Delta wave

A delta wave is a large, slow (less than 4 Hz) brain waveassociated with deep sleep.

In the heart a delta wave in the ECG is seen in Wolff-Parkinson-White syndrome.

Image:Eeg delta.svg

Delta waves are present only in stage-three sleep, stage-four sleep, cases of brain injury and coma. During sleep, delta waves are not present in the other stages (1, 2, and REM).

See Slow Wave Sleep

See also

• Electroencephalography
• Theta wave
• Alpha wave
• SMR
• Beta wave
• Gamma wave

zh:delta?

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It uses material from the http://en.wikipedia.org/wiki/Delta+wave Wikipedia article Delta wave.