Binaural beats are 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).
Isochronic tones are a form of auditory stimulation where a single tone is turned on and off rapidly, creating sharp, distinctive pulses of sound. Unlike binaural beats, the pulsation is heard as a single tone and doesn't require two separate tones played into each ear.
Solfeggio frequencies are specific tones of sound that have been used in various forms of music and chant, particularly in ancient Gregorian chants. These frequencies are believed to have specific spiritual and healing properties.
