An electroencephalogram (EEG) is a test used to detect abnormalities related to electrical activity of the brain. This procedure tracks and records brain wave patterns.
Small metal discs with thin wires (electrodes) are placed on the scalp, and then send signals to a computer to record the results.
Normal electrical activity in the brain makes a recognizable pattern. Through an EEG, doctors can look for abnormal patterns that indicate seizures and other problems such as sleep disorders and changes in behavior.