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 The sensation of auditory binaural beats occurs when two coherent sounds of nearly similar frequencies are presented to each ear with stereo headphones or speakers. If the left ear is presented with a steady tone of 200Hz and the right ear a steady tone of 210Hz, these two tones combine in the brain. The brain integrates the two signals, producing a sensation of a third sound called the binaural beat. This 10Hz beat signal is formed entirely by the brain.In binaural harmonic technology the 200Hz and 210Hz frequencies are known as carried frequencies. The frequencies used are pure sine wave generated frequencies.
Binaural beats originate in the brainstem's superior olivary nucleus, the site of contra lateral integration of auditory input. The binaural beat is neurologically conveyed to the reticular formation which uses neurotransmitters to initiate changes in brain-wave activity. Binaural beats can be perceived only when the right-ear and left-ear tones used to produce them are of low pitch, usually less than 1500Hz.Brainwave harmonics use carrier frequencies of less than 150Hz. These lower frequencies are thought to be more soothing.  Monaural beats produced with two tones of equal intensity sound clean and pure. Binaural beats initially have a slight warbling sound as your brain adjusts this will disappear. To produce perfect monaural beats the amplitudes of the two tones have to be identical. Binaural beats maintain their intensity regardless of the relative amplitudes of the right-ear and left-ear tones even if one ear is below threshold (a hearing loss in one ear may not reduce the effectiveness of binaural beats). Masking monaural beats with noise eliminates the perception of beating and the measurable EEG frequency-following response. Masking binaural beats with white or pink noise does not decrease their effectiveness.
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 If binaural frequencies are applied to the brain, it becomes possible to entrain the brain frequency from one stage to another. For example, if a person is in beta state and a binaural frequency of 12Hz is applied to their brain for some time, the brain frequency is likely to change towards the applied frequency. The effect will be relaxing to the person. This phenomenon is also called frequency following response.
When the brain's dominant frequency is close to the applied frequency, entrainment works more efficiently. Thus, when doing a sweep from one frequency to another, the starting frequency should be as close to your current brain state as possible. The sweep speed should be such that your brain's state changes steadily with it, so that the difference never gets very large.
You could liken the effect to a tuning fork or the harmonic vibration of a glass. Most of the brainwave harmonic programmes start from 18Hz - 20Hz and sweep down to the required harmonic.
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