Help support this channel on Patreon: https://www.patreon.com/crysknife007 The brain produces a phenomenon resulting in low-frequency pulsations in the amplitude and sound localization of a perceived sound when two tones at slightly different frequencies are presented separately, one to each of a subject's ears, using stereo headphones. A beating tone will be perceived, as if the two tones mixed naturally, out of the brain. https://en.wikipedia.org/wiki/Binaural_beats