Binaural beats are auditory illusions created as a result of two tones listened to at different frequencies, one in each ear. The human brain perceives the creation of a new, third tone, whose frequency is equivalent to the difference between the two tones being played. This auditory illusion is called a binaural beat.

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"Binaural beats provide many of the same benefits as meditation: lower stress, increased focus, aids with sleep and relaxation, boosts mood, assists with pain management, and fosters creativity."

• [psychologytoday.com: 2019]