard

The obstacle is measurement, which is the obstacle in most of this field.

I wrote a fortnight ago about a preprint I have not stopped thinking about. Lewis-Healey, Kringelbach, Canales-Johnson and Laukkonen recorded 33 experienced Transcendental Meditation practitioners, with a mean of nearly thirteen years of practice, against 33 matched controls. The meditators meditated for thirty minutes. The controls counted silently upwards in their heads for thirty minutes.

At the level of the brain measure the researchers were testing, there was no significant difference between the two groups in any frequency band.

What rescued the study was changing what they measured on the subjective side. Rather than a rating afterwards, participants traced how much effort they had felt, moment by moment, across the whole session. Reorganised around felt effortlessness instead of around the label “meditating”, a relationship appeared — and appeared more strongly in the practitioners.

I take two things from that. The state was real; the category was too coarse to find it. And depth, whatever it is, showed up as a subjective variable measured carefully over time, not as a physiological one. Nobody has run that design on breathing. Trace effortlessness minute by minute at six breaths per minute and at a natural rate, and you would have an answer. As far as I can find, it has not been done.

The prediction story, and what it is

There is a theoretical frame that makes the breathing question more interesting, and I want to introduce it carefully, because it is a frame rather than a finding.

The idea is that the brain is not a passive receiver of sensation. It continuously generates predictions about the causes of its sensory signals, compares them against what arrives, and updates. Karl Friston set out the most ambitious version of this in Nature Reviews Neuroscience in 2010, where it is described in terms of minimising variational free energy. The brain, on this account, is inferring the world rather than observing it — and it is inferring the body too, which is what interoception means.

Laukkonen and Slagter applied this to meditation in Neuroscience and Biobehavioral Reviews in 2021. Their argument is that deconstructive practices work by progressively disengaging anticipatory processing — that focused attention, open monitoring and non-dual practice sit on one continuum, each loosening more entrenched predictive habits, including the brain’s prediction of a self.

If that is right, part of why breath-focused practice works is unglamorous: the breath supplies a slow, regular, self-generated signal for attention to organise around. Not a sacred channel. A reliable clock.

Now the caveats, and they are not small ones. The free energy principle is not an explanation of conscious experience; it does not touch the hard problem, and Friston has not claimed it does. The meditation application is a hypothesis that fits the existing data, which is a much weaker thing than a hypothesis that has predicted new data. Laukkonen and Slagter say so themselves and call for the experiments. I find it the most useful frame available for thinking about why breathing is the handle. I would not cite it as a reason to believe anything.

One overclaim worth retiring

While I am here: meditation does not switch off the default mode network.

The finding people are reaching for is real. Brewer and colleagues, in PNAS in 2011, scanned experienced meditators against matched novices across concentration, loving-kindness and choiceless awareness, and found the core default mode regions — medial prefrontal and posterior cingulate cortex — relatively deactivated in the experienced group across all three. They also found stronger coupling between the posterior cingulate and control regions, both during meditation and at baseline.

That is a difference in activity and connectivity between groups. It is not an off switch, it was not the same across every practice, and a cross-sectional comparison of experienced meditators against novices cannot tell you which direction the causation runs. The sentence “meditation turns off the default mode network” has travelled much further than the study that is meant to support it.

What I actually do

Slow the breath, because the autonomic evidence is good and the cost is nothing. Through the nose, because the entrainment finding gives that a mechanism it did not have before. Longer out than in, which is the part of the folk advice the physiology supports best.

And then stop treating the calm as the achievement. It is the condition you set up, not the thing you came for. On the days the breath settles and nothing else does, the breathing still worked. It just was not the point.

I would still like someone to run the experiment.

Sources

Fox KCR, Dixon ML, Nijeboer S, Girn M, Floman JL, Lifshitz M, Ellamil M, Sedlmeier P, Christoff K. Functional neuroanatomy of meditation: a review and meta-analysis of 78 functional neuroimaging investigations. arXiv:1603.06342. arxiv.org
Laborde S, Allen MS, Borges U, Dosseville F, Hosang TJ, Iskra M, Mosley E, Salvotti C, Spolverato L, Zammit N, Javelle F. Effects of voluntary slow breathing on heart rate and heart rate variability: a systematic review and a meta-analysis. Neuroscience and Biobehavioral Reviews (2022), 138:104711. doi.org
Zelano C, Jiang H, Zhou G, Arora N, Schuele S, Rosenow J, Gottfried JA. Nasal respiration entrains human limbic oscillations and modulates cognitive function. Journal of Neuroscience (2016), 36(49):12448–12467. doi.org
Lewis-Healey E, Kringelbach M, Canales-Johnson A, Laukkonen R. Near-critical brain dynamics track effortlessness during meditation. bioRxiv preprint (2026). biorxiv.org
Friston K. The free-energy principle: a unified brain theory? Nature Reviews Neuroscience (2010), 11(2):127–138. doi.org
Laukkonen RE, Slagter HA. From many to (n)one: meditation and the plasticity of the predictive mind. Neuroscience and Biobehavioral Reviews (2021), 128:199–217. doi.org
Brewer JA, Worhunsky PD, Gray JR, Tang YY, Weber J, Kober H. Meditation experience is associated with differences in default mode network activity and connectivity. Proceedings of the National Academy of Sciences (2011), 108(50):20254–20259. doi.org

What Meditation Researchers Say When They Are Talking to Each Other

2026-10-27T12:02:39+05:30

I spent two days this month listening to meditation researchers talk to each other. Not to journalists, not to students, not to people deciding whether to take up a practice. To each other.

The register is completely different from the one you meet in an article about meditation, and I think the difference is worth writing down. In public the field speaks in findings. Among themselves they spend a surprising amount of time on what did not work, what did not replicate, and what their instruments cannot see. Several of the talks I found most useful led with a null.

That is a healthy field doing its job. It is also, if you only ever read the press coverage, completely invisible to you.

The published record is 87% positive

Start with the number that frames everything else.

Coronado-Montoya and colleagues went through 124 published randomised controlled trials of mindfulness-based mental health interventions and asked a simple question: how many reported a positive result? The answer, published in PLoS ONE in 2016, was 108 of them — 87%. By the trials’ own stated conclusions, 109 of 124 concluded the intervention worked.

Then they worked out how many should have been positive. Given the effect sizes typically claimed and the statistical power the trials actually had, the expected number was about 65.7, or 53%.

Coronado-Montoya and colleagues, PLoS ONE 2016. The gap between the two bars is the shape of what does not get published.

The observed-to-expected ratio is about 1.6, and it was worse in the smaller, weaker trials. The authors are careful about what this does and does not show: it is consistent with publication bias, with selective outcome reporting, or with both. It is not proof that any particular trial is wrong.

But it does tell you something about what you are reading. If roughly a third of the positive results in the literature should not be there, then the average article summarising “what the research says” is summarising a filtered sample. The nulls were run. Many of them were never printed.

So when a researcher stands up in front of their peers and opens with a failure, they are doing the thing the published record systematically fails to do.

The brain-change story, in two studies

The claim that meditation changes the physical structure of your brain traces largely to one paper, and it is worth looking at it closely, because it is a good paper that has been asked to carry far more than it can.

Hölzel, Carmody, Vangel, Congleton, Yerramsetti, Gard and Lazar published it in Psychiatry Research: Neuroimaging in 2011. Meditation-naive adults did an eight-week mindfulness-based stress reduction course and were scanned before and after; a waitlist group was scanned on the same schedule. Grey matter concentration increased in the left hippocampus, the posterior cingulate cortex, the left temporo-parietal junction, and parts of the cerebellum.

It is a careful study with a real control group. It is also small: sixteen people in the meditation arm after two dropped out, and seventeen controls.

In 2022, Kral, Davis, Korponay, Hirshberg and colleagues, with Richard Davidson, published the bigger version in Science Advances. Two combined randomised controlled trials, 218 meditation-naive adults, randomised three ways: eight-week MBSR, an active non-mindfulness wellness programme matched for time and attention, or no training at all. Grey matter volume, grey matter density and cortical thickness, across the whole brain and in regions of interest taken from the earlier literature.

They found nothing. No structural difference between MBSR and either control group. Their own phrase is that they found no evidence MBSR produced neuroplastic changes, and that they failed to replicate the prior findings.

Bars are drawn to scale, two pixels per participant. The larger, better-controlled study is the one that found nothing — which is the direction these things usually go.

I want to be fair to both papers, because the honest reading is not “the first one was wrong.”

The 2022 authors offer their own explanations. The earlier participants were self-selected into a stress-reduction course, which may mean they had more room to improve; the simple act of choosing to enrol may carry some of the benefit; longer or more meditation-specific training might produce something detectable where eight weeks does not. Any of those could be true.

What the pair of studies does establish is the size of the claim that survives. “Eight weeks of mindfulness reliably thickens your brain” is not supported. It was never supported by a single study of sixteen people, and the attempt to confirm it at scale did not confirm it.

One more detail from the 2022 trial that I keep thinking about. Both the mindfulness group and the active wellness group reported being more mindful than the untrained controls. The authors read that as a sign the self-reported gains may belong to wellness programmes in general rather than to meditation in particular. That is a quieter result than the brain scans and probably a more important one.

The largest school trial found nothing

If you want a single study that shows how the field has matured, it is MYRIAD.

Kuyken and a long list of colleagues ran a cluster randomised trial across 84 schools and 8,376 pupils aged 11 to 14, published in Evidence-Based Mental Health in 2022. Schools were randomised either to a standardised mindfulness curriculum or to teaching as usual. Three co-primary outcomes at one year: risk of depression, social-emotional-behavioural functioning, and well-being.

The standardised mean differences were 0.005, 0.02 and 0.02. All three confidence intervals cross zero. In plain terms: nothing.

Two things stop this being a simple story of failure. The trial did find improvements in school climate and in teacher burnout, though most of those faded within a year. And 80% of pupils did not do the practice they were set, which is a finding about implementation rather than about mindfulness — though it is also, arguably, the most realistic estimate anyone has of what a school mindfulness programme actually delivers when you run it in real schools at scale.

This is the trial that gets cited in the room and almost never in the wellness coverage.

A null the researcher led with

The talk I liked best was built around a result that did not come out.

Lewis-Healey, Kringelbach, Canales-Johnson and Laukkonen have a preprint on whether “critical” brain dynamics — a particular balance between rigid and chaotic activity, measured through long-range temporal correlations in EEG — mark the meditative state. They recorded 33 experienced Transcendental Meditation practitioners, with a mean of nearly thirteen years of practice, and 33 matched controls. Ten minutes of resting EEG, then thirty minutes of meditation for the practitioners and thirty minutes of silently counting upwards for the controls, then ten minutes of resting EEG again.

Compared with the meditators’ own resting state, meditation raised alpha and beta long-range correlations. So far so good.

Then the comparison that matters: meditators meditating versus controls silently counting. No significant difference in any frequency band. Thirteen years of practice, and at the level of this measure the brain was doing what a stranger counting in their head was doing.

What rescued the study was not a better brain measure. It was a better measure of experience. Instead of asking people to rate the session 0 to 10 afterwards, they had participants trace how much effort they had felt, moment by moment, across the thirty minutes. When the brain data were reorganised around that — around felt effortlessness rather than around the label “meditation” — a relationship appeared, and appeared more strongly in the meditators than the controls.

I find this the most instructive result of the lot, and not because of what it says about criticality. It is a demonstration that a null can be a measurement problem on the subjective side rather than the objective one. The state the practitioners were in was real. The category “is meditating” was simply too coarse to find it.

It is also a preprint, which means it has not yet been through peer review.

Things presented but not yet published

Two more results are worth recording, with a clear flag: these were presented at a research meeting, not published. I cannot link you to a paper, you cannot check my summary against one, and both may change before they appear in print. Treat them accordingly.

The first is directly relevant to what I have been writing about here. A group reported a pilot of 90 people, split into three: slow breathing through the left nostril only, through the right nostril only, and normal slow breathing as a control, six seconds in and six seconds out for ten minutes. In the left-nostril group, heart rate variability fell by about 27%, with sympathetic indices rising. The right-nostril group showed no heart rate variability effect, but did show a significant fall in both systolic and diastolic blood pressure. The control group did nothing in particular.

If that holds, it is backwards from the tradition. The left nostril is chandra, the lunar channel, the cooling and quietening one — the one prescribed for gentle work. A pilot that finds it raising sympathetic markers is not a small discrepancy. It is also one unpublished pilot, it runs against other published work on single-nostril breathing, and the presenter called it a proof of concept and asked for more trials. I am recording it because I would want to know, not because it settles anything.

The second is a researcher reporting that her own data on Tibetan monastics came out, in her words, confusing: the monks scored worse on a standard emotion-regulation questionnaire than ordinary people, with more negative and fewer positive emotions. Her reading is that the instrument is the problem rather than the monks — that a questionnaire built on Western assumptions about what good emotion regulation looks like may be measuring the wrong construct in a tradition that emphasises preventing an emotion from arising rather than managing it once it has. She is now building and validating a new instrument from the monks’ own definitions.

I have no way to check either of these. I am telling you that explicitly rather than smoothing it over.

What I take from this

None of this says meditation does not work. The best meta-analysis of the field, by Goyal and colleagues in JAMA Internal Medicine in 2014, pooled 47 trials and 3,515 participants and found moderate evidence of improvement in anxiety, depression and pain — effect sizes around 0.3 to 0.4, which is modest but real. It also found low or insufficient evidence for positive mood, attention, sleep, eating habits, substance use and weight, and no evidence that meditation beat active treatments like drugs or exercise.

That is a smaller claim than the one in circulation, and it has been the accurate summary for over a decade.

The thing I did not expect to come away with is a kind of respect. Van Dam, van Vugt, Vago and a long list of co-authors wrote a paper in Perspectives on Psychological Science in 2018 called “Mind the Hype,” arguing that the practice had outrun the evidence and that poor method and overclaiming would eventually hurt the people the field was trying to help. What struck me this month is how thoroughly that paper seems to have been absorbed. The caution is now the house style, at least when the researchers are among themselves.

The gap is not between the researchers and the truth. It is between the room and the article you read about the room.

So the practical suggestion is boring and I will make it anyway. When you meet a confident claim about what meditation does to your brain, ask how many people were in the study, whether there was a control group that was also doing something, and whether anyone has repeated it with more people. Those three questions would have caught almost everything I have had to correct on this blog.

And sit anyway. The evidence for modest improvements in anxiety and low mood is real, and none of this requires the brain scans to be true.

Sources

Coronado-Montoya S, Levis AW, Kwakkenbos L, Steele RJ, Turner EH, Thombs BD. Reporting of positive results in randomized controlled trials of mindfulness-based mental health interventions. PLoS ONE (2016), 11(4):e0153220. doi.org
Hölzel BK, Carmody J, Vangel M, Congleton C, Yerramsetti SM, Gard T, Lazar SW. Mindfulness practice leads to increases in regional brain gray matter density. Psychiatry Research: Neuroimaging (2011), 191:36–43. doi.org
Kral TRA, Davis K, Korponay C, Hirshberg MJ, Hoel R, Tello LY, Goldman RI, Rosenkranz MA, Lutz A, Davidson RJ. Absence of structural brain changes from mindfulness-based stress reduction: two combined randomized controlled trials. Science Advances (2022), 8(20):eabk3316. doi.org
Kuyken W, Ball S, Crane C, et al. Effectiveness and cost-effectiveness of universal school-based mindfulness training compared with normal school provision in reducing risk of mental health problems and promoting well-being in adolescence: the MYRIAD cluster randomised controlled trial. Evidence-Based Mental Health (2022), 25:99–109. doi.org
Lewis-Healey E, Kringelbach M, Canales-Johnson A, Laukkonen R. Near-critical brain dynamics track effortlessness during meditation. bioRxiv preprint (2026). biorxiv.org
Goyal M, Singh S, Sibinga EMS, Gould NF, Rowland-Seymour A, Sharma R, Berger Z, Sleicher D, Maron DD, Shihab HM, Ranasinghe PD, Linn S, Saha S, Bass EB, Haythornthwaite JA. Meditation programs for psychological stress and well-being: a systematic review and meta-analysis. JAMA Internal Medicine (2014). doi.org
Van Dam NT, van Vugt MK, Vago DR, Schmalzl L, Saron CD, Olendzki A, Meissner T, et al. Mind the hype: a critical evaluation and prescriptive agenda for research on mindfulness and meditation. Perspectives on Psychological Science (2018), 13(1). doi.org

The Text Names Seven Things to Measure. Four of Them Are Measurements.

2026-10-27T11:53:03+05:30

Verses 145 to 148 of the Śiva Svarodaya set out something I did not expect to find in a tantric manual: a formal measurement scheme. Five elemental phases, eight dimensions, and the instruction that every phase gets a value on every dimension.

I spent a fortnight building this part of the tool and most of that time was spent on one question. The scheme asks you to combine seven observations into a single reading. Three of those seven cannot be checked by anyone, including you. So what does the combined reading mean?

The answer, I think, is that it means less than any one of its parts. That is not a complaint about old texts. It is the same structural problem that clinical trials have been criticised for since the 1990s, and the fix is identical in both cases.

Collage by Aditi. The bright channel and the pale one — which side is open is the first of the four things in this piece you can actually check.

The scheme is better built than its reputation

Strip the cosmology and what verses 145 to 147 specify is a description matrix. Eight dimensions are named in order: the enumeration of the phases, the junctures of the breath, the signs of the breath, their location in the body, their colours, the vital force, their associated tastes, and the characteristics of their movement.

The dimensions are deliberately heterogeneous. Some are temporal, some spatial, some sensory, some physical. And the commitment is total — every phase receives a value on every dimension, not only on the dimensions that happen to suit it.

That commitment is the clever part. It enforces completeness, so no category gets characterised only where the evidence is convenient. It enables comparison, because you can set two phases side by side dimension against dimension. And it surfaces its own failures: a category that cannot be assigned a value on a required dimension is a problem the scheme itself makes visible.

The nearest modern thing I know is the way psychology characterises affective states. Russell’s circumplex model, published in the Journal of Personality and Social Psychology in 1980, argues that affect is best described not as a list of independent feelings but as position in a two-dimensional space of pleasure and arousal, with every state receiving a value on both axes. The Svarodaya is doing the same kind of work with more axes and no statistics.

I want to be clear that this is a structural compliment, not an empirical one. A well-built matrix filled with wrong values is still wrong. But the architecture is sound, and it is sound in a way that makes the contents testable — which is more than most of what gets written about the breath.

Four dimensions you can actually check

Of the seven observable dimensions, four can be checked by anyone with a mirror, a hand and a clock.

Four of the seven dimensions produce a trace another person could inspect. Three exist only in the observer's report. The eighth item in the scheme is the enumeration of the phases itself, not an observation.

Which nostril is open is verse 153, and it is the only external instrument named in the whole treatise. Breathe onto a cool mirror held a few inches below the nose, and two patches of condensation form. The physics is ordinary: exhaled air is saturated with water vapour at roughly body temperature and condenses on a cooler surface, and the patch it leaves reflects the geometry of the jet that made it. The larger patch marks the more patent nostril.

The reach of the exhalation is verse 158, and it is the most interesting line in this section. Hold the back of the hand in front of the nostrils and move it away until you can no longer feel the breath. Note the distance. That is the only quantitative protocol in the entire text, and what it produces is a crude index of expiratory flow, obtained with no equipment at all.

The direction of the jet is verse 155 — centre, downward, upward, oblique. The junctures of the breath is verse 146, which amounts to rate and pause length, and is simply countable.

Three dimensions that exist only in the report

Location in the body, taste, and the colours seen under ṣaṇmukhī are different in kind. Nobody else can check any of them, and neither can you, in the sense that there is no second reading to compare yours against.

Verse 156 assigns each phase a position: fire at the shoulders, air at the base of the navel, earth at the knees, water at the feet, space in the head. There is no physiological reading I can defend. The locations do not map onto autonomic territories or any known pattern of referred sensation, and the ordering looks like a simple vertical logic — heaviest lowest, subtlest highest — with fire at the shoulders as an anomaly, probably because heat is associated with the upper body. It is schematic ordering rather than observation.

Verse 157 assigns tastes, and is more interesting than it first looks, because the tastes named are the standard rasa categories of Āyurvedic pharmacology. Their appearance here tells you the Svarodaya is drawing on the medical rather than the ritual side of its inheritance. As a diagnostic it is untested. As a thing to notice it has something going for it: resting oral sensation does shift with autonomic state. Frederiksen and colleagues, writing in Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology in 2024, measured unstimulated salivary flow in forty healthy adults and found it dropped significantly during a mental arithmetic stressor compared with a non-stressful speaking task. That is one crossover study in forty people, so I would not call dry mouth a reliable index of anything. I would call it a real signal worth writing down.

The colours are verses 151 and 152, seen inside ṣaṇmukhī mudrā, with the fingers closing ears, eyes, nostrils and mouth. Something does appear. Reducing patterned visual input reliably produces visual phenomena in healthy people: Merabet and colleagues blindfolded thirteen sighted volunteers for five days and reported in the Journal of Neuro-Ophthalmology in 2004 that ten of them experienced visual hallucinations, from bright points of light up to faces and landscapes, with full insight that none of it was real.

I should be honest about the gap there. That study is ninety-six hours of total visual deprivation. Ṣaṇmukhī is three minutes with your fingers on your eyelids. The mechanism is plausibly the same family and the doses are nowhere near each other, so the study tells you the phenomenon is real in principle, not that the specific colours of verse 152 are what three minutes produces. Nobody has run that experiment.

The flaw is not the soft three

Here is the part I kept circling back to. Three unverifiable dimensions in a seven-dimension scheme is not, by itself, a fatal problem. Plenty of good instruments include self-report. The problem is what the scheme does next: it asks you to merge all seven into one elemental verdict.

That is a composite outcome, and composite outcomes built from components of unequal quality are a well-documented way to mislead yourself.

Cordoba, Schwartz, Woloshin, Bae and Gøtzsche reviewed this for the BMJ in 2010. They took forty randomised trials published in 2008 that used a binary composite as their primary outcome, and had blinded observers judge whether the components were of comparable clinical importance. The results are worth sitting with.

Cordoba and colleagues, BMJ 2010. In 20 of the 28 mismatched trials, death was pooled with hospital admission. In 11 of the 16 trials with a significant composite, the abstract implied the benefit extended to the most important component.

Components were judged not of similar importance in 28 of the 40 trials. In 20 of those, death was pooled with hospital admission — as though the two were interchangeable events. The composite’s own definition changed between abstract, methods and results in 13 trials. Only one trial gave a good rationale for its choice of components. And in 11 of the 16 trials where the composite reached significance, the abstract’s conclusion implied the benefit applied to the most important component, which the data did not show.

The mechanism is simple enough to state in a sentence. When you pool a strong component with a weak one, a result driven entirely by the weak component reads as a result about the strong one. The good items lend their credibility to the bad.

That is exactly what a merged elemental reading does. If your composite says “fire” and the composite was driven by a taste you reported, the reading borrows authority from the mirror patch and the counted breath rate, neither of which contributed. You cannot tell afterwards which dimension decided it, because the scheme never asked you to record them separately.

What disaggregation gets you

The fix in trials is to report components separately as well as pooled. The fix here is the same, and the Svarodaya does not do it. That is my judgement about the text, not something the text says about itself, and I want to be careful about the difference. I have described this before as the text warning against the move. Reading it again, I do not think that is right. The text sets out the matrix and treats the combined reading as the product. The discipline of keeping verifiable and unverifiable dimensions apart is something I am importing.

Imported or not, it is what the tool does. The four measurable dimensions score. The three reported ones are recorded, displayed, and marked “not scored.”

The reason this is worth the extra interface is that it turns a dead end into a question. If the self-reported dimensions turn out to track the measured ones over a few weeks of records, that is a finding, and an interesting one. If they do not, that is a more important finding — and a merged instrument conceals it permanently, because there is no separate column to compare.

Merged reading	Disaggregated record
One verdict per observation	Seven values per observation
Cannot say which dimension decided it	Can say exactly which decided it
Soft dimensions borrow hard credibility	Each dimension carries its own weight
Agreement between dimensions is assumed	Agreement is measurable
Nothing to compare next month	A series per dimension

There is a second discipline the mirror test needs, and it is the one I expect people to skip.

Verse 154 says to read the elemental phase from the shape of the condensation patch — square for earth, crescent for water, triangle for fire, circle for air, scattered points for space. I have left that out of the tool entirely, and the reason is not that the shapes are ancient. It is that a condensation patch is an ambiguous stimulus, and the person classifying it already knows which answer the calculation expects.

The size of that effect is measurable. Hróbjartsson and colleagues, in CMAJ in 2013, found 16 randomised trials in which the same outcomes had been assessed by both blinded and non-blinded assessors — 2,854 patients in total, so the comparison is within-trial and the only thing differing is the assessor’s knowledge. The non-blinded assessors produced more optimistic estimates, exaggerating the blinded effect size by 68%, with a confidence interval running from 14% to 230%.

These were trained clinical assessors rating defined outcomes. A practitioner squinting at a patch of fog on a mirror, hoping for a triangle, is in a considerably weaker position.

So if you want to test the shape assignments, there is one protocol that carries information: produce the patch, photograph it, and classify the photograph later without knowing what the breathing state was at the time. Classification made in ignorance of the expected answer is the only classification worth having. I would read that study with real interest. I am not going to build an interface that invites people to do the unblinded version.

The four measurable ones are noisier than they look

Having argued for the measurable four, I should say how far I would trust them, which is not very far.

Take the mirror. The physics is sound and the patch is a real trace, but as far as I can find, nobody has validated mirror condensation against rhinomanometry or acoustic rhinometry. It is a plausible measurement, not a validated one.

What has been tested is the thing the mirror is meant to replace: your own sense of which side is blocked. Chin, Malek, Pratt, Marcells, Sacks and Harvey measured 145 patients by anterior rhinomanometry and compared the result with what each patient said, reporting in the Journal of Laryngology and Otology in 2014. Sensitivity was 86.9% and specificity 41.1%. The positive predictive value was between 54% and 59% depending on the threshold used.

Read that carefully, because it cuts both ways. People are reasonably good at noticing when a side is genuinely obstructed. They are poor at not reporting obstruction when the sides are objectively symmetrical — and in that study 31% of patients were symmetrical. If you ask someone which nostril is dominant, they will usually give you an answer, and when there is no real difference the answer is close to a coin toss.

That is an argument for the mirror, not against it. It is also an argument against the interoceptive certainty that swara yoga tends to cultivate.

The reach of the exhalation has the same shape of problem one level down. Nobody has validated hand-feel distance against a flow meter either, and the instrumented version of the measurement is itself noisy. Hoang and Ho measured peak nasal inspiratory flow in 300 healthy Vietnamese adults and published normal values in Tạp chí Y Dược Huế in 2025: 158.8 ± 41.0 L/min in men and 113.4 ± 31.9 in women. A standard deviation of about a quarter of the mean, in a healthy population, with age and height both significant predictors. They also found the third of three attempts gave the highest average, significantly higher than the first and second, which is a learning effect in a measurement that takes one breath.

If a calibrated meter behaves like that, a hand in the air will behave worse. The reach is a real variable and I would record it. I would not read much into a single morning’s value, and I would not compare my number with yours.

What I kept

The tool scores the four measurable dimensions, records the three reported ones without scoring them, and does not read shapes off the mirror at all.

What I am after is not a better oracle. It is a record that could disappoint me. Seven columns, filled in the same way each morning, each with a fixed criterion, kept for long enough that a pattern would have to show itself rather than be found. Most self-tracking fails not because the wrong variables were chosen but because the variables shifted — recorded when convenient, on dimensions that drifted, with the criteria for each rating never pinned down.

The Svarodaya already solved that part. It fixed the dimensions, fixed their order, and demanded a value on each. Nine hundred years later, the thing I had to add was the discipline of keeping the checkable columns apart from the ones only I can see.

That is a smaller claim than the text makes. It is the one I can defend.

Sources

Cordoba G, Schwartz L, Woloshin S, Bae H, Gøtzsche PC. Definition, reporting, and interpretation of composite outcomes in clinical trials: systematic review. BMJ (2010), 341:c3920. doi.org
Hróbjartsson A, Thomsen ASS, Emanuelsson F, Tendal B, Hilden J, Boutron I, Ravaud P, Brorson S. Observer bias in randomized clinical trials with measurement scale outcomes: a systematic review of trials with both blinded and nonblinded assessors. CMAJ (2013), 185(4):E201–E211. doi.org
Chin D, Malek J, Pratt E, Marcells G, Sacks R, Harvey RJ. Patient self-assessment in discriminating the more obstructed side in nasal breathing. The Journal of Laryngology and Otology (2014), 128(Suppl S1):S34–S39. doi.org
Hoang PM, Ho DA. Peak nasal inspiratory flow: normal values in a healthy Vietnamese adult population. Tạp chí Y Dược Huế (2025), 15(6):56–59. doi.org
Merabet LB, Pascual-Leone A and colleagues. Visual hallucinations during prolonged blindfolding in sighted subjects. Journal of Neuro-Ophthalmology (2004). doi.org
Frederiksen EH, Rojas Ramirez MV, Moreno-Hay I, Miller CS, Carlson CR. Whole unstimulated salivary flow rate decreases during acute stressful condition. Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology (2024), 137(6):594–603. doi.org
Russell JA. A circumplex model of affect. Journal of Personality and Social Psychology (1980), 39(6):1161–1178. PDF

Did Your Brain Create Consciousness, or Does Consciousness Create Your Brain?

2026-10-19T16:05:09+05:30

There is an argument in the non-dual Śaiva tradition that I keep coming back to, and it goes roughly like this.

You try to understand consciousness as though it were a lamp lit by the movement of matter. But who is it that knows both the lamp and the darkness? Before any thought arises, before any perception appears, there is that which knows — and the knower is not produced by what it knows.

It is a good argument. It is also, in its usual form, completely untestable, and I want to be plain about that from the start rather than pretend otherwise at the end.

In brief

The tradition is not claiming that brains are unreal or that neuroscience is wrong. It is making a claim about the direction of explanation: that consciousness is what is fundamental, and the brain is one of the forms it takes, rather than the machine that manufactures it.

Neuroscience has not refuted that. But neither does the state of neuroscience support it — and the second half of that sentence is the one I see dropped most often, including by people I agree with.

The argument, as the tradition makes it

Four moves, compressed. I have written about the philosophy at more length in Recognition as Liberation.

Consciousness, cit, is held to be self-luminous — prakāśa. It needs no second light to reveal it, because it is that by which everything else is revealed. You never observe your own awareness the way you observe a cup; you are the observing.

To that is added vimarśa: awareness not only shines but knows that it shines. On this account, were awareness incapable of recognising itself, nothing could become a lived experience at all. It would be processing with nobody home.

What is called an individual mind is, on this account, consciousness accepting limitation. Māyā here does not mean illusion in the sense of a trick. It means contraction — the infinite experiencing itself as finite. The universe is not a thing standing outside consciousness; it is consciousness in its own creative movement, which the tradition calls spanda, a pulsation.

And so liberation is not an acquisition. Pratyabhijñā means recognition: the discovery that the witness of all experience was never bound in the first place. Contemplative practice does not manufacture awareness. On this view it thins the veils over something already present.

Whatever else you think of it, notice that this is a coherent position rather than a vague one. It says something specific, and it says it in a way that has consequences.

Do not mistake the lute for the music

The tradition’s objection to the neuroscientific account is not that the measurements are wrong. It is that they describe an instrument.

Researchers have mapped the body and the brain with real precision. They have found that when large numbers of neural processes come into particular relations, experience becomes reportable, clear, available to thought. Those are good observations and I do not dispute them.

The claim is that they describe the changing reflections on a mirror rather than the mirror. The two sides are asking different questions. Neuroscience asks how the brain produces consciousness. The Trika asks how consciousness appears as the brain. And here is the uncomfortable part: the same correlational data is compatible with both.

A correlation between brain state and experience is predicted equally well by "the brain makes it" and by "it appears as the brain". Finding the correlation is not finding the answer.

This is not a mystical point and it is not original to me. It is roughly what David Chalmers named the hard problem in the Journal of Consciousness Studies in 1995: you can explain every function — discrimination, integration, reportability, the control of behaviour — and still have asked nothing about why any of it is accompanied by experience. The functional story can be completed without touching the question.

What the brain studies actually show

Here I have to be careful, because the version of this argument I was handed overstates its own evidence, and I would rather correct it than repeat it.

The claim usually made is that during deep contemplative states, neuroscientists see networks becoming more coherent, habitual self-referential patterns falling silent, and attention acquiring extraordinary stability. The honest version is thinner.

The best-known study is Brewer and colleagues, in PNAS in 2011. Experienced meditators showed less activation than controls in the posterior cingulate cortex, a hub of the default mode network, across three different meditation styles, and stronger coupling between that hub and regions associated with cognitive control. That is a real and interesting result. It is also twelve meditators against twelve controls. The authors say themselves that the sample is small, that the whole-brain results need replication, and that the design cannot show that meditation produced the difference rather than that people who differ take up meditation.

On attention, the picture is messier still. Ehmann and colleagues reviewed the long-term meditator literature in NeuroImage in 2025 and found improvements reported across attentional domains — but mixed, with alertness and response inhibition especially inconsistent, most designs cross-sectional, samples sometimes as small as six or eight, self-selection into retreats uncontrolled, and the whole review resting on eighteen studies. Their own word for the findings is “preliminary”.

So “extraordinary stability of attention” is not something the literature has established. Something is probably there. Its size and its cause are both open.

The state of the science is worse than you think

If you want to argue that neuroscience has not explained consciousness, you do not need philosophy. You can simply read what the field says about itself.

In 2025 the Cogitate Consortium published the result of a seven-year adversarial collaboration in Nature: 256 participants across seven laboratories, using fMRI, MEG and intracranial EEG, with every hypothesis and analysis preregistered and all parties agreeing in advance to accept the outcome. It was designed to put the two leading theories of consciousness — integrated information theory and global neuronal workspace theory — against each other properly.

Neither theory survived intact. The collaboration was explicitly not designed to crown a winner, and it did not produce one.

Neither theory came through. The posterior synchronisation that integrated information theory predicted was not found. Global workspace theory did better in places and failed in others, with the predicted ignition at the end of a conscious episode not confirmed.

There is a second finding I find even more striking. Yaron, Melloni, Pitts and Mudrik built a database of 412 consciousness experiments for Nature Human Behaviour in 2022, and reported that whether a study came out supporting a given theory could be predicted from its methodological choices alone, irrespective of the findings. Most studies, they note, interpreted results after the fact rather than testing a theory’s critical predictions in advance.

That is a field discovering that its experiments substantially return whatever was put into them. Readers of what I wrote last week will recognise the shape of the problem.

Why none of that helps the tradition

Now the part I think matters most, and the part the version I was given does not say.

None of the above is evidence for the Śaiva position. Not a little bit of evidence. None.

“Neuroscience cannot currently explain consciousness” and “consciousness is therefore fundamental” are separated by a gap that no amount of difficulty on the first side will close. A failing theory does not transfer its credibility to whichever rival is standing nearby. If it did, every unsolved problem in science would be an argument for everybody’s favourite metaphysics at once, which is obviously absurd.

And the Trika claim has a harder problem than lack of support: in its usual formulation it does not forbid any observation. Whatever neuroscience finds — a tidy neural correlate, a messy one, none at all — can be described as consciousness appearing as the brain. A claim compatible with every possible result is not being confirmed by the results it is compatible with.

I do not say this to dismiss it. Some genuinely important claims are not empirical, and treating them as failed science is its own category error. But it does mean the tradition cannot have it both ways. It cannot be above testing when the evidence is awkward and vindicated by evidence when a study looks friendly.

What I keep

I keep the question, which I think is a real one and is not answered by anybody at present.

I keep the observation that self-awareness is strange in a way the functional accounts do not dissolve. The fact that the two leading theories both stumbled on a careful, preregistered test is not proof of anything metaphysical, but it is a reason not to accept confident popular claims that the matter is basically settled.

And I keep the discipline of separating the parts. The claim that consciousness is self-luminous is philosophy. The claim that experienced meditators show reduced posterior cingulate activation is a finding about twelve people, in need of replication. The claim that realisation stabilises attention extraordinarily is, as it stands, not established. Three different kinds of statement, and the quickest way to ruin all three is to let them lend each other credibility they have not earned.

What I will not do is use the difficulties of consciousness science as a back door for a conclusion I happen to like. If the Trika view is true, it is not true because neuroscience is having a hard decade.

Sources

Chalmers D. Facing up to the problem of consciousness. Journal of Consciousness Studies (1995), 2(3):200–219.
Brewer JA, Worhunsky PD, Gray JR, Tang YY, Weber J, Kober H. Meditation experience is associated with differences in default mode network activity and connectivity. PNAS (2011), 108(50):20254–20259. PNAS
Ehmann S, Sezer I, Keller AS, Treves IN, Sacchet MD. Attention and meditative development: a review and synthesis of long-term meditators. NeuroImage (2025), 323:121602. doi.org
Cogitate Consortium (Ferrante O and colleagues). Adversarial testing of global neuronal workspace and integrated information theories of consciousness. Nature (2025). nature.com
Yaron I, Melloni L, Pitts M, Mudrik L. The ConTraSt database for analysing and comparing empirical studies of consciousness theories. Nature Human Behaviour (2022), 6:593–604. nature.com

What I Left Out of the Swar Yoga Tool, and Why

2026-10-19T15:48:03+05:30

I have spent the last few weeks building a tool from the Shiva Svarodaya, a tantric manual on which nostril you are breathing through. Most of that work was the dull kind: indexing verses, computing sunrise, getting the lunar day right.

The decisions I keep thinking about are the other ones. Four things the text teaches are not in the tool. I did not leave them out because they are old, or because they come wrapped in cosmology. I left them out because building each one would have required me to assert something I cannot support — and in two cases, something that could hurt someone.

This is a post about those four. It is probably the most honest thing I can show you about how the tool was made.

Painting by Aditi. The halo is iconography rather than anything anyone measured — which is a distinction this piece keeps returning to.

The four, before the detail

What the text teaches	What the tool does	Why
Forceful retention with abdominal and pelvic pressure	Names it, does not teach it	A web page cannot supervise, and retention measurably moves cerebral blood flow
Pressure on the eyeballs during ṣaṇmukhī	Teaches the practice with the eye pressure removed	Nobody has tested it, and the eye is a poor place to find out
Reading an element from the shape of a condensation patch	Not implemented at all	The patch is an ambiguous stimulus and the four shapes are imported from iconography
Verse 64: refrain from acting when observation contradicts expectation	Displays it, never acts on it	The rule quietly removes the cases that would test the scheme

The first two are about the body. The second two are about evidence. They are different kinds of refusal and I want to keep them apart.

One: the retention I will not teach

The text is specific about forceful retention, and specific in a way that should give you pause: hold the breath, and apply pressure through the abdomen and the pelvic floor while you do it.

Close the glottis and squeeze against it, and you have performed a Valsalva manoeuvre. Pstras and colleagues describe the physiology of it in Acta Physiologica (2016): intrathoracic pressure rises, venous return to the heart falls, and blood pressure runs through a characteristic sequence of phases, with an overshoot on release. This is ordinary, well-mapped physiology. It is also why people are told not to strain against a closed airway if they have certain heart or eye conditions.

I want to be careful about the step I am taking here, because it is the kind of step this blog exists to catch. Nobody has put a pressure line into someone performing this particular practice with these particular locks and published the phases. That retention with abdominal and pelvic pressure reproduces Valsalva haemodynamics is a mechanical inference, not a measured result. I think it is a sound inference. It is still an inference.

What has been measured is narrower and more interesting. Nivethitha and colleagues, in the Journal of Neurosciences in Rural Practice (2016), put transcranial Doppler on fifteen healthy male practitioners and watched the middle cerebral artery during one minute of bhastrika and one minute of breath-holding. The two did almost opposite things.

Forceful breathing lowered mean flow velocity. A minute of holding raised it about twice as far in the other direction, with most of the change arriving between thirty and sixty seconds.

Note what that study does not tell you. It did not measure blood pressure. It did not measure carbon dioxide. The authors say so plainly, and they describe their own explanation — that holding the breath raises CO₂ and lowers oxygen — as a hypothesis they could not confirm. Fifteen trained men is a small, selected sample. None of this says retention is dangerous. It says retention is not inert, and that the body goes somewhere while you do it.

On actual harm, the evidence is thinner than people on either side of this argument tend to admit. Cramer, Krucoff and Dobos reviewed every published case report and case series they could find in PLoS ONE (2013): 35 case reports and 2 case series, 76 cases in total. Breathing practices were the single most frequently implicated practice, which sounds alarming until you see the number — four cases, three of them involving forceful techniques. One of those was a pneumothorax in a man practising kapālabhāti, reported by Johnson and Tierney in CHEST (2004).

Here is a claim I had been making, and have stopped making. I had been saying that adverse events are “not rare enough to ignore.” I cannot support that. Cramer and colleagues are explicit that case reports cannot be used to estimate how often anything happens, because there is no denominator — no count of the people who practised and were fine. The honest statement is that nobody knows the rate, and that case reports are the weakest design for finding out. What they establish is that the injury is possible, not that it is common.

So my reason for leaving retention out is not that I have evidence it will hurt you. It is narrower. The practice has a plausible mechanism for harm, a measurable physiological effect, a handful of documented injuries, and no way for me to see your heart condition, your blood pressure or your face through a web page. The tradition’s answer to that was a teacher in the room. I think that was risk management rather than gatekeeping. A static page is not a teacher in the room, so the tool names the retention practices, explains what they are, and does not walk you through one.

Two: the eye pressure I took out

Ṣaṇmukhī is in the tool. The instruction to press on your eyeballs is not.

I will be straightforward: I could not find a study of digital pressure on the eye during this practice. Not a good one, not a bad one. As far as I can tell nobody has measured it.

The nearest relevant evidence is about something else. Jasien, Jonas, de Moraes and Ritch measured intraocular pressure during four common yoga postures in PLoS ONE (2015), with ten people with open-angle glaucoma and ten without. In downward dog, pressure went from about 17 mmHg to about 28. In a standing forward bend, 17 to 27. The rise appeared within a minute of taking the position and came back down within about two minutes of sitting up. The glaucoma and non-glaucoma eyes behaved much the same.

That study is not about pressing on your eyes, and I am not going to pretend it is. What it shows is a general property: intraocular pressure is mobile, it moves a long way on ordinary postural changes, and it moves fast. The authors are careful themselves — they say their results neither warn glaucoma patients off these poses nor rule out harm, and they call for the work that would actually settle it.

Which leaves me with an absence of evidence rather than evidence of harm. Normally that is a reason to stay neutral. I did not stay neutral here, for one reason: the eye is not an organ where I am willing to let an untested instruction ride on the assumption that it is probably fine. The practice works without that step. So the tool teaches it without that step, and says why.

Three: the shape I will not read

Breathe onto a mirror and you get two patches of condensation, one under each nostril. Comparing them for size is a crude but real measurement — it is roughly a test of which side is moving more air, and the tool includes it, graded as weak.

The text goes further. It says you can read which element is active from the shape of the patch: square, crescent, triangle, circle. That is not in the tool, and will not be.

Two problems, and the second is the serious one. The first is that those four shapes are yantra forms. They come from iconography, from the diagrams used to represent the elements in ritual, and there is no reason a patch of water vapour on glass should organise itself into them. The categories arrived from somewhere other than the mirror.

The second is that a condensation patch is almost a laboratory-grade ambiguous stimulus. It is irregular, it has soft edges, it changes as you look at it, and it does not strongly resemble anything. Ask someone to sort that into four shapes they have just been told to expect and you are not measuring the patch. You are measuring the expectation.

That is the claim I would like to support with a clean experiment, and here the evidence is weaker than I want it to be. Williams and Blagrove tested a version of it in PLoS ONE (2022): sixty-one people listened to short, degraded audio clips and said whether they heard a voice, after being told either that the study was about ghost voices or about voices in noisy rooms. The priming did not raise overall detection rates — no main effect of group, and no increase in false alarms in white noise. What it did was shift the pattern: primed listeners reported more voices in the purportedly paranormal clips than in the merely degraded ones, while unprimed listeners treated the two the same. The authors describe this as only a partial replication of the original effect, and their sample was small and local.

So I cannot tell you that experiment proves expectation writes the answer. It does not. It is a partial, qualified result, and the general literature here is messier than the confident version you will read elsewhere.

My reason for leaving the shape-reading out does not actually rest on that study. It rests on something simpler. A measurement is only worth having if two careful people would get the same answer from the same patch, and I do not believe they would. One incidental detail in the Williams and Blagrove data makes the point better than their main analysis: when listeners wrote down what they thought the voices said, under 1% of their guesses matched what the original investigators had heard in the same clips. Everyone heard something. Almost nobody heard the same thing.

Four: the rule that cannot be wrong

This is the one I find most interesting, and it is not a safety question at all.

Verse 64 says that when what you observe contradicts what the scheme predicted, you should refrain from acting. Read charitably, that is humility — do not proceed on a confused reading. Read as a method, it is the most effective way I know of to make a claim immune to evidence.

Follow what happens to the cases.

The abstention rule removes exactly the cases that could count against the scheme, so the surviving record agrees with it by construction.

When observation and prediction agree, you act, something happens, and the case is available to be remembered. When they disagree, you do not act, nothing happens, and there is no outcome to remember. The disagreements are precisely the cases that would have told you whether the prediction works, and the rule disposes of them before they can.

There is a second mechanism layered on top. A contrary observation does not get recorded as “the scheme was wrong today.” It gets reinterpreted as an inauspicious condition — the conditions were not right, so the rule did not apply. A claim that absorbs its own counterexamples that way is not a weak claim. It is not a claim at all, in the sense that it no longer forbids any observation.

I want to separate two things that are easy to run together. This is not evidence that the scheme is false. It is the reason I cannot find out either way from the tradition’s own record, however long that record is. A thousand years of satisfied practitioners is not a thousand years of evidence if the dissatisfied cases were never allowed to count.

So the tool shows verse 64, labels it, and never acts on it. If what you observe disagrees with what the calculation expected, the tool tells you they disagree and lets you carry on. That is the only version of this I can defend: record the disagreement rather than explain it away.

What this costs

Leaving things out has a price, and I would rather state it than pretend otherwise.

The tool is less impressive than it could be. A version that read elements off a mirror and told you which hours to avoid would be far more compelling to use, and I expect some people will find what I have built timid — a manual stripped of exactly the parts that made it a manual.

I also cannot claim my refusals are themselves well-evidenced. Two of them rest on absence of evidence rather than evidence of harm, and I have tried to say so each time rather than dressing a judgement call up as a finding. Someone could reasonably draw the line in a different place.

What I am not willing to do is build an instrument whose readings cannot be wrong, or teach a practice I cannot supervise, and then let the tool’s general air of carefulness lend credibility to either. The text itself warns about that move — mixing verifiable and unverifiable items into one composite, so the good items carry the bad. I think it is right about that, and I have tried to apply it to the text more consistently than the text applies it to itself.

The parts I kept are the parts you could check. That is a smaller tool. I think it is the only honest one.

Sources

Pstras and colleagues. The Valsalva manoeuvre: physiology and clinical examples. Acta Physiologica (2016). PubMed 26662857
Nivethitha L, Mooventhan A, Manjunath NK, Bathala L, Sharma VK. Cerebrovascular hemodynamics during pranayama techniques. Journal of Neurosciences in Rural Practice (2016), 8(1):60–63. PubMed 28149083
Cramer H, Krucoff C, Dobos G. Adverse events associated with yoga: a systematic review of published case reports and case series. PLoS ONE (2013), 8(10):e75515. PubMed 24146758
Johnson and Tierney. Kapalabhati pranayama: breath of fire or cause of pneumothorax? A case report. CHEST (2004). PubMed 15136413
Jasien JV, Jonas JB, de Moraes CG, Ritch R. Intraocular pressure rise in subjects with and without glaucoma during four common yoga positions. PLoS ONE (2015), 10(12):e0144505. journals.plos.org
Williams JM, Blagrove M. Paranormal experiences, sensory-processing sensitivity, and the priming of pareidolia. PLoS ONE (2022), 17(9):e0274595. journals.plos.org

How to Measure Meditation

2026-10-18T11:28:16+05:30

A new study asks a narrow, careful question: after a month of OM meditation, does anything measurable change in how the brain handles a demanding task?

The answer is yes, a little, and only in one place. That modesty is what makes it worth writing about. Most of the work in reading a paper like this is not deciding whether to believe it. It is separating what was measured from what the measurement gets taken to mean — which turns out to be the central difficulty in this entire field.

I made a video on this, which covers the same ground more briefly.

The study, in one paragraph

Singh and colleagues, publishing in Applied Psychophysiology and Biofeedback in 2026, took 34 healthy adult men and split them into two groups: 18 practised OM meditation for a month, 16 did not. Before and after, everyone did a visual n-back task at three difficulty levels — 0-back, 1-back and 2-back — while their EEG was recorded. The researchers then looked at five event-related potential components to see whether anything had shifted.

That is a clean design. The question is what came out of it.

What moved, and what did not

Singh and colleagues (2026). Responses got faster at the two easier levels. The N2 shifted at the moderate level only. Accuracy was high everywhere, in both groups, which means the task was not straining anyone to their limit.

Three things are worth holding onto here.

Responses got faster, but only where the task was easy or moderate. At the hardest level, the meditation group was no quicker than the controls.

The brain-level effect is narrower still. It appears in one cell out of six.

And accuracy stayed high across the board. That matters more than it looks, and I will come back to it.

Faster is not the same as more

The headline most people would write from this is that meditation improved working memory. The data do not support that sentence.

Reaction time measures how quickly you produce an answer. Working memory capacity is how much you can hold and manipulate. These come apart routinely. You can get faster because you are more alert, because you have settled into the task, because you have adopted a slightly less cautious threshold for responding — none of which means you are holding more in mind.

If meditation had increased capacity, the obvious place to see it is the 2-back condition, where capacity is actually under pressure. That is precisely where the advantage disappears.

The high accuracy makes this sharper. When nearly everyone is getting nearly everything right, the task is not pushing against the ceiling of anyone’s capacity, so it cannot tell you much about where that ceiling is. Speeding up on a task you were already passing is a real result. It is not a bigger mind.

What an N2 can and cannot tell you

The N2 is a negative deflection in the EEG recorded a couple of hundred milliseconds after a stimulus, strongest over the front and middle of the scalp. It gets described as the brain’s conflict-monitoring signal.

That description is too tidy. Folstein and Van Petten reviewed this component for Psychophysiology in 2008, and the review’s own title gives the game away: cognitive control and mismatch. The N2 is a family of overlapping effects, not a single readout of a single process. What a given N2 shift means depends on the task, where on the scalp it sits, when it occurs, and what the behaviour did alongside it.

So “the N2 changed” is a measurement. “Cognitive control improved” is an interpretation with several steps between it and the measurement, and each step can fail.

There is a second limit worth naming. EEG is superb at when — it resolves events to the millisecond. It is poor at where. Scalp electrodes record the summed activity of large neural populations, and working backwards from the scalp to the sources is a mathematically underdetermined problem with no unique solution. A fronto-central N2 is consistent with medial frontal involvement, including the anterior cingulate. Consistent with is not the same as demonstrated, and scalp EEG on its own cannot close that gap.

One component out of five

This is the part I would most want addressed, and it is the one I nearly missed.

The researchers examined five ERP components — P1, N1, N2, P3 and a late slow wave. One of them produced a reliable effect. The other four did not.

Both readings are legitimate. Which one you should prefer depends on whether the N2 at moderate load was named as the prediction in advance, or found by looking.

I want to be fair about this. A specific, isolated effect is often what a real mechanism looks like — a genuine change in one process should not light up every component. And the researchers used cluster-based permutation testing, which is designed precisely to control for searching across many time points.

But the generous and the sceptical readings are only distinguishable by one thing: whether the N2 under moderate load was the stated hypothesis before the data were collected, or the result that survived a look across the grid. That is what a pre-registration answers, and it is why I now look for one first.

The comparison I would change first

Of everything here, this is the limitation that matters most, and it is not special to this study.

The meditation group was compared against a group that rested. Resting controls for the passage of time and for doing the task twice. It does not control for knowing you are in the meditation group, for expecting to improve, for the structure of showing up five days a week, or for the attention of whoever is running the programme.

Those are not small. They are exactly the ingredients that produce measurable improvement in trials of almost anything.

The field knows this. Van Dam and fourteen colleagues laid it out in Perspectives on Psychological Science in 2018, in a paper that remains the best thing written on why meditation is hard to study. Their figure is striking: only 9 per cent of mindfulness-intervention research had reached the stage of testing against an active control, against 20 per cent compared only with a waiting list or treatment as usual.

And when the comparison is made properly, the picture changes. Goyal and colleagues reviewed 47 randomised trials covering 3,515 people for JAMA Internal Medicine in 2014. Against non-specific controls, meditation programmes produced moderate benefits for anxiety, depression and pain — effect sizes around 0.3 to 0.4. Against specific active treatments — drugs, exercise, other behavioural therapies — they found no evidence that meditation was better.

So the single highest-value change to this study is not more participants. It is a control group that sits down for twenty minutes, five days a week, with someone paying attention to them, and does something that is not OM meditation.

Thirty days is a snapshot

The intervention ran for a month. That is enough to show that something shifted. It is not enough to show that anything lasts.

There were no follow-up measurements. So the results are consistent with a durable adaptation, and equally consistent with a temporary change in alertness or task strategy that fades within a fortnight of stopping. Nothing in the data distinguishes these, and the honest position is that nobody yet knows which it is.

What I would want is the boring, expensive thing: measure again at three months and at six, and measure again after people stop.

Thirty-four men

The sample was 34 healthy adult males — 18 and 16 in the two groups.

For the kind of effect being chased, that is small, and small samples do not just make it harder to find real effects. They also make any effect you do find more likely to be an overestimate, because only the larger fluctuations clear the significance threshold.

The all-male sample is a separate problem. It restricts the conclusions to men, and it rules out exactly the comparisons worth making — whether the effect differs by sex, age, health status, or how much someone had meditated before.

So how do you measure meditation?

Carefully, and with a clear head about what each instrument actually reports.

The reason this is hard is not that meditation is mystical. It is that almost every measurement here is a proxy standing in for something you actually care about, and the gap between proxy and target is where the overclaiming happens. Reaction time stands in for cognitive efficiency. The N2 stands in for cognitive control. A month of practice stands in for a changed mind.

Each of those substitutions is reasonable. Stack three of them and you can travel from “responses were slightly faster at 1-back” to “meditation rewires your brain” without any single step looking unreasonable.

What I take from this paper is not a conclusion about meditation. It is a demonstration of what a modest, well-bounded result looks like before anyone has stretched it: an effect that shows up at moderate difficulty and not at high, in one component out of five, in thirty-four men, over one month, against a group that did nothing.

That is a real finding. It is also almost exactly as small as it sounds, and the authors say so.

The interesting question it leaves is the one I would most like answered: whether meditation changes what you can do, or changes how you allocate what you already have. Those are different claims, they need different experiments, and this study gently points at the second.

The Nasal Cycle, as Physiology Understands It

2026-10-12T11:36:16+05:30

Right now one of your nostrils is probably carrying more air than the other. In a couple of hours it will likely have swapped. This is the nasal cycle, and it is the physiological fact that the whole of swara yoga is built on.

I keep citing it in passing. This article is the version with the numbers in it: what has actually been published, how big the studies were, and how much of the familiar description survives contact with the measurements.

The short answer is that the cycle is real and its mechanism is well understood, but the tidy alternating rhythm everyone draws is a minority finding.

What it is, and who found it

The turbinates — bony shelves inside each nasal passage — are covered in erectile tissue: venous sinusoids that fill and empty like any other erectile tissue in the body. When they fill, the airway narrows. When they drain, it opens. The two sides do not do this in step.

Richard Kayser, a German rhinologist, published the first systematic description in 1895, in a paper on measuring nasal airflow. Clinicians had noticed the phenomenon piecemeal for decades; Kayser measured it.

What he described has been confirmed many times since. What has not held up as well is the shape he and his successors gave it.

The periods people report

Here the literature is a mess, and it is worth seeing why.

The 10-hour axis is compressed after the 6-hour mark. Kahana-Zweig and colleagues' lower bound of 15 minutes was the floor of their analysis window, so the true minimum may be shorter still.

Pendolino and colleagues, reviewing the field for Rhinology Online in 2018, give the range as roughly 30 minutes to 6 hours, citing Gungor and colleagues from 1999.

The most careful single measurement I have found is Kahana-Zweig and colleagues at the Weizmann Institute, who logged airflow in both nostrils of 33 healthy adults for about 24 hours each and published in PLOS ONE in 2016. Their average dominance spell was 2.15 hours — but individual spells ran from 15 minutes to 10 hours 20 minutes. Spells during sleep averaged 4.5 hours, more than twice the waking figure.

So “two to three hours” is not wrong, exactly. It is an average being quoted as though it were a rule, in a distribution wide enough that the average describes rather few of the individual events inside it.

How many people actually have a regular cycle

This is the finding that changed how I write about swara yoga, and it is not obscure — it sits in the standard reviews.

The classical picture is periodicity and reciprocity: a steady rhythm, with the two sides as mirror images, one closing as the other opens. Early observational work reported something like it in up to 80 per cent of people.

Then the quantitative studies arrived.

Hanif, Jawad and Eccles, reviewing the literature for Clinical Otolaryngology in 2000, report that the more careful measurements put true periodicity and reciprocity at between 21 and 39 per cent. Pendolino and colleagues’ 2018 review reports the same band. Gilbert and Rosenwasser had already put it bluntly in 1987: an ideal cycle is barely found.

Kahana-Zweig’s recording study agrees from a different direction. All 33 of their subjects switched dominant side at least once. But only 21 showed a clear rhythm in even one nostril, and only 5 showed one in both. Sometimes congestion rose on both sides at once rather than trading off. The authors concluded that each nostril may oscillate somewhat independently — which, if right, means “the nasal cycle” is a slightly misleading name for the thing.

The neat diagram on the left is the one in almost every article, including some of mine. It describes a minority of people.

The autonomic control is the solid part

If the rhythm is shakier than advertised, the mechanism is firmer. The nasal sinusoids are under autonomic control, and the human evidence for that is unusually direct.

Sympathetic outflow releases noradrenaline, which constricts the sinusoids, drains the tissue and opens the airway. Cut or block that supply and the same side congests. Pendolino’s review catalogues the classic demonstrations: cervical sympathetic transection and stellate ganglion block both alter the cycle on the same side, work going back to Stoksted in the 1950s.

The cleanest modern demonstration comes from spinal cord injury. Gainche and colleagues, in the Journal of Clinical Sleep Medicine in 2016, compared 10 people with tetraplegia against 9 able-bodied controls. Nasal resistance in the tetraplegia group was more than twice as high — 7.0 against 3.0 cm H₂O/L/s. Then they applied a topical sympathomimetic, and resistance fell to 2.3, essentially the control level.

That is about as close to a causal demonstration as human physiology gets without an experiment nobody would approve. Remove the sympathetic signal and the nose congests. Supply the missing chemical and it opens.

Note the sample sizes, though: ten and nine.

Where the whole field is thin

Three things stand out once you start chasing the references, and they are the reason for this article’s subtitle.

The studies are small. The largest careful recording study I found is 33 people. The sympathetic demonstration is ten against nine. For a phenomenon present in every human being and trivially cheap to measure, that is a remarkably thin evidence base.

The studies are old. A great deal of what gets repeated traces back to work from the 1920s to the 1950s — Heetderks, Stoksted, Hasegawa and Kern — in an era with different instruments and different reporting standards. Those findings may well be right. They have mostly not been re-run.

The reviews often omit sample sizes entirely. When I went looking for how many people sat behind each prevalence figure, the reviews frequently did not say. A reader cannot weigh a number whose denominator is missing. Pendolino and colleagues are candid about the state of things: understanding of the nasal cycle, they write, is still very poor, and the reported frequencies for each pattern are often discordant.

What I take from this

The cycle is real. It is autonomically driven, centrally controlled, and readable from outside the body in about five seconds. Nothing here undermines that, and it is a genuinely useful fact.

What does not survive is the picture of a metronome. Your nostrils are not trading off on a reliable two-hour schedule. On the best available measurements, a clear reciprocal rhythm is a minority pattern, the spread of individual spells is about twentyfold, and sleep roughly doubles the period.

For anyone reading the traditional literature, that has a specific consequence. A system that assigns actions to the dominant nostril assumes dominance is a stable, well-behaved state variable. For a minority of people, it may be. For most, the variable is noisier than the system assumes.

That is worth knowing before you build anything on top of it — which, in my case, I already had.

If you want the other side of this, I have written about what the Śiva Svarodaya claims about timing and about which of its claims survive checking.

What Shiva Swarodaya Actually Claims About the Hour

2026-10-12T11:36:12+05:30

Most summaries of swara yoga say something like: the dominant nostril changes every couple of hours. That is vague enough to be unfalsifiable. You could watch yourself for a week and never be able to say whether the claim had failed.

The text itself is not vague. The Śiva Svarodaya counts in a named unit, gives numbers, and divides the period into sub-phases. That specificity is the interesting part, because a claim with numbers in it can be wrong in a way a claim without them cannot.

So here is what the text actually says about the hour. The short version is that it says three different things, and does not reconcile them.

The unit it counts in

A ghaṭikā is one sixtieth of a day and night — twenty-four minutes. Sixty of them make a full nychthemeron. It was measured with a water clock: a copper bowl with a hole in it that filled and sank sixty times between one sunrise and the next.

This matters because every timing claim in the text is expressed in ghaṭikās, and the conversions are where most popular accounts go wrong.

Claim one: five phases inside one flow

प्रथमं वहते वायुर्द्वितीयं च तथानलः। तृतीयं वहते भूमिश्चतुर्थं वरुणो वहेत्॥७१॥ सार्धद्विघटिके पञ्च क्रमेणैवोदयन्ति च। क्रमादेकैकनाड्यां च तत्त्वानां पृथगुद्भवः॥७२॥

prathamaṃ vahate vāyur dvitīyaṃ ca tathānalaḥ | tṛtīyaṃ vahate bhūmiś caturthaṃ varuṇo vahet ||71|| sārdhadvighaṭike pañca krameṇaivodayanti ca | kramād ekaikanāḍyāṃ ca tattvānāṃ pṛthag udbhavaḥ ||72||

First air flows, then fire, third earth, and fourth water. The five arise in sequence within two and a half ghaṭikās, each element arising separately in each channel in turn. — Verses 71–72

Two and a half ghaṭikās is sixty minutes. On the plain reading, five elemental phases arise inside that hour — twelve minutes each — and the hour is the dominance period.

But other passages in the text attach the two and a half ghaṭikās to each element in turn rather than to the set, which stretches the dominance period considerably. Manuscript traditions resolve this differently. The recension I work from does not resolve it at all.

Claim two: twelve changes in a day and night

अहोरात्रस्य मध्ये तु ज्ञेया द्वादश संक्रमाः। वृषकर्कटकन्यालिमृगमीना निशाकरे॥७३॥

ahorātrasya madhye tu jñeyā dvādaśa saṃkramāḥ | vṛṣakarkaṭakanyālimṛgamīnā niśākare ||73||

Within a day and night, know there to be twelve transits. Taurus, Cancer, Virgo, Scorpio, Capricorn and Pisces belong to the moon. — Verse 73

The zodiac here is decoration. It is the standard even-and-odd division of the signs, even ones assigned to the left channel and odd to the right — two existing classifications laid on top of each other and presented as a discovery. There is no physiology in it.

But look past the signs at the number. Twelve transits across twenty-four hours is two hours per phase. That is not astrology. That is a measurement, stated as plainly as the text ever states anything, and it is buried under the part that is worthless.

Three figures, and the text reconciles none

The same recension yields three different dominance periods depending on which passage you follow and how you read it. The measured figure is from Kahana-Zweig and colleagues (2016). Note how wide the real spread is: the argument between 60, 120 and 150 is narrower than the variation between two ordinary people.

This is not a minor discrepancy. On any given morning, the three figures disagree about which nostril should be open. A tool that picks one of them is making a choice the text does not make for it.

Which of the three is closest

The twelve-transit figure, and it is not close.

Kahana-Zweig and colleagues logged airflow in both nostrils of 33 adults for about 24 hours each, and reported an average dominance period of 2.15 hours — roughly 129 minutes. Verses 73–74 say 120. The agreement is better than the text has any right to expect.

That a pre-modern tradition arrived at an approximately two-hourly figure for an autonomic rhythm that Western medicine did not describe until Kayser in 1895 is the substantive fact in this whole section. It survives the removal of the zodiac, the elements and the cosmology.

Two cautions, though, and they are large.

The first is that an average is not a rule. The same study found individual spells running from a quarter of an hour to more than ten. Any single number the tradition settled on would be wrong for most people most of the time.

The second is worse for the text. Two reviews of the rhinology literature — Hanif, Jawad and Eccles in Clinical Otolaryngology in 2000, and Pendolino and colleagues in Rhinology Online in 2018 — both report that only a minority of people show a genuinely regular, reciprocal cycle, with the two sides alternating on one steady rhythm. Older observational work put the figure as high as 80 per cent. The more careful quantitative studies brought it down to between 21 and 39 per cent. Gilbert and Rosenwasser put it bluntly in 1987: an ideal cycle is barely found.

So the text’s two hours is a good estimate of a rhythm that a majority of people do not clearly have.

The moment between

This is the part of the timing material I find most interesting, and almost nobody quotes it.

क्षणं वामे क्षणं दक्षे यदा वहति मारुतः। सुषुम्ना सा च विज्ञेया सर्वकार्यहरा स्मृता॥१२४॥

kṣaṇaṃ vāme kṣaṇaṃ dakṣe yadā vahati mārutaḥ | suṣumnā sā ca vijñeyā sarvakāryaharā smṛtā ||124||

When the breath flows a moment on the left and a moment on the right, know that to be suṣumnā, which is said to carry away all undertakings. — Verse 124

The definition is precise and it is physiologically correct. Suṣumnā is not a third channel with a flow of its own. It is the changeover — the window when the asymmetry passes through a minimum and neither side is stably dominant. That window is real and observable.

The claim attached to it is that action fails during it. As a statement about the world, that is false; the universe does not consult your nose. As a statement about your own performance during an autonomic transition, it is a specific and unexplored hypothesis, and the reasoning behind it is not silly. Transitions between states are periods of regulatory instability by definition, and systems approaching a transition are known to show increased variance and slower recovery from disturbance.

Nobody has tested whether people perform measurably worse on anything during the nasal changeover. It would not be hard to find out.

What would count as evidence either way

This is the question I set out to answer, so let me answer it plainly rather than leave it implied.

Three claims from the text that carry enough numbers to be checked, and the result that would settle each one. Writing the refuting condition down first is the part that makes it a test rather than a search for confirmation.

Each of these needs the same thing from the text, and the text supplies it: a number. “The breath changes every so often” cannot fail. “Twelve transits in a day and night” can.

Why the ambiguity stays in the tool

The Swar Yoga tool offers all three periods in a dropdown, each with its verse, and defaults to the shortest. I thought about hiding the choice and picking one. I decided against it, for a reason worth stating.

Pick one silently and the tool looks authoritative. It also becomes a claim I cannot defend, because the text does not make that choice and I have no evidence that would let me make it for the text. Show all three and the tool is honest about what it is: a reading of a document that disagrees with itself, offered so that your own record can eventually arbitrate between them.

The three figures give different answers on the same day. That is not a flaw to be smoothed over. It is the most useful thing the timing passages have to say, because it tells you exactly where to point a measurement.

The text is specific. Being specific is how it earns the right to be checked — and how it risks being found wrong. Most of what gets written about swara yoga carefully avoids both.

The Shiva Svarodaya: What Holds Up, and the Verse That Does Not

2026-10-12T11:08:02+05:30

For the past few months I have been building a tool around the Śiva Svarodaya, a Sanskrit manual on the breath. You tell it the date and time, it tells you which nostril the text expects to be open, and you record which one actually is.

It was while building the calculation that I ran into a problem. The single verse the whole calculation rests on is the one verse in that section the evidence contradicts. I could have quietly left it out. Instead I want to write about it, because the way that verse fails is more interesting than anything it would have told me if it worked.

Rishikesh, below Ram Jhula.

What the text actually is

The Śiva Svarodaya is a treatise of uncertain date, carried in the Nātha and Śaiva lineages, written as a dialogue in which Śiva instructs Pārvatī. Manuscripts run to roughly 390 to 400 verses. The recension I have been working from holds 313 of them.

What surprised me is how little theology is in it. The bulk of the text is procedural. How to tell which nostril is dominant. How long dominance lasts. What changes when it switches. Which actions go well under which condition, and how to force a switch deliberately.

Strip away the cosmological vocabulary and what is left is a manual of self-measurement. I do not think there is a more detailed one from before the twentieth century.

That is also what makes it worth checking rather than admiring.

What holds up: there really is a rhythm

The text’s foundational claim is that nasal airflow is not symmetrical, that one side dominates, and that dominance alternates on a cycle of a few hours.

This is true, and it was documented in the West by the rhinologist Richard Kayser in 1895. The mechanism is vascular rather than muscular: the turbinates inside the nose contain erectile venous tissue under autonomic control. Sympathetic outflow drains that tissue and opens the airway; parasympathetic dominance engorges it and closes it.

So the relative openness of your two nostrils is a readout of autonomic state that you can check in about five seconds, with nothing but attention. The entire text is an elaboration of that one fact.

But the modern measurements are messier than the tradition suggests — with an important caveat about who was measured, which I come to next. Kahana-Zweig and colleagues at the Weizmann Institute logged airflow in both nostrils of 33 healthy adults for roughly 24 hours each, and published the result in PLOS ONE in 2016.

Kahana-Zweig and colleagues (2016), 33 adults recorded for about 24 hours each. Everyone switched sides. Far fewer did so as a clean, regular oscillation, and the two nostrils often did not behave as mirror images of each other. These were ordinary volunteers, not trained breathers — a distinction the next section turns on.

The average dominance period was 2.15 hours, which sits neatly inside the one-to-three-hour window the text describes. For a document composed without a clock, that is a genuinely impressive piece of observation.

The honest caveat is the rest of the finding. The classical picture — two nostrils trading places on one shared, regular rhythm — fitted only a minority of the sample. Congestion sometimes rose on both sides at once. The authors concluded that each nostril may oscillate somewhat independently.

The objection that the text deserves

There is an obvious reply to all that, and I think it is a fair one.

Those 33 people were ordinary adults. The Śiva Svarodaya is not describing ordinary adults. It describes a practitioner — someone whose breath has been worked on for years. And the mechanism is not far-fetched. The nasal cycle is driven by the autonomic nervous system, and sustained slow breathing demonstrably shifts autonomic balance. It is entirely coherent that a trained practitioner would show the clean, reciprocal rhythm that an untrained sample does not.

That is a real prediction, and it is the most interesting thing in this article: if the tradition is right, experienced practitioners should show a more regular nasal cycle than matched non-practitioners.

Nobody has tested it. I went looking. The studies that recruit experienced practitioners measure what happens during a breathing practice — EEG, heart rate, performance — not whether the spontaneous cycle is more regular across an ordinary day. The 24-hour logging study used untrained volunteers. The comparison that would settle the question, a day of recording in trained practitioners against matched controls, does not appear to have been run.

So the position is not that the text is wrong about the rhythm. It is that the strongest version of the text’s claim has never been put to the test. That is a better place for it than I expected to be able to report, and it is a standing invitation, because this is a cheap study: two nasal cannulae, a day, and two groups.

One discipline is worth keeping if anyone does run it. Say beforehand what result would count against the claim. “They had not mastered it” can absorb any disconfirming data at all, and a claim defended that way quietly stops being a claim about the body and becomes a claim about who counts as a master. Naming the prediction in advance — this many practitioners, this many hours, this much more regular — is what keeps it a claim about noses.

So: the rhythm is real. Whether it is as regular as the text implies is, for the trained practitioner, still an open question.

What holds up: the nose is wired into the brain

This is the finding that made me take the text seriously in the first place.

Until recently, breathing was treated in most of neuroscience as noise — something to be filtered out of a brain scan. Zelano and colleagues at Northwestern changed that in 2016, recording directly from electrodes implanted in patients with epilepsy and publishing in the Journal of Neuroscience.

They found that oscillations in the piriform cortex, the amygdala and the hippocampus lock onto the rhythm of the breath. Crucially, this depended on breathing through the nose. When the patients breathed through the mouth, the effect weakened substantially. Performance followed: recognising fear in a face, and retrieving a memory, both varied with where in the breath cycle the task fell — and only during nasal breathing.

The mechanism is mechanical. Sensory neurons in the nasal lining respond to airflow itself, not only to smells, and the olfactory bulb projects straight into the limbic system without passing through the thalamus first. Nasal breathing delivers a rhythmic pulse directly into the emotional and memory machinery of the brain, once per breath, all day.

That is why a text obsessed with the nose is not as strange as it sounds.

The bridge that does not hold

Now the part where most popular writing about swara yoga goes wrong, and where I had to correct my own notes while building the tool.

The text pairs left-nostril flow (iḍā, lunar) with cooling, receptivity and stillness, and right-nostril flow (piṅgalā, solar) with heat, exertion and movement. In 1983, Werntz, Bickford, Bloom and Shannahoff-Khalsa reported in Human Neurobiology that the nasal cycle was accompanied by alternating EEG dominance in the opposite hemisphere — right nostril open, left hemisphere more active, and the reverse.

It was an electrifying result. It appeared to hand the tradition a modern mechanism.

It has not held up.

The 1983 result and the two more careful tests I could find. Both later studies are small, and the 2025 authors say their own finding needs replicating. But neither supports the claim as it is usually repeated, and the 2025 one points the opposite way.

Telles and colleagues tested it directly in BMC Research Notes in 2017, with thirteen practitioners who practised breathing regularly at a yoga centre in north India. They expected hemispheric symmetry to change. It did not. They said so.

That detail matters, and it is why I treat this claim differently from the one above. The objection that an effect will only appear in trained breathers is a fair challenge to the nasal-cycle data, where the volunteers were untrained. Here it has already been met: these were trained breathers, and the effect still did not appear.

Frohlich, Frohlich and Sklerov ran the best-powered test I could find, in PLOS ONE in 2025: nineteen people, 128-channel EEG, left-, right- and alternate-nostril breathing in random order. There was no lateralisation of power. There was a lateralised connectivity effect, but it ran ipsilaterally — stronger on the same side as the nostril in use, which is the opposite of what the 1983 result described. Heart rate, heart-rate variability and working memory did not differ between conditions at all.

I want to be fair to both studies: thirteen and nineteen people are small numbers, and the 2025 authors are careful to say their own result needs replicating. This is not a decisive refutation. It is the absence of the support the claim is usually said to have.

And there is a deeper problem underneath. The framework the finding gets pressed into — analytic left brain, creative right brain — is itself largely wrong. Nielsen and colleagues looked at resting-state brain connectivity in 1,011 people for PLOS ONE in 2013 and found no evidence that anyone is globally left- or right-brained. Lateralisation is real, but it is local to particular networks, not a personality setting for the whole head.

So even a clean nostril-to-hemisphere link would not deliver what people want from it.

The verse I wanted to work

Here is the one the tool depends on.

शुक्लपक्षे भवेद्वामा कृष्णपक्षे च दक्षिणा। जानीयात्प्रतिपत्पूर्वं योगी तद्यतमानसः॥६५॥

śuklapakṣe bhaved vāmā kṛṣṇapakṣe ca dakṣiṇā | jānīyāt pratipatpūrvaṃ yogī tadyatamānasaḥ ||65||

In the bright fortnight the left flows; in the dark fortnight, the right. The yogin of disciplined mind should know this from the first lunar day onward. — Verse 65

This is a chronobiological claim and it can be assessed as one. It predicts which nostril will be open at a reference time, from the lunar day. It is the only rule in this part of the text that derives a nostril from a date, which is precisely why a calculator needs it.

The evidence does not support it. The nasal cycle’s documented determinants are posture, pressure on one side of the body, exercise, temperature, allergic status, hormonal state and sleep stage — and every one of those is more powerful than any proposed lunar influence. I could not find a controlled study demonstrating the association the verse asserts.

The wider literature on lunar effects is not encouraging either. Cordi and colleagues re-analysed sleep recordings from 1,265 volunteers across 2,097 nights for Current Biology in 2014 and found no reliable association between lunar phase and sleep. Their title names the likely reason earlier studies disagreed: the file drawer problem. Null results do not get published, so the positive ones look more numerous than they are.

I have built the lunar calculation into the tool anyway, with the contradiction stated on the page, because a tool that shows you a prediction and then records what actually happened is more useful than one that quietly drops the prediction it cannot defend. But I want to be plain here: the expected-nostril figure it shows you rests on a verse I do not believe.

A claim about the airway, generated by the word “moon”

So why does this verse appear, stated so confidently, in a text that elsewhere observes carefully?

Because it is not doing the same kind of work as the other verses. It is not reporting an observation. It is importing a framework.

The chain runs like this. The left channel is called candra, lunar. The moon waxes through the bright fortnight. Therefore the left nostril should flow during the bright fortnight. Every step follows from the vocabulary. Not one of them requires anyone to have looked at a nose.

The same text, two kinds of claim. Both are stated in the same confident voice, which is exactly the difficulty.

I think this is the most useful thing the Svarodaya has given me, and it has nothing to do with breathing.

When a model hands you a confident prediction, ask where the prediction came from. Did it come from watching the system? Or did it come from the internal logic of the model’s own vocabulary — from what its words already imply about each other?

Predictions of the second kind are extremely common. They feel identical from the inside. They are usually wrong.

Verse 65 is a clean specimen because the error is visible from outside its framework. I do not think in lunar and solar channels, so I can see the join. The harder question, and the one I keep returning to, is which of my own confident claims are the same shape — generated by a vocabulary I am too close to notice I am using.

What I am keeping

A fair amount, as it turns out.

The observation itself. Check which nostril is dominant. It takes five seconds, costs nothing, and you are reading a real autonomic signal.

The anchor, without the lunar reckoning. The text ties the check to a reference moment. That instinct is right even though its particular anchor is not. Self-tracking fails on remembering, not on design, so attach the check to something unavoidable — waking, your first meal, the end of the working day — rather than to a clock time.

The record, including the misses. This is the part people skip. Write down what you predicted and what happened, and keep the entries where you were wrong. A log of hits only is not evidence of anything.

Nasal breathing rather than mouth breathing. This is the claim here with the clearest mechanism behind it. Though note what Zelano’s work actually shows: that the brain’s rhythm follows nasal airflow, not that breathing through your nose will make you calmer or happier.

The open question, held open. Whether a trained practitioner’s cycle is more regular than an untrained one’s is untested, and worth testing. I would rather say that than either assume it or dismiss it.

What I am not keeping is the claim that any of this balances your hemispheres. On present evidence it does not, the one modern well-instrumented test points the other way, and in the study that did recruit regular practitioners the effect still failed to appear.

What the tradition is actually offering

I want to be careful at this join, because it is where overclaiming usually happens.

The Śiva Svarodaya does not separate description from prescription, or physiology from omen. A verse recording what the breath does sits next to a verse promising what will happen if you act while it is doing it. To the text these are one kind of statement. They are not.

Hold them apart and something unusual survives: a self-administered, zero-cost method for reading your own autonomic state, refined over centuries by people with nothing to measure with but attention. Collapse them and you are left with astrology.

The text cannot tell me which nostril will be open tomorrow morning. It can tell me to go and look. That turns out to be the more valuable instruction, and it is the one I nearly lost while trying to make the other one work.

Does Forgiveness Change Your Brain? What the Evidence Shows

2026-10-10T01:30:00+05:30

The sages said that freedom from hatred frees the mind. Somewhere along the way, that became a claim about neurons: forgive, and you will rewire your brain.

It is a lovely idea, and it is testable. So I went looking for the studies. The short version is that the behavioural evidence is reasonably good and the brain-imaging evidence is thin — and most articles you will read have those two the wrong way round.

On the Ganga at Rishikesh.

What forgiveness actually is

Forgiveness, as researchers define it, is a reduction in resentment, hostility and the desire for revenge towards someone who has hurt you. That is all it is.

It does not mean the act was acceptable. It does not require reconciliation. It does not require trust. And it is not the same as forgetting, which is the confusion I meet most often.

Forgiveness	Forgetting
Changes your relationship to the injury	Weakens your access to the memory
Works best while you remember clearly	Is not needed for healing
Sits comfortably alongside firm boundaries	Offers no protection at all
Does not require reconciliation	Tells you nothing about who is safe

You can forgive someone completely and still decide never to be alone with them again. Keeping your distance is sometimes the wise response, and nothing in this research says otherwise.

Does practising it actually help?

This is the part that holds up.

Akhtar and Barlow reviewed the randomised controlled trials of forgiveness therapy for Trauma, Violence, & Abuse in 2016. They found fifteen trials and pooled twelve of them. Compared with people who received nothing, people who completed a forgiveness programme showed measurable improvements.

Pooled effects from twelve randomised trials (Akhtar and Barlow, 2016). Anxiety is left off deliberately: the pooled estimate looked large but was not statistically significant and the trials disagreed wildly with one another.

For context, a standardised mean difference of 0.5 is conventionally read as a moderate effect. Reduced anger came out at 0.49 across six trials and 517 people, and lower depression at 0.37 across six trials and 415 people. These are real, useful changes.

Two honest caveats. First, every one of these trials was judged at high risk of bias for blinding, which is close to unavoidable when the treatment is a course you obviously know you are attending. Second, the comparison was mostly against receiving nothing at all. Some of this benefit is the ordinary effect of spending structured time on a problem with someone’s attention on you, which is not nothing, but it is not specific to forgiveness either.

The anxiety result is worth dwelling on, because it shows what honest reporting looks like. The pooled number was the largest of the lot. It was also non-significant, drawn from three small trials that disagreed sharply. A less careful summary would have reported the big number and stopped.

The brain part, where the story thins out

Here is what I expected to find: a body of imaging work showing what forgiveness does to the brain. Here is what exists.

The most cited study is Ricciardi and colleagues, in Frontiers in Human Neuroscience in 2013. Participants imagined scenarios in which they were hurt, and either forgave or did not. Forgiveness was associated with activity in the left dorsolateral prefrontal cortex, the right inferior parietal lobule and parts of the temporal lobe — broadly, regions involved in reappraisal and in thinking about other minds. That is a coherent result.

It had ten participants.

It gets more interesting. The authors expected to see the anterior cingulate cortex light up, because that region is involved in emotional conflict and distress. It did not reach significance. They say so plainly, and suggest their study was simply too small to detect it.

I mention this because the anterior cingulate appears confidently in almost every popular article on the neuroscience of forgiveness, including drafts I have written myself. The main study people cite for it looked, and did not find it.

So when you read that forgiveness “rewires your brain”, understand what sits underneath: a small number of studies, with around ten to twenty people each, asking participants to imagine forgiving while lying in a scanner. Nobody has shown that a course of forgiveness therapy produces lasting structural change. There is no forgiveness centre. There probably is not one to find.

Why carrying it around does cost you something

The strongest mechanism is not about forgiveness at all. It is about rumination — the involuntary replaying of an injustice.

Michl and colleagues followed two large samples in the Journal of Abnormal Psychology in 2013: just over a thousand adolescents across seven months, and just over eleven hundred adults across a year. Stressful life events predicted later increases in rumination, and rumination in turn predicted later anxiety symptoms in both groups, and depression symptoms in the adults.

That is longitudinal evidence, which is stronger than the usual snapshot correlation, though it is still not experimental proof that rumination causes the symptoms.

It does suggest the useful distinction. Remembering an injury is not the same as replaying it. You can hold the memory clearly, learn what it taught you, and still loosen its grip on your attention. Rumination is the part worth targeting, and it is plausibly what forgiveness programmes are actually working on.

Forgiveness has a shape, and it is not a switch

The model most of the research is built on comes from Robert Enright, who treats forgiveness as a process with four phases rather than a decision you make once (Enright and Fitzgibbons, 2000). I find this the single most useful thing in the literature, because it explains why “just forgive them” fails as advice. It skips three of the four phases.

Enright's four-phase process model. People move back and forth between phases rather than climbing cleanly.

Two things worth saying about it. People do not move through these cleanly — going backwards for a week is ordinary. And the phase you are in is specific to one injury, not to you as a person. You can be deep in the fourth phase with one person and stuck at the first with someone else.

A five-minute practice

I still think this is worth doing, with the caveats above held in mind. Sit somewhere comfortable. You do not need to contact or confront anyone.

Settle. One minute. Breathe gently and notice what is happening in your body. Do not try to feel calm.

Name what is there. One minute. Say inwardly, “this is anger”, or “this is hurt.”

Separate the event from the replay. One minute. What actually happened? What am I telling myself about it, over and over? What do I need now?

Loosen the demand. One minute. Something like: I do not have to approve of what happened, and I do not have to carry this indefinitely.

Choose a boundary. One minute. Distance, a conversation, support from someone you trust, or simply more time.

One note on the second step, because the research is more interesting than the usual advice. Naming an emotion is often recommended as a universal technique. Levy-Gigi and Shamay-Tsoory tested it in PLOS ONE in 2022 and found that it reduced distress for high-intensity material — but increased distress for mild material. Their advice is to use labelling with caution when the feeling is low-level. That matches something practitioners report and teachers rarely mention: going looking for a small grievance to name can make more of it than was there.

So use that step when the hurt is genuinely large. For a minor irritation, you may do better leaving it alone.

Do not force any of this. If the injury is deep, forgiveness may take months or years, or may not be the right goal for you at all right now. Nothing in the evidence says you are failing if it does not arrive on schedule.

What I keep from the tradition

I want to be careful here, because this is exactly the join where overclaiming happens.

The teaching that one should be free of hatred is a moral and spiritual claim. It is not made true or false by an fMRI scanner, and the studies above do not validate it. What the research offers is narrower and more practical: evidence that structured work on resentment tends to reduce anger and low mood, and evidence that replaying an injury is one of the ways it keeps costing you.

The tradition and the research are asking different questions. The tradition asks what kind of person to become. The research asks what measurably changes if you try. Both are worth having, and the second does not certify the first.

What I would say is this. Forgiveness is not telling yourself you were never wounded. It is the slow discovery that the wound does not have to govern the rest of your attention. That much, at least, the evidence supports.

Where are you with it?

Twelve questions, about two minutes. It places you on the four phases above, using items built around the three motivations the research actually measures — avoidance, revenge and benevolence (McCullough and colleagues, 1998).

Answer about one specific person and one specific hurt. Answering about forgiveness in general produces a meaningless result, for the reason given above: the phase belongs to the injury, not to you.

Not loading? Open it in a new tab.

A caveat I want to put plainly, since the rest of this article has been about overclaiming. This is a reflective tool, not a validated psychometric instrument. The phases are Enright’s and the constructs are drawn from published measures, but the items are mine and the scoring bands have not been tested against anything. It is a structured way to think about where you are. It is not a test, and it does not produce a score that means anything outside this page.

If what surfaces is heavier than you expected — if the hurt is affecting your sleep, your work or your relationships — that is a reason to talk to someone qualified rather than work through it alone.

Recognition as Liberation

2026-09-30T09:00:00+05:30

In brief

This article argues that Abhinavagupta’s non-dualism is best read as a philosophy of recognition rather than a philosophy of negation. Where some Indian non-dual systems treat the plural world as something to be seen through and set aside, the Trika Śaivism of tenth- and eleventh-century Kashmir treats that same world as the self-display of a conscious and free absolute. The study reconstructs four linked ideas: the paired notions of prakāśa (manifesting light) and vimarśa (reflexive self-awareness); the doctrine of svātantrya (sovereign freedom) as the source of manifestation; the account of limitation through the tattvas, kañcukas and malas; and the soteriology of pratyabhijñā, in which liberation is the recognition of an identity that was never lost. A further section examines how Abhinavagupta carried this model into aesthetics through his theory of rasa. The article closes by comparing the Trika position with Śaṅkara’s Advaita Vedānta and by weighing what the tradition can and cannot offer to present-day discussions of consciousness.

Introduction

Any philosophy that claims reality is “one” must eventually explain why experience so stubbornly presents itself as many. We meet trees, other people, our own shifting moods, the passage of time. A non-dualist has broadly two options. The first is to say that plurality is ultimately unreal, a misperception layered over a single featureless ground. The second is to say that plurality is real as an expression of the one ground, so that difference appears without ever amounting to a second, independent reality.

Abhinavagupta (fl. c. 975–1025 CE) took the second road, and he took it with unusual rigour. Working in Kashmir as a philosopher, exegete, ritual theorist and literary critic, he drew together several streams of Śaiva thought into a synthesis usually called Trika or, in its more philosophical register, the Pratyabhijñā (“Recognition”) school. His central claim can be put simply: the absolute, named Śiva, is consciousness (cit), and this consciousness is not inert but free, self-aware and creative. The universe is what that freedom looks like when it expresses itself.

This article pursues three questions. First, what conception of consciousness allows Abhinavagupta to affirm both unity and genuine multiplicity? Second, if everything is already Śiva, what exactly is bondage, and what does liberation change? Third, how does this metaphysics extend into his celebrated theory of aesthetic experience? The discussion relies chiefly on the Śiva Sūtras, Utpaladeva’s Īśvarapratyabhijñākārikā, the Vijñāna Bhairava Tantra, and Abhinavagupta’s own Tantrāloka, Tantrasāra, Īśvarapratyabhijñāvimarśinī and Abhinavabhāratī, read alongside modern scholarship.

Historical and textual context

The non-dual Śaivism of Kashmir did not begin with Abhinavagupta. Its scriptural base lies in a body of Tantras, among them the Mālinīvijayottara, which Abhinavagupta treated as the authoritative root of Trika. In the ninth century, according to tradition, the sage Vasugupta received the Śiva Sūtras, a compact collection of aphorisms on consciousness and liberation. His disciple Kallaṭa is credited with the Spanda Kārikās, which develop the idea of consciousness as a dynamic “pulsation” (spanda).

The decisive philosophical turn came with Somānanda’s Śivadṛṣṭi and, above all, with his student Utpaladeva, whose Īśvarapratyabhijñākārikā gave the tradition a systematic argument. Utpaladeva engaged directly with Buddhist epistemologists such as Dharmakīrti, who denied any enduring self. Against them he argued that memory, synthesis of perceptions and the unity of experience all require a persisting, self-aware subject.

Abhinavagupta stood in the third generation of this lineage, having studied with Utpaladeva’s student Lakṣmaṇagupta. His achievement was twofold. In the Īśvarapratyabhijñāvimarśinī and its longer companion commentary, he refined the Pratyabhijñā arguments. In the Tantrāloka, a vast compendium, and its digest the Tantrasāra, he integrated that philosophy with ritual, yoga and cosmology. His student Kṣemarāja later produced the Pratyabhijñāhṛdaya, a short and widely read primer that popularised many of the formulations discussed below.

Prakāśa and vimarśa: the structure of consciousness

The Trika analysis starts from a modest observation. Whatever we encounter, whether a colour, a melody, a memory or a flash of irritation, shares one feature: it is manifest. It shows up. The tradition names this manifesting quality prakāśa, literally “light” or “shining.” An object that did not appear to any awareness could not even be spoken of, so prakāśa is treated as the condition of possibility for anything at all being present.

Had the analysis stopped there, the result might resemble a pure witness-consciousness, luminous but passive, much like a mirror. Abhinavagupta insists that this picture is incomplete. A mirror reflects objects but does not know that it reflects them. Consciousness, by contrast, is aware of itself as aware. This reflexive grasp is vimarśa, variously rendered as self-reflection, self-apprehension or active awareness.

The pairing matters because vimarśa is what makes consciousness a subject rather than a mere field. It also grounds language, judgement and will, since vimarśa is closely tied to the tradition’s concept of parāvāk, the supreme level of speech. Without vimarśa, Abhinavagupta argues, consciousness would be indistinguishable from an insentient object such as a crystal. The absolute is therefore not a static being but a self-knowing activity. Kṣemarāja captures the point when he describes ultimate reality as a union of light and reflective awareness in which neither can exist without the other.

The Śiva Sūtras compress this into their opening aphorism, caitanyam ātmā, “consciousness is the Self” (ŚS 1.1). The term caitanya here denotes not a passive glow but the full freedom of knowing and acting. The self in question is not the body or the personality. It is the reflexive awareness that knows both.

Svātantrya and ābhāsa: how the world appears

If consciousness is the only reality, the obvious puzzle is how a world of apparently separate things arises. Abhinavagupta’s answer rests on svātantrya, the sovereign freedom of consciousness. Because Śiva is self-aware, Śiva is also free, and freedom in this system means above all the capacity to manifest. The universe is not produced out of some external material, nor does it emerge by accident. Consciousness displays itself, within itself, as the whole range of subjects and objects.

The technical term for such a manifestation is ābhāsa, an “appearance” or “shining forth.” The word can mislead a reader familiar with Advaita Vedānta, where appearance often suggests illusion. In Trika usage, an ābhāsa is real precisely as an expression of consciousness. The pot on the table is not a false image concealing a true Brahman. It is Śiva appearing as a pot. What would be false is the belief that the pot exists on its own, cut off from the awareness in which it shines.

An image the tradition itself favours is the mirror. Reflections in a mirror are many and varied, yet none of them is anything other than the mirror. The difference is that in the Trika case the mirror also produces its own reflections through its own will. The frequently cited ocean-and-wave comparison makes a similar point: waves differ from one another without ever being separate from water.

This model dissolves the usual tension between transcendence and immanence. Śiva exceeds every particular appearance, since no finite form exhausts infinite freedom. Yet Śiva is also wholly present in each appearance, since each is nothing but Śiva’s self-expression. Kṣemarāja expresses this with the phrase that consciousness, of its own free will, unfolds the universe on its own screen.

Contraction: tattvas, kañcukas and malas

A philosophy that makes everything divine must still explain ordinary human limitation. Trika does so through the idea of saṅkoca, self-contraction. The infinite does not become deficient. It freely assumes the appearance of limits, much as a light seen through a narrow opening appears small without the light itself shrinking.

The thirty-six tattvas

The tradition maps this contraction as a sequence of thirty-six tattvas, or principles of reality. The scheme absorbs the twenty-five categories of Sāṃkhya and places above them a set of higher, “pure” principles.

Level	Tattvas	What they describe
Pure order (1–5)	Śiva, Śakti, Sadāśiva, Īśvara, Śuddhavidyā	Consciousness in full self-possession, with a growing sense of “I” and “this” still held in unity
Māyā and its sheaths (6–11)	Māyā, kalā, vidyā, rāga, kāla, niyati	The veiling power that introduces difference and the five limitations of the individual
Subject and nature (12–13)	Puruṣa, Prakṛti	The limited experiencer and the matrix of objects
Inner instrument (14–16)	Buddhi, ahaṃkāra, manas	Intellect, ego-sense and mind
Senses and elements (17–36)	Five cognitive senses, five organs of action, five subtle elements, five gross elements	The field of embodied perception and matter

The list is not a moral ladder from good to bad. It traces how a single consciousness progressively takes on narrower forms, and it can be read in reverse as a map of return.

The five kañcukas

Māyā operates through five “sheaths” (kañcukas), each of which restricts one of Śiva’s universal qualities. Kalā narrows omnipotence into limited agency. Vidyā narrows omniscience into partial knowledge. Rāga turns fullness into a sense of lack that shows up as desire. Kāla subjects the timeless to sequence. Niyati binds the free to fixed causes and places.

The three malas

Alongside the sheaths stand three “impurities” (malas). Āṇava mala is the root sense of being small and incomplete. Māyīya mala is the perception of the world as fundamentally divided. Kārma mala is identification with one’s actions and their results. These terms should not be read as sins in a moral sense. They name structural features of finite experience.

On this reading, the Śiva Sūtras’ second aphorism, jñānaṃ bandhaḥ (ŚS 1.2), becomes clear. It does not condemn knowledge as such. It says that knowledge under contraction, the knowing that says “I am only this and not that,” is what binds.

Pratyabhijñā: liberation as recognition

The school’s name supplies its soteriology. Pratyabhijñā is the ordinary Sanskrit word for recognising someone or something already known. Utpaladeva and Abhinavagupta illustrate it with the case of a woman who has heard of a man’s virtues and longs for him, yet feels nothing when he stands before her, until someone tells her who he is. At that moment nothing new is added to the man. What changes is her grasp of what was already present.

Liberation works the same way. The individual does not become Śiva by acquiring a new substance or climbing out of the world. The individual recognises that the awareness it has always been is Śiva. This is why the tradition can describe the goal as already accomplished and still require a real transformation. The transformation is cognitive and existential, not ontological.

The analysis of the word aham (“I”) is central here. In everyday use, “I” is attached to passing descriptions: tired, clever, wronged, successful. These predicates change constantly, while the sense of being a subject persists through them. Abhinavagupta calls the unrestricted form of this subjectivity pūrṇāhantā, “perfect I-ness.” The limited ego is not an enemy to be destroyed. It is a contracted version of that universal “I,” and liberation consists in the contraction being seen for what it is.

Two consequences follow. First, the world need not be renounced, since the problem was never the existence of objects but the misreading of them as independent. Second, liberation is not a special mental state that comes and goes. Trance, silence and bliss are all states, and states pass. What Trika calls recognition is an abiding understanding of the ground in which every state appears. A verse of the Vijñāna Bhairava Tantra (v. 116) puts the practical implication vividly: wherever the mind goes, outward or inward, the condition of Śiva is found there, because it pervades everything.

Means and grace: upāyas, śaktipāta and the paradox of practice

A doctrine of recognition invites an objection. If one is already Śiva, why practise anything? Abhinavagupta’s reply is that knowing a proposition is not the same as realising it. A scholar may repeat “consciousness is the Self” flawlessly and still live wholly identified with body and circumstance. Practice does not manufacture the goal. It removes whatever obscures recognition.

In the Tantrāloka he arranges practice into graded “means” (upāyas), matched to the ripeness of the practitioner:

Upāya	Sphere of work	Typical methods
Āṇavopāya	The individual’s body, breath and objects	Breath awareness, concentration, visualisation, mantra recitation, ritual
Śāktopāya	Thought and cognition	Refining concepts until they point beyond themselves, contemplative reasoning, subtle mantra
Śāmbhavopāya	Will and pure awareness	Turning attention directly to the source of awareness, with minimal support
Anupāya	No means	Spontaneous recognition, for one already fully ripe

The Vijñāna Bhairava Tantra shows what these means look like in detail. Its 112 contemplations use the pause between breaths, the fading edge of a sound, the open sky, intense joy or fear, and even sneezing or hunger as openings. Its logic is consistent. Ordinary attention is swallowed by the contents of experience, but at moments of transition or intensity that absorption briefly loosens, and the awareness behind it can be noticed. The instruction is not to indulge each impulse. It is to notice the knowing in which the impulse appears.

Above every method stands grace. The five acts of Śiva (pañcakṛtya) are emission, maintenance, withdrawal, concealment and grace (anugraha). Concealment explains why beings forget their nature. Grace, often experienced as śaktipāta, the “descent of power,” explains why they begin to remember. Abhinavagupta does not treat grace and effort as rivals, because both occur within the one freedom. The seeker’s search is itself an expression of the reality being sought.

Aesthetics: rasa and universalisation

Abhinavagupta’s influence reaches far beyond religious philosophy because he carried his model of consciousness into literary theory. In the Abhinavabhāratī, his commentary on Bharata’s Nāṭyaśāstra, and the Locana, his commentary on Ānandavardhana’s Dhvanyāloka, he addresses an old question: what exactly does an audience enjoy when it watches a tragedy?

Earlier critics had proposed that the emotion is located in the original character, or that the actor imitates it, or that the spectator infers it. Building on the work of Bhaṭṭa Nāyaka, Abhinavagupta argues that none of these explains the peculiar quality of aesthetic experience. Grief on stage does not make us want to flee, as real grief would. Instead we savour it.

His explanation is sādhāraṇīkaraṇa, “generalisation” or “universalisation.” Through the conventions of drama and poetry, an emotion is lifted free of its particular owner. The sorrow is neither the character’s alone nor the spectator’s private sorrow. It is sorrow as such, experienced by a mind that has temporarily set aside the anxious question “what does this mean for me?” The resulting relish is rasa.

The link to his metaphysics is direct. In rasa, the grip of the limited ego loosens and consciousness tastes its own content without the usual contraction. Abhinavagupta therefore describes aesthetic rapture as akin to the bliss of recognising the absolute. He is careful not to identify them. Aesthetic delight is temporary and depends on the performance, while liberation is lasting. Yet the resemblance is instructive, and it gives Trika a way to explain why art can feel like a glimpse of something larger than oneself. He also gave special standing to śānta rasa, the rasa of tranquillity, as the one most closely aligned with liberation.

Discussion

Trika and Advaita Vedānta compared

Both Śaṅkara’s Advaita Vedānta and Abhinavagupta’s Trika affirm a single conscious reality, and both locate human bondage in ignorance of it. Their disagreement lies in how they value the world.

Question	Advaita Vedānta (Śaṅkara)	Trika Śaivism (Abhinavagupta)
Nature of the absolute	Brahman as pure, actionless consciousness	Śiva as consciousness endowed with freedom and self-awareness
Status of the world	Neither real nor unreal (anirvacanīya); an appearance due to ignorance	A real manifestation (ābhāsa) of consciousness
Role of māyā	Obscuring power bound up with ignorance	A power of Śiva that Śiva freely wields
Agency	Belongs to the empirical level only	Belongs to the absolute itself
Goal	Knowledge that sublates the world	Recognition that sees the world as Śiva

For the Trika critic, an absolute lacking vimarśa and agency cannot account for why anything appears at all. For the Advaitin, attributing activity to the absolute risks importing change into what must be changeless. The debate is genuine, and neither side can be declared the winner by a simple comparison.

Contemporary relevance

Abhinavagupta’s thought has attracted interest from philosophers of mind and scholars of contemplative practice. His insistence that awareness is reflexive, that consciousness knows itself in knowing anything, has parallels in current debates about pre-reflective self-awareness in phenomenology. His contemplative methods also resonate with attention-based practices used in some therapeutic settings. His aesthetics has found a place in comparative literary theory as an early and sophisticated account of how art depersonalises emotion.

Limits of the analysis

Some caution is needed. Trika was an initiatory tradition embedded in ritual, lineage and specific Tantric scriptures. Presenting it purely as a philosophy of awareness, as many modern popularisations do, strips away much of what its authors thought essential. Popular sources also frequently misattribute verses, for example crediting lines from the Vijñāna Bhairava Tantra to the Spanda Kārikās, or quoting passages of uncertain origin as Utpaladeva’s. Serious study should rely on critical editions and scholarly translations. Finally, the metaphysical claim that the universe is a manifestation of consciousness remains a philosophical thesis, not an empirical finding, and it should be evaluated as such.

Conclusion

Abhinavagupta’s non-dualism rests on a single, carefully argued conviction: consciousness is not only the light in which things appear but a free, self-aware power that appears as those things. From this conviction follow the rest of his positions. The world is real as manifestation rather than false as illusion. Bondage is self-contraction rather than a stain added from outside. Liberation is recognition rather than escape. Even the pleasure of art becomes evidence of what consciousness is like when its ordinary narrowness relaxes.

The result is a non-dualism that affirms embodied life instead of retreating from it. Its enduring interest lies less in any one doctrine than in the question it keeps returning to. When everything that can be observed has been set aside as an object, what remains is the observing itself. For Abhinavagupta, to see that clearly, and to see the world as its expression, is what it means to recognise Śiva.

References

Dyczkowski, Mark S. G. 1987. The Doctrine of Vibration: An Analysis of the Doctrines and Practices of Kashmir Shaivism. Albany: State University of New York Press.
Gnoli, Raniero. 1968. The Aesthetic Experience According to Abhinavagupta. 2nd ed. Varanasi: Chowkhamba Sanskrit Series Office.
Ingalls, Daniel H. H., Jeffrey Moussaieff Masson and M. V. Patwardhan, trans. 1990. The Dhvanyāloka of Ānandavardhana with the Locana of Abhinavagupta. Cambridge, MA: Harvard University Press.
Lawrence, David Peter. 1999. Rediscovering God with Transcendental Argument: A Contemporary Interpretation of Monistic Kashmiri Śaiva Philosophy. Albany: State University of New York Press.
Masson, J. L., and M. V. Patwardhan. 1969. Śāntarasa and Abhinavagupta’s Philosophy of Aesthetics. Poona: Bhandarkar Oriental Research Institute.
Muller-Ortega, Paul Eduardo. 1989. The Triadic Heart of Śiva: Kaula Tantricism of Abhinavagupta in the Non-Dual Shaivism of Kashmir. Albany: State University of New York Press.
Pandey, K. C. 1963. Abhinavagupta: An Historical and Philosophical Study. 2nd ed. Varanasi: Chowkhamba Sanskrit Series Office.
Sanderson, Alexis. 1988. “Śaivism and the Tantric Traditions.” In The World’s Religions, edited by Stewart Sutherland et al., 660–704. London: Routledge.
Singh, Jaideva, trans. 1963. Pratyabhijñāhṛdayam: The Secret of Self-Recognition. Delhi: Motilal Banarsidass.
Singh, Jaideva, trans. 1979. Śiva Sūtras: The Yoga of Supreme Identity. Delhi: Motilal Banarsidass.
Singh, Jaideva, trans. 1979. Vijñānabhairava or Divine Consciousness. Delhi: Motilal Banarsidass.
Torella, Raffaele, trans. 2002. The Īśvarapratyabhijñākārikā of Utpaladeva with the Author’s Vṛtti. Delhi: Motilal Banarsidass.
Wallis, Christopher D. 2013. Tantra Illuminated: The Philosophy, History, and Practice of a Timeless Tradition. Petaluma: Mattamayūra Press.

Does Nadi Shodhana Balance Your Brain? The Evidence

2026-09-16T09:00:00+05:30

If you have learnt Nadi Shodhana (also called Anulom Vilom) in a yoga class, you have probably heard the explanation that comes with it: breathing through alternate nostrils balances the left and right hemispheres of the brain.

It is a lovely idea. It is also testable. So I went through the research to see what it actually shows. The short version: the practice seems to calm you, but “brain balancing” is the weakest part of the story.

On the bank of the Ganga above Rishikesh.

What the practice involves

Sit upright and relax your shoulders. Close your right nostril with your right thumb and breathe in slowly through the left. Close the left nostril with your ring finger, release the thumb, and breathe out through the right. Breathe in through the right, switch, and breathe out through the left. That is one round. The breath stays slow and unforced.

This matters because some studies use “forced” nostril breathing, which is more vigorous. When you read about the research, check which version was tested.

Where the brain-balancing idea comes from

The claim is not pure mythology. It has two scientific threads.

The first is the nasal cycle. At any moment one nostril is usually more open than the other, and the dominant side shifts over time. Early EEG research found that the relative activity of the brain’s two hemispheres also alternates, and that this correlates with the nasal cycle (PMID 6874437). That is a correlation with a natural rhythm. It does not show that deliberately changing which nostril you breathe through changes your brain.

The second is a small 1994 study. Eighteen trained practitioners did ten minutes of forced alternate nostril breathing. Alpha and beta power increased, and in the second half of the session the asymmetry between hemispheres in one frequency band (beta-1) decreased. The authors described this as a balancing effect (PMID 7876041).

So the claim has a real seed. The question is whether it holds up.

What happened when researchers looked again

In a 2017 study, 13 healthy adults did three separate sessions: alternate nostril breathing, breath awareness, and quiet sitting. Hemisphere symmetry did not change during alternate nostril breathing (PMID 28738882). The research team was based at a yoga research foundation.

The studies on single-nostril breathing, which underpin the whole “left nostril, right brain” logic, do not agree with each other either. In 23 right-handed men, forcing breath through one nostril shifted the balance of verbal versus spatial performance towards the opposite hemisphere (PMID 1938166). Another study found the effects differed by sex: same-side effects in men on both tasks, and opposite-side effects in women, only for spatial tasks (PMID 2923709). A 2022 study using 64-channel EEG found that breathing through either nostril broadly reduced brain-wave power compared with rest, rather than switching on one hemisphere (PMID 35017606).

None of those three tested Nadi Shodhana directly. But they are the foundation the brain-balancing explanation rests on, and that foundation is inconsistent.

What the practice does seem to do

The better-supported story is calm.

In the same 2017 study, relative theta power fell during alternate nostril breathing and beta amplitude was lower afterwards. The authors interpreted this as greater calmness, while quiet sitting without instructions was associated with arousal (PMID 28738882).

A systematic review of randomised controlled trials published between 2013 and 2019 concluded that alternate nostril breathing reduced stress on both psychological and biological measures. Most participants in those studies were Indian and male, so we should be careful about generalising (PMID 33461386).

A 2024 meta-analysis pooled six randomised trials with 525 participants. Alternate nostril breathing lowered systolic blood pressure by about 7 mmHg and diastolic by about 5 mmHg more than control conditions (PMID 39008954). The results varied a lot between studies, and the authors themselves urge caution. It is not a substitute for blood pressure medication.

What research has not answered

We do not know whether any EEG change lasts beyond the session itself, how long or how often you need to practise, or how the effects look in women and in populations outside India. “Balance” is also not a defined measurement, which is part of why the claim is so easy to repeat and so hard to test.

How to try it

Start with a few minutes of slow, comfortable rounds. Never strain or hold your breath in a way that feels uncomfortable. If you feel dizzy or light-headed, stop and breathe normally. If you have a medical condition such as high blood pressure, keep following your doctor’s treatment; think of this practice as something you add, not something you swap in.

The takeaway

Nadi Shodhana is probably worth practising because it seems to calm you, not because it balances your brain.

Sources

Alternating cerebral hemispheric activity and the lateralization of autonomic nervous function. PubMed 6874437
EEG changes during forced alternate nostril breathing (1994). PubMed 7876041
Hemisphere specific EEG related to alternate nostril yoga breathing (2017). PubMed 28738882
The effects of unilateral forced nostril breathing on cognition (1991). PubMed 1938166
Unilateral nostril breathing influences lateralized cognitive performance (1989). PubMed 2923709
EEG signatures change during unilateral Yogi nasal breathing (2022). PubMed 35017606
Alternate nostril breathing to reduce stress: an option for pregnant women survivors of intimate partner violence?. PubMed 33461386
Effectiveness of alternative nostril breathing on blood pressure: a systematic review and meta-analysis of randomized controlled trials (2024). PubMed 39008954

When have I betrayed my own conscience?

2026-09-01T12:14:00+05:30

How can a human being know, with scientific certainty, whether he has betrayed his own conscience? Most people answer this question psychologically. They speak of guilt, regret, shame, or remorse. Others answer it philosophically by appealing to moral principles or social duties. The yogi proceeds differently. He begins not with emotion, nor with morality, but with observation. Yoga is, before all else, a science of consciousness. It is concerned with direct experience, repeatable inner experimentation, and the refinement of the instrument through which truth is known.

Patanjali never asks us to believe what passes through the mind. Rather, he teaches us to become students of the mind itself. His opening definition of Yoga is profoundly scientific:

Yogaś citta-vṛtti-nirodhaḥ.

(Yoga Sutra I.2)

Yoga is the cessation of the modifications of the mind.

Notice what this implies. The ordinary mind is not regarded as a reliable observer. It is continually disturbed by memories, desires, fears, hopes, prejudices, ambitions, and countless impressions accumulated over a lifetime. A scientist does not trust a microscope whose lenses are clouded; he first cleans the instrument before drawing conclusions. Likewise, Patanjali does not ask us first to determine whether an action is right or wrong. He asks us first to purify the instrument of knowing—the citta, or field of consciousness. Only then can our observations become trustworthy.

From this perspective, conscience is not merely a feeling. Modern language often confuses conscience with guilt, but Yoga distinguishes them carefully. Guilt belongs largely to the emotional mind. It may arise because one has violated a social convention, disappointed another person, or failed to live up to an internalized expectation. A person may feel guilty for doing what is actually righteous, simply because he fears criticism. Conversely, another may feel no guilt whatsoever after committing grave injustice if his mind has become conditioned to justify it. Therefore, guilt is an unreliable indicator.

The yogic tradition locates true moral discernment in buddhi, the faculty of discrimination. Buddhi possesses viveka—the capacity to distinguish the real from the unreal, the enduring from the transient, dharma from adharma. When buddhi is clear, one recognizes truth with remarkable simplicity. When it is clouded by desire, fear, attachment, or egoism, this discriminative light becomes obscured. Thus, to betray one's conscience is not merely to violate an external commandment; it is to act contrary to what the purified buddhi already knows to be true.

Patanjali explains why this obscuration occurs through his doctrine of the kleśas, the fundamental afflictions of human consciousness. The root of them all is avidyā, ignorance—not ignorance of information, but ignorance of our true nature. Because we mistake the transient personality for the Self, we become identified with pleasure, status, security, opinion, and possession. From this false identification arise attachment (rāga), aversion (dveṣa), and fear (abhiniveśa). Every betrayal of conscience is therefore preceded by a subtle displacement of awareness. We cease asking, "What is true?" and begin asking, "What will protect my image? What will gratify my desire? What will preserve my position?" The action itself is only the visible consequence; the deeper betrayal has already occurred within consciousness.

This insight possesses striking scientific significance. Modern psychology observes that when people behave in ways inconsistent with their values, they often experience what Leon Festinger termed cognitive dissonance—the psychological discomfort arising from inconsistency between belief and action. Yet rather than immediately changing their behaviour, individuals frequently reduce this discomfort by altering their interpretation of events. They create explanations that preserve their self-image. Yoga anticipated this phenomenon in a more comprehensive form. The restless movements of the mind—its endless justifications, rationalizations, and defensive narratives—are precisely the vṛttis that prevent clear perception. The mind attempts to preserve comfort instead of truth.

How then may one determine whether one has betrayed one's conscience? Patanjali would advise not argument, but experiment. The experiment begins by reducing the disturbances that ordinarily govern perception. Through ethical discipline (yama and niyama), regulation of the life-force (prāṇāyāma), withdrawal from excessive sensory stimulation (pratyāhāra), and meditation (dhyāna), the turbulence of the mind gradually subsides. Only when consciousness becomes comparatively quiet should the inquiry begin.

At that point, the seeker asks neither, "Was I successful?" nor, "Was I praised?" nor even, "Did I obey a rule?" He asks instead, "As my mind becomes quieter, does this action become clearer, or does it require continual mental argument in order to remain acceptable?" This question is extraordinarily revealing. Truth does not require constant defence. It possesses an intrinsic stability. Falsehood, by contrast, demands continuous psychological maintenance. Excuses must be repeated. Memories must be edited. Blame must be redistributed. Silence becomes uncomfortable because it threatens the structures that sustain self-deception.

This observation offers something approaching an empirical criterion within the inner laboratory of Yoga. If, over repeated periods of meditation, an action consistently generates contraction, agitation, defensive thought, or renewed justification, the practitioner should not immediately condemn himself. Rather, he should recognize that unresolved conflict persists within consciousness. If, however, increasing stillness brings increasing clarity, simplicity, and freedom from inner contradiction, then the buddhi is beginning to function unobstructed. The conclusion is not reached by a single emotional reaction but through repeated observation under progressively purified conditions, much as a scientist repeats an experiment to eliminate accidental variables.

Another principle of Yoga deepens this understanding. Patanjali teaches that every action leaves behind a saṁskāra, an impression upon the subtle mind. These impressions accumulate, forming habits, tendencies, and eventually character itself. Modern neuroscience similarly describes how repeated behaviour strengthens neural pathways through processes of learning and neuroplasticity. Although the conceptual frameworks differ, both recognize that actions reshape the individual. When one repeatedly acts against conscience, one does not merely perform isolated deeds; one gradually conditions oneself to perceive reality through increasing distortion. Conversely, each truthful action strengthens the mind's capacity to recognize truth again in the future. Character is therefore the accumulated history of repeated choices.

This explains why individuals who have long ignored conscience often appear remarkably untroubled. The absence of discomfort is not evidence of innocence. It may simply indicate that the mind has become habituated to its own rationalizations. The yogic scientist therefore does not ask whether guilt is present. He asks whether clarity is present. Clarity and comfort are not always identical. Sometimes the first sign of awakening is not peace but the painful recognition of long-denied truth. This discomfort should not be mistaken for failure. It is the beginning of purification.

There is another subtle sign by which the yogi examines himself. Observe your relationship to silence. Many people can remain busy for years, yet become restless when left alone without distraction. They instinctively reach for conversation, entertainment, or occupation. Yoga suggests that such restlessness deserves careful observation. When consciousness carries unresolved contradictions, silence often becomes threatening because it removes the distractions that keep these contradictions hidden. As meditation deepens, what was previously concealed gradually rises into awareness—not as punishment, but as an opportunity for liberation. The purified mind becomes willing to see what the distracted mind could not bear to acknowledge.

Ultimately, however, Patanjali directs us beyond even conscience. After defining Yoga as the cessation of mental modifications, he declares:

Tadā draṣṭuḥ svarūpe avasthānam. (Yoga Sutra I.3)

Then the Seer abides in His own true nature.

This aphorism reveals the highest dimension of the inquiry. Conscience is not the final authority; it is the reflection of Truth within the purified intellect. Behind both the conscience and the mind stands the Seer, the immutable witness who observes every thought, every justification, every virtue, and every failing without itself becoming altered. The closer consciousness approaches this witnessing awareness, the less morality appears as obedience imposed from without and the more it becomes spontaneous expression from within. Virtue is no longer forced. It flowers naturally because the obstacles to clear seeing have been removed.

So, if you sincerely wish to know whether you have betrayed your conscience, do not ask the question in the marketplace of opinions. Do not ask it while the mind is inflamed by passion or fear. Ask it only after you have quieted the senses, steadied the breath, disciplined the life, and entered the stillness of meditation. Then observe without haste. If the action shines with increasing simplicity as silence deepens, you may proceed without fear. If it survives only through argument, excuse, or mental noise, continue your inquiry. Do not condemn yourself, but neither deceive yourself. Let Truth reveal itself in its own time.

The world judges by appearances. The intellect judges by logic. The emotions judge by pleasure and pain. But Yoga asks for something infinitely subtler. It asks whether, in the profound stillness where every defence has dissolved and every excuse has become silent, the heart rests effortlessly in Truth. There, and there alone, the science of conscience reaches its fulfilment.

Why we say we are not the solution

2026-09-01T00:57:00+05:30

A platform built around inner work can easily make a tempting promise: come here, follow the method, and your suffering will be solved. We think that promise deserves to be questioned.

Ram Jhula, Rishikesh.

Relief is not the same as understanding

A practice may help someone feel calmer, sleep better, focus more easily, or create a little more space between an experience and a reaction. Those outcomes can matter enormously. But experiencing a benefit does not mean that a platform, teacher, or technique has become the solution to a person's entire life.

What a method can actually do

A useful method gives you something you can examine and practice. It can give you questions, observations, exercises, texts, measurements, and ways of noticing change. It can support inquiry without pretending that every difficult experience has a single explanation.

Why we resist being the answer

The moment a platform presents itself as the final answer, the learner can become dependent on the platform rather than becoming more capable of understanding themselves. We would rather build a space that leaves the practitioner with better questions, stronger discernment, and tools they can continue to use without us.

Tradition without surrendering inquiry

Traditional yoga literature contains centuries of observations, interpretations, practices, metaphors and philosophical systems. Respecting that history does not require treating every historical statement as a scientifically established fact. We can study the texts carefully while asking what is experiential, what is philosophical, what is testable, and what remains uncertain.

The practitioner remains central

Ultimately, the work returns to the person doing it. A teacher can guide. A text can challenge. A scientific study can constrain a claim. A practice can create conditions for observation. None of these removes the need for the individual to observe, question, reflect and choose.

Neuroscience of Meditation

Can You Choose Which Nostril Is Open?

The instruction nobody quotes

Lying on your side is the one that works

The crutch under the arm

Exertion opens both sides, and not for long

The method I could not find a study for

The objection, which is the interesting part

The one instruction that lands

What I take from this

Sources

Does Slower Breathing Make Meditation Deeper?

There is no place where meditation happens

What breathing actually reaches

The part that holds up, and the part that does not

Why the second one is hard

The prediction story, and what it is

One overclaim worth retiring

What I actually do

Sources

What Meditation Researchers Say When They Are Talking to Each Other

The published record is 87% positive

The brain-change story, in two studies

The largest school trial found nothing

A null the researcher led with

Things presented but not yet published

What I take from this

Sources

The Text Names Seven Things to Measure. Four of Them Are Measurements.

The scheme is better built than its reputation

Four dimensions you can actually check

Three dimensions that exist only in the report

The flaw is not the soft three

What disaggregation gets you

Why the classification has to be blind

The four measurable ones are noisier than they look

What I kept

Sources

Did Your Brain Create Consciousness, or Does Consciousness Create Your Brain?

In brief

The argument, as the tradition makes it

Do not mistake the lute for the music

What the brain studies actually show

The state of the science is worse than you think

Why none of that helps the tradition

What I keep

Sources

What I Left Out of the Swar Yoga Tool, and Why

The four, before the detail

One: the retention I will not teach

Two: the eye pressure I took out

Three: the shape I will not read

Four: the rule that cannot be wrong

What this costs

Sources

How to Measure Meditation

The study, in one paragraph

What moved, and what did not

Faster is not the same as more

What an N2 can and cannot tell you

One component out of five

The comparison I would change first

Thirty days is a snapshot

Thirty-four men

So how do you measure meditation?

The Nasal Cycle, as Physiology Understands It

What it is, and who found it

The periods people report

How many people actually have a regular cycle

The autonomic control is the solid part

Where the whole field is thin

What I take from this

What Shiva Swarodaya Actually Claims About the Hour

The unit it counts in

Claim one: five phases inside one flow

Claim two: twelve changes in a day and night

Three figures, and the text reconciles none

Which of the three is closest

The moment between

What would count as evidence either way