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(A) Deep sleep # 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 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.> "Delta waves occur mainly in infants, sleeping adults or adults with brain tumors. Theta waves occur mainly in children ages 2-5 years old. Alpha waves occur in adults who have their eyes closed or who are relaxed. Beta waves mainly occur in adults who are awake, alert or focused."