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. 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