Main content

    Health Information

    Electroencephalogram (EEG)

    Electroencephalogram (EEG)

    Electroencephalogram (EEG) procedure

    An EEG may be done to study seizures, study sleep disorders, or help find the location of a tumor, an infection, or bleeding. An EEG technologist attaches a cap with fixed electrodes on your head. (An EEG can also be done without a cap by using several individual electrodes.) The electrodes are hooked by wires to a machine that records the electrical activity inside the brain. The machine shows the electrical activity as a series of wavy lines on a computer screen.

    By Healthwise Staff
    Anne C. Poinier, MD - Internal Medicine
    Colin Chalk, MD, CM, FRCPC - Neurology
    Last Revised October 10, 2013

    Last Revised: October 10, 2013

    Author: Healthwise Staff

    Medical Review: Anne C. Poinier, MD - Internal Medicine & Colin Chalk, MD, CM, FRCPC - Neurology

    This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. How this information was developed to help you make better health decisions.

    1995-2014 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.