delta wave

Noun
  1. The normal brainwave in the encephalogram of a person in deep dreamless sleep;
    Occurs with high voltage and low frequency (1 to 4 hertz) (synset 111465283)
    is a type of: brain wave, brainwave, cortical potential - (neurophysiology) rapid fluctuations of voltage between parts of the cerebral cortex that are detectable with an electroencephalograph
    same as: delta rhythm

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