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Heterodyne - Heterodyning in the Human brain

Heterodyne - Heterodyning in the Human brain: Encyclopedia II - Heterodyne - Heterodyning in the Human brain

Heterodyning is not confined to electrical signals, but can occur in any medium where signals of different frequencies are mixed, such as sound vibrations in the aircraft engine example given above. The human brain heterodynes stereo signals; by playing two tones with different frequencies (or the same audio with different phases), a beat frequency called binaural beat is produced inside the brain. People can use this phenomenon to alter their brain wave frequency, as the brain is an oscillator and can be externally driven. As the hum ...

See also:

Heterodyne, Heterodyne - Origin and use, Heterodyne - Heterodyning in the Human brain

Heterodyne, Heterodyne - Heterodyning in the Human brain, Heterodyne - Origin and use, Ring modulation, Electroencephalography, Heterodyne detection

Heterodyne: Encyclopedia II - Heterodyne - Heterodyning in the Human brain



Heterodyne - Heterodyning in the Human brain

Heterodyning is not confined to electrical signals, but can occur in any medium where signals of different frequencies are mixed, such as sound vibrations in the aircraft engine example given above. The human brain heterodynes stereo signals; by playing two tones with different frequencies (or the same audio with different phases), a beat frequency called binaural beat is produced inside the brain.

People can use this phenomenon to alter their brain wave frequency, as the brain is an oscillator and can be externally driven. As the human ear cannot detect the low frequencies required for this phenomenon, a pair of higher frequency tones must be used. The brain wave frequencies range from 1 to 30Hz or so, while the ear is sensitive to no signal lower than 20Hz. (For example, a 101Hz signal mixed with a 100Hz signal will produce a beat frequency of 1Hz, the difference of the two; but its tone will sound like 100.5Hz, the average of the two. One would hear a 100.5Hz tone with an amplitude (or volume) which oscillates once per second. While a 1Hz non-heterodyne signal could be produced, it would be impossible to hear, though possible to feel.) Optical stimulation is usually more successful, as much more of the human brain is devoted to processing visual information, and it can utilize amplitude modulation, rather than beat frequency. Stimulation in this manner can produce changes in consciousness, as different brain wave frequencies are associated with unique states of mind. Epileptics and people otherwise sensitive to flashing lights should use caution with any brain wave stimulation technique.




Adapted from the Wikipedia article "Heterodyning in the Human brain", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki

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