Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909



Cardiopulmonary Anatomy & Physiolo...

7th Edition
Des Jardins + 1 other
ISBN: 9781337794909
Textbook Problem

Which of the following is characterized by prominent alpha waves (>50 percent)?

A. Eyes open—wake

B. Eyes closed—wake

C. Stage N2 non-REM sleep

D. REM sleep

Summary Introduction


The electroencephalogram (EEG) is a form of test which is used to measure the electrical activity in the brain. The activity is characterized by means of brain waves and is measured by frequency, amplitude, and the polarity of the brain waves. The alpha waves are low-frequency (8-13Hz) waves that are recorded when an individual is in a drowsy state.


Justifications/ Explanations for the correct answer:

Option (b) is given as eyes closed-wake. More than fifty percent of the prominent alpha waves are observed during the eyes closed-wake sleep. The alpha waves are recorded simultaneously in the awakened and the relaxed state. In eyes closed-wake state, slow eye movements and high neuronal activity are observed. Hence, option (b) is correct.

Explanation for the incorrect answer:

Option (a) is given as eyes open-wake. The eyes open-wake sleep have EEG pattern very similar to REM (rapid-eye-movement) sleep. The body is in a comparatively less relaxed state as compared to the eyes closed-wake sleep and thus, the alpha waves are comparatively not that prominent in this sleep. So, it is incorrect.

Option (c) is given a stage N-2 non-REM sleep...

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