Electroencephalogram (EEG)


What is an EEG?

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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