Electroencephalograph

An EEG, or electroencephalogram, is a test that records the electrical activity of the brain. It is done by using small metal discs (called electrodes) that are attached to your scalp. The brain cells communicate with each other using electrical impulses. This brain activity will show up on an EEG recording as wavy lines.

EEGs are used to diagnose conditions like brain tumors and brain damage from a head injury. It may also help diagnose the type of epilepsy and stroke. It also helps confirm brain death in case of persistent coma and find the right level of anesthesia for someone in a coma.

The normal pattern will look different depending on whether a person is awake or asleep during the test. If the normal pattern of brain waves has been interrupted, that could be a sign of epilepsy or any brain disorder.