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Binaural beats or binaural tones is a technology where tones of different frequencies are played to each ear through headphones. This creates a beat effect, and when the beat frequency corresponds to the Delta, Theta, Alpha, Beta or Gamma range of brainwave frequencies, this causes the brainwaves to entrain to the beat frequency. This is sometimes used as an aid for meditation, altered states of consciousness or recovery of repressed memories.
Binaural beats were discovered in 1839 by Heinrich Wilhelm Dove.
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