delta rhythm

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Related to delta wave: theta wave

delta rhythm

[′del·tə ‚rith·əm]
(physiology)
An electric current generated in slow waves with frequencies of 0.5-3 per second from the forward portion of the brain of normal subjects when asleep.
References in periodicals archive ?
Stages 2 and 3 are deeper sleep, and associated with delta waves on the EEG.
Delta: Delta waves tend to be slower and are often associated with deep dreamless, restorative sleep.
Stage 3 sleep is characterized by 20% to 50% delta waves, and stage 4 has more than 50% delta waves.
The deepest stages, namely 3 and 4, which correspond to slow wave sleep (SWS), are characterized by the production of delta waves, which are recognized as a key component of sleep quality.
Delta waves from 0-4Hz represent sleep, Theta waves between 4-8Hz represent drowsiness, Alpha 8-12Hz has a relaxed focus.