by Jan 

Binaural Beats


Binaural beats, or binaural beats, are a psychoacoustic phenomenon
that occurs when both ears separately hear sine tones with slightly different
frequency (Oster 1973, p. 94).
Normal beats occur when sound waves are superimposed. The frequency
of the resulting sound corresponds to the mean value of the two
output frequencies and through positive and destructive interference the amplitude
modulated (see Fig. 3).
In contrast to normal beats, binaural beats are not created by
physical interference of 2 sound waves, but through the interaction of the
nerve activity that these trigger in our auditory pathway (Oster 1973, p.94; Pratt et al.
2009, S. 1514).

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