An electroencephalogram (EEG) is a test that measures and records the electrical activity of your brain. Special sensors (electrodes camera) are attached to your head and hooked by wires to a computer. The computer records your brain's electrical activity on the screen or on paper as wavy lines. Certain conditions, such as seizures, can be seen by the changes in the normal pattern of the brain's electrical activity.
An electroencephalogram (EEG) may be done to:
- Diagnose epilepsy and determine what types of seizures are occurring. EEG is the most useful and important test in confirming a diagnosis of epilepsy.
- Identify the location of a suspected brain tumor, inflammation, infection (such as encephalitis or meningitis), bleeding, head injury, or disease in the brain, such as Parkinson's disease.
- Evaluate periods of unconsciousness or dementia.
- Help predict a person's chance of recovery after a change in consciousness.
- Confirm or rule out brain death in a person who is in a coma.
- Studies sleep disorders, such as narcolepsy.
- Monitor brain activity while a person is receiving general anesthesia during surgery.