Beats in a shell: When two tones of different frequency are heard together, the difference is the "frequency of the beats" (FOB). E.g. 445hz-440hz=5hz difference. Binaural beats takes advantage of this effect by playing different frequencies to the L and R ears. The brain creates the FOB. People claim this can change brainwave activity to match the FOB - beta for focus, theta for deep relaxation. Unproven.
Answered 8/5/2014
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