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(Physiology) physiol the normal electrical activity of the cerebral cortex during deep sleep, occurring at a frequency of 1 to 4 hertz and detectable with an electroencephalograph. See also brain wave
a pattern of slow brain waves, less than 6 cycles per second, associated with the deepest phase of slow-wave sleep.
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|Noun||1.||delta rhythm - the normal brainwave in the encephalogram of a person in deep dreamless sleep; occurs with high voltage and low frequency (1 to 4 hertz)|