Music and the brain: what listening does

The Indian classical tradition has long held that sustained, attentive listening can settle the body and quiet the mind. Over the past three decades, contemporary neuroscience has begun to describe, in its own vocabulary, much of what that tradition already knew. This essay sketches three of the better-documented findings, with citations, for readers who want a modern frame for what they experience at a meditation concert.

The brain in alpha and theta

The brain produces electrical rhythms at different frequencies depending on what we are doing. Beta waves (roughly 13 to 30 Hz) dominate ordinary problem-solving and stress. Alpha waves (8 to 13 Hz) appear in alert, quietly focused states, and theta waves (4 to 8 Hz) appear in deep relaxation, drowsiness, and absorbed meditation. EEG studies of trained meditators consistently show increased alpha and theta power, particularly over frontal regions, during practice (Lutz, Greischar, Rawlings, Ricard and Davidson, 2004; Cahn and Polich, 2006).

Slow, melodic music with little rhythmic urgency tends to push listeners towards the same alpha or low-beta range. The effect is not magic; it is a measurable shift in the dominant cortical rhythm in response to a sustained, predictable acoustic environment.

Why music reaches what words cannot

Stefan Koelsch, one of the most cited researchers in the field, has argued that music engages a remarkably broad network of brain regions, including those for emotion (amygdala, nucleus accumbens), memory (hippocampus), motor planning (premotor cortex), and social cognition (Koelsch, Brain and Music, 2012). Because the network overlaps with the systems that regulate emotion and stress, music can act on those systems directly, without needing to pass through verbal reasoning. This is part of why a piece of music can change a mood in a way that an argument cannot.

The parasympathetic shift

Slow music with a steady pulse below about 80 beats per minute reliably lowers heart rate, blood pressure, and circulating cortisol in healthy listeners (Bernardi, Porta and Sleight, 2006; Thoma and colleagues, 2013). The mechanism is the autonomic nervous system: the listener shifts out of sympathetic (fight-or-flight) dominance and into parasympathetic (rest-and-digest) dominance. After about ten to twenty minutes, breath and pulse begin to entrain to the music rather than the other way round.

A meditation concert is, in this sense, designed for the long form. The opening passages are slow on purpose. They are not an introduction; they are part of the medicine.

From music therapy to neurologic music therapy

The clinical use of music as treatment has matured into its own discipline. Michael Thaut and colleagues developed Neurologic Music Therapy, a set of evidence-based interventions for stroke rehabilitation, Parkinson’s disease, traumatic brain injury, and chronic pain (Thaut and Hoemberg, Handbook of Neurologic Music Therapy, 2014). Hospitals in Europe and North America now routinely offer music-based interventions for pre- and post-operative anxiety, intensive-care delirium, and palliative care.

None of this replaces the older tradition described elsewhere on this site. It does, however, mean that the Indian classical insistence on music as a form of medicine is no longer a metaphor that needs defending. The two literatures, ancient and contemporary, are converging on the same point from opposite directions.

Further reading

• Lutz, A., Greischar, L. L., Rawlings, N. B., Ricard, M., and Davidson, R. J. (2004). Long-term meditators self-induce high-amplitude gamma synchrony during mental practice. PNAS, 101(46), 16369 to 16373.
• Cahn, B. R., and Polich, J. (2006). Meditation states and traits: EEG, ERP, and neuroimaging studies. Psychological Bulletin, 132(2), 180 to 211.
• Koelsch, S. (2012). Brain and Music. Wiley-Blackwell.
• Bernardi, L., Porta, C., and Sleight, P. (2006). Cardiovascular, cerebrovascular, and respiratory changes induced by different types of music in musicians and non-musicians: the importance of silence. Heart, 92(4), 445 to 452.
• Thoma, M. V., La Marca, R., Bronnimann, R., Finkel, L., Ehlert, U., and Nater, U. M. (2013). The effect of music on the human stress response. PLOS ONE, 8(8), e70156.
• Thaut, M. H., and Hoemberg, V. (eds.) (2014). Handbook of Neurologic Music Therapy. Oxford University Press.