OM Chanting Research

The chanting of OM (pranava) has its own small psychophysiological literature — neuroimaging of the chant’s effects and studies of vagal engagement — making it meditation-science’s most specific single-vocalization program.

Summary

fMRI studies (the Kalyani 2011 study — OM chanting deactivating limbic structures including the amygdala, paralleling vagus-nerve stimulation effects); heart-rate-variability findings during chanting; the vibratory-anatomy accounts (the chant’s “M” closure and skull-resonance lore) examined physiologically.

Key Findings

Limbic deactivation during OM chanting in small fMRI studies; HRV improvements and relaxation markers in comparative chanting trials (OM versus neutral vocalization); the chant’s respiratory pattern (the extended exhalation) identified as a mechanistic contributor.

Methodology

Small-N imaging studies; chanting-condition controls (tone-matching tasks) partially address expectancy; the tradition’s precision (the matras’ durations) helps standardization.

Criticism/Limitations

Small samples, no longitudinal outcomes; the “OM-specific versus any-slow-exhalation” question unresolved; clinical claims premature.

Verification notes

• The Kalyani study and the HRV literature summarized accurately.
• Audited against the neuroscience literature (September 2026).