When two tones at slightly different frequencies are played separately and heard through stereo headphones or speakers, the brain perceives a third sound: a binaural beat. Though discovered by German scientist Heinrich Wilhelm Dove in 1839, the phenomenon was largely ignored until the 1970s. The beats are now a source of interest for some who think they have the potential to induce relaxation and increase memory and learning ability. How are binaural beats related to the “cocktail party effect”? Discuss