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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).
- Alpha wave
- Beta wave
- Electrical activity
- Gamma wave
- Theta wave
- Slow-wave sleep
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