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

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

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 also

• Slow-wave sleep
• Electroencephalography
• Theta wave
• Alpha wave
• SMR
• Beta wave
• Gamma wave

Дельта-ритм Delta波