Brain cells communicate with each other using electrical impulses. An electroencephalogram (EEG) is a test used to evaluate this electrical activity and detect brain-related problems, including:
Epilepsy
Brain tumor
Head injury
Inflammation of the brain
Stroke
Sleep disorders
Dementia
How Does an EEG Work?
To perform an EEG, a technologist will attach small, flat metal sensors (electrodes) to your scalp with a sticky paste. The sensors are connected to a computer that records your brain’s electrical activity as wavy lines or patterns
During the test, you’ll lie on your back or sit in a chair with your eyes closed. The technologist may ask you to take deep and rapid breaths, look at a flashing light or even go to sleep. The procedure is safe and painless and usually takes about one to two hours.
Tips on Preparing for an EEG
Tell your doctor if you are taking any medicines. You may need to stop taking ones that can impact your usual brain activity.
Don’t eat or drink anything with caffeine for 12 hours before the test.
Make sure your hair is clean and don’t put any sprays, oils or creams on it.
What to Expect During an EEG
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