A binaural beat is an auditory illusion perceived when two different pure-tone sine waves, both with frequencies lower than 1500 Hz, with less than a 40 Hz difference between them, are presented to a listener dichotically (one through each ear). It follows, therefore, that headphones MUST be used to generate the third tone to experience the intended effects of binaural beats. … Other brainwave entrainment techniques, however, such as isochronic tones do not work in the same way and the intended effect can be achieved without the use of headphones.
Isochronic tones are regular beats of a single tone that are used alongside monaural beats and binaural beats in the process called brainwave entrainment. At its simplest level, an isochronic tone is a tone that is being turned on and off rapidly. They create sharp, distinctive pulses of sound.
How are binaural beats produced?
Binaural beats are created by presenting two different tones at slightly different pitches (or frequencies) separately into each ear. The effect of a third frequency is produced within your brain itself.
This picture explains:
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