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The brain integrates the two signals, producing a sensation of a third sound called the binaural beat.
For example, if a frequency of 100 Hz is played in one ear and 107 Hz is played in the other ear, a binaural beat of 7 Hz is created by the brain.
Brain waves match or “follow” the binaural beat. If the binaural beat is 7 Hz, an increase in brain waves of 7 Hz occurs.