Delta-wave meaning

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.
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Any of the slowest electrical brain waves, having frequencies less than four hertz and indicating, in adults, deep sleep or brain disease.
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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.
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