<prompt> The normal adult human electroencephalogram EEGa Will not show high frequency waves during stage 3 sleepb Shows alpha rhythm when a person is awake but inattentivec Has lower frequency waves during mental activityd Is predominated by large amplitude waves during REM sleepacaabbc  <response>: Stages of sleep and rhythm- Beta rhythm- Alert, awake, maximum concentration. High frequency, low voltage- Alpha rhythm- Eyes closed, mind wandering, less attentiveness- Theta rhythm- Stage 1 NREM- Sleep spindles, K complex- Stage 2 NREM- Delta rhythm- Deep sleep Stage 3 4 NREM, Rhythm is slow. - Beta Rhythm and occasional alpha rhythm- REM Rapid, low voltage rhythm 