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Binaural Beats was first discovered by Dr. H.W. Dove in Germany in 1839 and developed by Dr. Gerald Oster of Cedars-Sinai Medical Center in the U.S.A. in 1973. When frequencies of a sound are given differently to the left and right ears through earphones, for example of 200hz to the left and 210hz to the right, the brain recognizes a 10hz difference in frequencies then tries to equalize the frequencies by generating a third frequency sound which is Binaural Beats. The principle of Binaural Beats is to change the existing brain waves by resonating the nucleus of the brain stem then sending the signal to the cerebral cortex. There is various sleep-inducing music that uses this principle.
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