Delta wave

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A delta wave is a large, slow (2 Hz or less) brain wave recorded with an EEG and is usually associated with deep sleep.

Delta waves
Delta waves

Delta activity is characterized by frequencies under 3 Hz and is absent in awake healthy adults, but is physiological and normal in awake children under the age of 13 years. Delta waves are also naturally present in stage three and four of sleep (deep sleep) but not in stages 1, 2, and rapid eye movement (REM) of sleep. Finally, delta rhythm can be observed in cases of brain injury and comatic patients.

Human non-rapid eye movement (NREM) sleep is divided in the categories 2,3, and 4 by the percentage of slow waves.

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A delta wave is seen in the heart using a ECG in the Wolff-Parkinson-White syndrome context.


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