[spoiler][img]http://27.media.tumblr.com/tumblr_m3sfjrqeoV1roiomko1_500.png[/img][/spoiler] WARNING: -DO NOT listen to Binaural Beats while driving, operating equipment, or any other task that requires concentration. -DO NOT listen to Binaural Beats if you have experienced seizures in the past or have epilepsy. -Those with heart disorders or taking mood-altering pharmaceutical drugs should consult a doctor before trying. How It Works When two tones of specific frequencies are played through headphones, the brain can become confused and produce its own, imagined tone—a three-dimensional audio hallucination heard only within the head of the listener. The frequencies that produce this phenomenon are known as Binaural Beats. What is happening is that the brain is not used to hearing frequencies in each ear so close together and with such intensity—these sounds do not occur in nature and so a mechanism in our brains has not evolved to understand them. Instead, the superior olivary nucleus, the area of the brain which controls aspects of three-dimensional sound perception, bridges the difference between the varying frequencies in Binaural Beats with a common “third tone” in an attempt to normalize this audio into something we can understand. What’s weirder is that each person hears the “third tone” differently: People with Parkinson’s disease can’t hear it at all; women will hear different tones as they move through their menstrual cycle. NOTE: Use headphones while listening. Binaural beats affect our brainwaves directly and can alter moods, behavior, even consciousness. A binaural beat is created by playing a different tone in each ear, and the interference pattern between the slightly differing frequencies creates the illusion of a beat. It’s intended to be heard through headphones, so there’s no cross-channel bleed across both ears. Source: http://did-you-kno.tumblr.com/page/6