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

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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

I have been asked this question in my homework.

Asked question is from Electrodes for EEG in section Bioelectric Signal and Electrodes of Biomedical Instrumentation

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Correct option is (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.

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