Electroencephalogram (EEG)

An electroencephalogram (EEG) is a procedure that measures the
electrical impulses in the brain. An EEG is done by placing small sensors
(electrodes) on a person's scalp to detect the electrical impulses moving
through the brain.

An EEG is often used to help determine the presence and cause of
seizures. The amount and pattern of electrical activity is important in
diagnosing seizure disorders.