Defining and Describing Binaural Beats
Advances in modern neuro and cognitive sciences have revealed startling and controversial findings about the human brain and body, including the effects of sounds on humans.
Specifically, scientists have uncovered physical effects on the brain made by running closely related pure-tones (a single, constant frequency) into both ears through headphones. The tones are only slightly different than one another.
Binaural beats are generated:
by playing two loud tones in each ear that are very close in frequency. The brain processes this by filling in the difference and creating a third tone that is roughly the difference of the two. For instance, if you play a 400 Hz tone in one ear and 410 Hz tone in the other, your brain will create a binaural tone of 10 Hz. The theory behind this is that you can create specific audio clips that when played in your ears will stimulate your brain to produce a tone that corresponds with one of the naturally occurring brain states.