Kevin has volunteered to be a participant in a study on sleep. In studying Kevin's brain activity while he is sleeping, the researcher will most likely use a(n) ____.

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An EEG (electroencephalogram) is a non-invasive test that measures brain activity using electrodes placed on the scalp. It is commonly used in sleep research to monitor brain waves during different stages of sleep. An EKG (electrocardiogram) measures heart activity and would not be useful in studying sleep. An EMG (electromyogram) measures muscle activity and would only be useful if studying movement during sleep. An MRI (magnetic resonance imaging) would provide detailed images of the brain but would not be useful in studying brain activity during sleep.

Kevin Has Volunteered to Be a Participant in a Study