Electroencephalogram - EEG

The EEG is used to help diagnose the presence and type of seizure disorder, confusion, head injuries, brain tumors, infection, degenerative disease, and metabolic disturbances that affect the brain. It is also used to evaluate sleep disorders and to investigate periods of unconsciousness.

The brain cells communicate by producing tiny electrical impulses. In the EEG, electrodes are placed on the scalp over multiple areas of the brain to detect and record the electrical impulses within the brain. Certain abnormalities can be detected by observing the characteristic pattern of the recorded brain waves. This procedure does not “read the mind” or detect senility. The test is performed by an EEG technician.

During the Test

This test takes 1 - 1½ hours. The technician will apply between 16 and 22 flat metal discs (electrodes) in different positions on your scalp. The discs are held in place with a sticky paste.

The electrodes are connected by wires to an amplifier and the recording machine. The recording machine converts the electrical signals into a series of wavy lines, which are visible to the technician on the monitor.

You will be asked to lie on your back on a stretcher. You will need to lie still with your eyes closed because movement can alter the results.

You will be asked to do certain things during the recording such as breathe deeply and rapidly for several minutes and look at a very bright flickering light. Nothing will be felt during the procedure. The procedure is very safe.

Preparation

Your hair must be clean and free from gels, mousse or hairspray. Little or no makeup should be used, if possible.

Please avoid all foods containing caffeine for 8 hours before the test.

Please bring a list of your medications.

You may want to bring a hat to wear after the test since your hair will be messy from the cream we apply for the test.

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