An audio recording made on November 18, 1978, at the Peoples Temple compound in Jonestown, Guyana immediately preceding and during the mass suicide and murder of over 900 members of the cult.
As the coherent resonance produced by the human heart in a state of profound relaxation reaches the fluid layer surrounding the brain, it sets up a rhythmic pattern in which the brain moves up and down approximately 0.005 to 0.010 millimeters in a continuous pattern.