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training of the brainwaves to reach low-frequency brainwave patterns and higher frequency gamma states during waking hours. This training allows the brain to seek these frequencies on a regular basis to promote relaxation and a sense of well-being. These states assist the body to rest, relax, and repair. Sound and light mind machines typically use binaural beats to alter the brainwave patterns. To understand how binaural beats work, one can turn to Lane, Kadian, Owens, and March (1997), who offered an explanation in their article “Binaural Auditory Beats Affect Vigilance Performance and Mood”: When two pure auditory signals of similar frequency are mixed together, the phase interference between their waveforms produces a composite signal with a frequency midway between the upper and lower frequencies and an amplitude modulation that occurs with a frequency equal to the difference between the two original frequencies. For example, mixing tones of 100 Hz and 110 Hz yields a signal with a perceived frequency of 105 Hz that rises and falls in amplitude with a frequency of 10 Hz. The amplitude- modulated composite signal is called an auditory beat. A similar phenomenon occurs when auditory signals of similar frequency are presented separately to the left and right ear through stereo headphones. Although each ear hears only one of the frequencies, the listener perceives the middle frequency and the amplitude modulation, even though the auditory beat does not exist in the physical space. This phenomenon, called a “binaural auditory beat,” and described more than 25 years ago, is created by the brain’s processing of the two separate auditory signals at the level of the olivary nuclei of the brainstem. (p. 249) 72PDF Image | Light, Sound, Vibration for Healing and Stress
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