An EEG (Electroencephalogram) is a painless test that is used to record the electrical activity of your brain. The test involves pasting small sensors (electrodes) to your scalp. These electrodes are connected by wires to a computer that help determine how your brain is functioning. 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 your brain’s electrical activity.

The test takes about 1 hour to complete. There are several types of EEGs, and your doctor will order the one most specific to help evaluate the symptoms you are having.

To prepare for the test:

  • Be sure your hair is CLEAN and DRY. Do not use any styling products such as hairspray or oil. Also, remove any hair weaves, extensions, braids, or glue before your test.
  • Take your regular medications before the test.

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