Merck Manual

Please confirm that you are not located inside the Russian Federation

honeypot link
Recording Brain Activity
NEU-brain-activity-normal
Recording Brain Activity

    An electroencephalogram (an EEG) is a recording of the brain’s electrical activity. The procedure is simple and painless. About 20 small adhesive electrodes are placed on the scalp, and the brain’s activity is recorded under normal conditions. Sometimes the person is exposed to various stimuli, such as bright or flashing lights, to try to provoke a seizure.