Binaural Beats

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, that is one through each ear. For example, if a 530 Hz tone is presented to a subject 's right ear and a 530 Hz tone is presented to a subject's left ear, the listener will perceive the auditory illusion of a third one. In simpler words, if two tones with two different frequencies are played dichotcially, the brain will make up for the lost frequency by making it's own. This is an amazing phenomenon that helps with concentration, meditation and most importantly. lucid dreaming. If you listen to a binaural beat as you sleep, it can activate a lucid dream.