Electroencephalogram (EEG)
An electroencephalogram (EEG) is a test that measures and records the electrical activity of your brain by using sensors (electrodes) attached to your head and connected 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 detected by observing changes in the normal pattern of the brain's electrical activity.
Why It Is Done
An electroencephalogram (EEG) may be done to:
- Diagnose epilepsy
- Identify the type of seizure occurring
- Identify the location of a suspected brain tumor, inflammation, infection, head injury, or disease in the brain, such as Parkinson's disease.
- Evaluate periods of unconsciousness or dementia.
- 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.
- Study sleep disorders
- Monitor brain activity while a person is receiving general anesthesia during surgery
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