Binaural beats are auditory hallucinations that can be created on demand. This short article will tell you how to make binaural beats work.
In 1839 a 36 year old Prussian physicist named Wilhelm Dove discovered when 2 different low frequencies are played simultaneously, one frequency in each ear, interference beats produce an auditory hallucination of a pulsing, regular change in volume.
Normal human hearing covers frequencies between 20 and 20,000 Hz. To make binaural beats work, the different tones played into the different ears must be between 1,000 and 1,500 Hz and the tone difference must be no more than 30 Hz.
Under these conditions the brain produces a neural phenomenon that the individual perceives as a pulsing, regular shift in volume, as if the volume control on a radio was being turned up and then down and then back up. What is fascinating is that if these two frequencies were played together without isolating one frequency to one ear and the other frequency to the other ear, the cross-interference of the two tones would produce exactly the same effect, recordable by external devices. This is what makes binaural beats interesting neurologists.
It has been hypothesized that what is happening is similar to what the brain does to compensate the visual blind spot in our field of vision. For those of you who don't know what I'm talking about, here's a quick explanation of the visual blind spot:
The back of the eye is a solid sheet of light-sensitive rods and cones - except for the point in the sheet where the nerve endings of the rods and cones exit the eye and feed into the optic nerve, which carries the signals from the rods and cones to the visual processing center at the back of the brain.
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I got interesting information from this post of Working of Binaural Beats.