An electroencephalogram is a test that uses sensors to evaluate electrical brain activity.
How You Benefit
An EEG can help your doctor diagnose seizures and assess brain function affected by certain conditions and diseases, such as trauma, coma, infection, tumors and dementia.
What to Expect
An EEG is painless and usually takes about an hour.
Learn more about electroencephalograms, including what to expect and when to call your doctor, at our online Health Library.