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 ...

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“Binaural beats are an auditory phenomenon that occurs when two tones of slightly different frequencies are played in each ear,” says neurologist Dr Faye Begeti. “When each ear hears tones ...