Being mentally alert is a state of mind and we are obviously not always alert. Our mood and general level of physiological arousal will tend to range from deep sleep through drowsiness to a normal waking state; occasionally we experience a state of high agitation or excitement, and under extreme conditions, terror and panic. High arousal tends to be accompanied by changes in the electrical activity of the brain as recorded by electroencephalogram (EEG), and by an increase
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