Binaural beats are an emerging form of soundwave therapy and are considered auditory illusions. This is because your brain is taking two slightly different sounds waves and registering the difference as one separate beat, in addition to the tone in each ear. So, you’re hearing something that the human ear cannot hear without the first two tones working in tandem.
Every person responds differently to these beats, depending on the pattern and frequency used, but frequencies should be less than 1000 hertz for the human brain to detect in the first place.
When used properly, advocates of binaural beat therapy compare the experience to meditation. This is because of the obvious affect they have on human brainwaves, relaxing the listener, or helping the listener focus.