Q.

Which rhythm is the principal component of the EEG that indicates the alertness of the brain?

A. theta rhythm
B. gamma rhythm
C. beta rhythm
D. alpha rhythm
Answer» D. alpha rhythm
Explanation: The alpha rhythm is the principal component of the EEG and is an indicator of the state of alertness of the brain. It serves as an indicator of the depth of anesthesia in the operating room. The frequency of the EEG seems to be affected by the mental activity of a person. Topic 2.4 EMG– unipolar and bipolar mode.
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