Research has conclusively proven that the brain emits a characteristic EEG frequency based on the level of activity being performed: As noted in the descriptions below, the Alpha brain wave frequencies start the relaxation process progressing into the Theta brain waves as one falls asleep at which time healing is induced. Finally, Delta occurs in deep sleep.
Considering the analogy of 2 tuning forks of the same frequency - if 1 is tapped causing it to vibrate, then it induces the 2nd one to vibrate as well. This is called “entrainment”. It is this theory that describes audio-visual entrainment – ie we provide specific frequencies in the form of sound & colors using a headset to ‘tune’ your brain to relax & ultimately promote healing.