Chanting Calms People Down, and the Most Likely Reason Is Extremely Boring
Mantra recitation across several religious traditions converges on a slow, sustained, vocalised exhalation. That is also the single breathing pattern with the best evidence for shifting the autonomic nervous system.
Friday, September 4, 2026/3 min read
Sustained vocal recitation appears in an improbable number of unrelated traditions. Vedic chanting, Buddhist sutra recitation, Qur'anic tajwid, Gregorian chant, Jewish davening, Sufi dhikr, the rosary. These traditions did not borrow the practice from one another, and they arrived at strikingly similar forms.
Something about it works, and the most plausible explanation is not mystical at all.
The mechanism nobody finds romantic
You cannot chant and breathe quickly at the same time.
Sustained vocalisation requires a long, controlled, slow exhalation. A chanted phrase forces the out-breath to last several seconds, and the in-breath between phrases is comparatively short. Which produces, without anyone intending it, a breathing pattern of a few breaths per minute with the exhalation much longer than the inhalation.
That is the pattern with the best evidence in the whole field. Slow breathing at around six breaths a minute brings heart rate variability into resonance with blood pressure regulation and shifts autonomic balance towards the parasympathetic side. We set that out in detail in our piece on slow breathing.
An often-cited study on the rosary and on a Sanskrit mantra found that both, recited in their traditional forms, produced a breathing rate very close to six a minute. Nobody designing the rosary knew what baroreflex resonance was. They arrived at it by ear.
What the brain imaging shows, and what it does not
There is a frequently quoted pilot fMRI study of audible OM chanting in 12 healthy volunteers, comparing chanting against making an extended ssss sound and against rest.
It reported significant deactivation during chanting in the bilateral orbitofrontal cortex, anterior cingulate, parahippocampal gyri, thalami and hippocampi, and in the right amygdala. Crucially, the comparison task of pronouncing ssss did not produce those changes, which the authors took to suggest the effect was not merely about making a sustained sound.
That is genuinely interesting and it is one small pilot study with twelve people. It is presented across the internet as though it demonstrated something settled about the vagus nerve and the brain. It does not, and the authors did not claim it did.
The vagal explanation, that vibration in the throat and around the ear stimulates auricular branches of the vagus nerve, is a reasonable hypothesis rather than an established finding. The slow-exhalation explanation requires no new mechanism at all and accounts for most of what is observed, which is a point in its favour.
Why this reading does not diminish anything
There is a way of writing about religious practice that treats a physiological explanation as an exposure, as though finding the mechanism reveals the practice to be nothing but the mechanism.
That gets it backwards. These traditions were not trying to regulate anyone's baroreflex. They were doing something else entirely, over centuries, and the physiological effect is a by-product that happens to be measurable. Noticing the by-product tells you nothing about the value of what they were actually doing.
It does explain a puzzle: why so many unconnected traditions converged on the same form. A practice that reliably makes people feel calmer and more collected will be retained and transmitted, whatever the theology attached to it, and the traditions that found this form kept it.
If you want to use it
The content of the phrase is largely irrelevant to the physiology, though obviously not to the practitioner. What matters is that it is long, sustained, comfortably pitched and repeated.
Do not force the breath. Chanting until you are short of air defeats the point, and the target is a comfortable long exhalation rather than a maximal one.
Audible works better than silent for this particular effect, since silent repetition does not constrain the breath in the same way. Low pitch is easier to sustain than high.
And the usual caution applies to intensity. Practices involving forceful breathing or extended retention carry real risks, and group settings with heavy repetition can produce disorientation in some people, which belongs to the same adverse event picture we describe in our piece on meditation.
Published in The Outspoken Digest
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