delta wave

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delta wave

n.
An electrical oscillation occurring in the human brain at a frequency of less than about four hertz as recorded on an electroencephalogram, associated with a state of deep sleep or unconsciousness. Also called delta rhythm.

del′ta wave`


n.
any of the slow brain waves constituting delta rhythm.
[1935–40]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.delta wave - the normal brainwave in the encephalogram of a person in deep dreamless sleep; occurs with high voltage and low frequency (1 to 4 hertz)
brain wave, brainwave, cortical potential - (neurophysiology) rapid fluctuations of voltage between parts of the cerebral cortex that are detectable with an electroencephalograph
References in periodicals archive ?
pdf) comes with  the slow brain waves known as delta waves and the eyes and muscles do not move.
12 seconds), and delta waves (best seen in leads II, III, aVF, V1, V3-V6), are features of ventricular preexcitation of the Wolff-ParkinsonWhite type (WPW).
has provided a detailed schematic scheme explaining positive, negative and isoelectric delta waves that may help the interpreters in making more precise analysis.
The Alpha frequency is produced when we are physically and mentally relaxed as well as aware of our surroundings, The Theta and Delta waves range from a state of reduced consciousness to being completely unconscious.
Considering variations, EBB was defined as low-amplitude bursts of rhythmic sharp beta waves of 20-30 Hz that were superimposed on low or moderate-amplitude delta waves of 1-4 Hz or theta waves of 4-7 Hz that could be rhythmic.
Delta waves are amplitude dependent but power given by FFT does not give amplitude hence underestimate stage N3.
Delta waves from 0-4Hz represent sleep, Theta waves between 4-8Hz represent drowsiness, Alpha 8-12Hz has a relaxed focus.
For example, "Our sleep titles help drop you into the deep delta waves.
Stages 2 and 3 are deeper sleep, and associated with delta waves on the EEG.
Transported into delta waves by music like this, a listener gets the distinct impression that the composer and musicians are, in fact, intentional and instrumental hypnotists.
Theta (5-8 Hz) and delta waves (0-4 Hz) are observed when a person is daydreaming and sleeping respectively.