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.
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