The Drum and the Trance
SCIENCE The 1962 drum experiment
In 1962 the psychologist Andrew Neher noticed something about drumming ceremonies around the world: the beat often sits around 4 to 7 strokes per second — the same range as the brain's theta rhythm. In the lab he played drumbeats to volunteers while recording their EEG, and reported that brain activity tended to follow the beat ("auditory driving"), much like a flickering light can drive the visual brain.
THE COMPLICATION THAT MATTERS
Neher's idea was famously criticised by the ethnomusicologist Gilbert Rouget: "If Neher were right, half of Africa would be in a trance from the beginning of the year to the end." Rouget's point: lab tones are steady, real drumming varies constantly, and people in ceremonies enter trance on purpose, prepared by culture and intention. Rhythm opens a door; it doesn't push you through it.
SCIENCE Inside the scanner
In 2016, Michael Hove and colleagues put 15 experienced shamanic practitioners in an fMRI scanner and played them rhythmic drumming for 8 minutes — once while they entered trance, once while they deliberately didn't. Same sound, different state. In trance, a hub of the brain's inward-facing "default network" (the posterior cingulate) linked up more strongly with control regions, while the auditory pathway became less connected: the drum was still playing, but the brain was turning inward and tuning it out. That fits Rouget perfectly: same drum, different intention, different brain.
On the Dance Floor
Pick one steady rhythm for ten minutes and don't follow the melody — follow only the pulse. Then, still moving, decide to go inward. Notice whether anything changes when you add intention to the same beat. The films in this course do the same trick with sound: a binaural beat in the theta range under every scene.
DONE WHEN...
You can explain why Neher's theory is both influential and incomplete, and what the 2016 scan added: trance is rhythm plus a chosen inward turn.
References & Resources
Neher, A. (1962). A physiological explanation of unusual behavior in ceremonies involving drums. Human Biology, 34(2), 151–160.
Rouget, G. (1985). Music and Trance: A Theory of the Relations between Music and Possession. University of Chicago Press.
Hove, M. J., Stelzer, J., Nierhaus, T., Thiel, S. D., Gundlach, C., Margulies, D. S., Van Dijk, K. R. A., Turner, R., Keller, P. E. & Merker, B. (2016). Brain network reconfiguration and perceptual decoupling during an absorptive state of consciousness. Cerebral Cortex, 26(7), 3116–3124.