Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. A slow brain wave, having a frequency of fewer than six cycles per second, that emanates from the forward portion of the brain and is associated with deep sleep in normal adults. Also called delta rhythm.
WordNet 3.0
- n. the normal brainwave in the encephalogram of a person in deep dreamless sleep; occurs with high voltage and low frequency (1 to 4 hertz)
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treeseed A delta wave is a high amplitude brain wave with a frequency of 1-4 Hertz which can be recorded with an electroencephalogram (EEG) and is usually associated with slow-wave sleep.
Delta wave activity occurs most frequently during stage 4 non-rapid eye movement sleep accounting for 50% or more of the EEG record during this stage.
_ Wikipedia Jul 12, 2008