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A binaural beat is an auditory illusion. It is perceived when two different pure-tone sine waves are presented to a listener, one tone to each ear. For example, if a 530 Hz pure tone is presented to a subject's right ear, while a 520 Hz pure tone is presented to the subject's left ear, the listener will perceive the illusion of a third tone. The third sound is called a binaural beat, and in this example would have a perceived pitch correlating to a frequency of 10 Hz, that being the difference between the 530 Hz and 520 Hz pure tones presented to each ear. They may help people with pain when they are in hospital. Some people use binaural beats to help them sleep, meditate or have out of body experiences. There are computer programs and smartphone programs that make binaural beats. Many of the claims are not verified at present. Theta waves generate the theta rhythm, a neural oscillation in the brain that underlies various aspects of cognition and behavior, including learning, memor
