delta rhythm

noun

, Physiology.

1. 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.

delta rhythm

noun

1. See brain wave
   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

Word History and Origins

Origin of delta rhythm¹

First recorded in 1935–40