This auditory illusion is called a binaural beat. For example, if a person hears a tone of 405 Hz in one ear and a tone of 415 Hz in the other, they would be hearing a binaural beat with a ...

For example, if the binaural beat is somewhere between 9 to 14Hz, in theory it would correspond with alpha waves, which are associated with states of relaxation like meditation. Sign up to get the ...