Certain foods, medication, or activity can affect your brain activity. Before the test:
You may need to stop certain medications before the test.
You may be asked to avoid
for 8 hours before the test.
If you are having a sleep-deprived EEG, you may need to stay awake the night before the test.
Electrodes will be placed around your scalp for the test. Shampoo your hair the day of the test so that they attach better. Do not use hair styling products.
If you have had seizures, make sure to have a ride available to and from the test.
Description of Test
You will be asked to sit in a chair or lie on a bed. Electrodes will be placed on your scalp with special gel or paste. The electrodes may also be part of a cap that is slipped over your head. The electrodes will record the brain's electrical activity. You will be asked to close your eyes and be still for most of the test. Depending on the reason for the test, there may be other steps such as:
Breathing deeply and rapidly.
Watching a strobe light with fast pulses of light. This can set off a seizure in some.
In some cases, a video recording of the test will be made.
Shevell M, Ashwal S, et al. Practice parameter: Evaluation of the child with global developmental delay: Report of the Quality Standards Subcommittee of the American Academy of Neurology and The Practice Committee of the Child Neurology Society.
Last reviewed March 2018 by
EBSCO Medical Review Board
Rimas Lukas, MD Last Updated: 2/14/2014