_____ activity reflects the extent to which an individual is alert, resting, sleeping, or dreaming.

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EEG is a test that measures and records the electrical activity of the brain. It is commonly used to monitor brain waves during sleep, rest, and dreaming, and can provide insight into an individual's level of consciousness and overall brain function. MRS, ECT, and CT scans are not used to measure alertness or sleep patterns.

_____ Activity Reflects the Extent to Which an Individual Is