delta rhythm

delta rhythm

noun Physiology.
a pattern of slow brain waves, having a frequency of less than 6 cycles per second as recorded by an electroencephalograph, associated with deep sleep.

Origin:
1935–40

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World English Dictionary
delta rhythm or delta wave
 
n
physiol See also brain wave 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
 
delta wave or delta wave
 
n

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American Heritage
Medical Dictionary

delta rhythm n.
A brain wave pattern originating from the forward portion of the brain and having a frequency of between 1.5 and 4.0 hertz; it is associated with deep sleep in normal adults. Also called delta wave.

The American Heritage® Stedman's Medical Dictionary
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