Electroencephalogram, more commonly known as EEG, is a painless neurological test that measures the electrical signals from the outer layer of the brain. Data from the test is then recorded on a computer. An EEG is used to evaluate seizure and sleep disorders.
What happens during an EEG?
Prior to the procedure the patient’s scalp is measured and marked in order to localize placement of electrodes. The scalp area is cleaned with a special exfoliate cream. A technician will fill the cup electrodes with a special conductive paste that helps pick up electrical signals. The cup electrodes are then attached to the scalp and held in place with tape. This procedure takes between 1-2 hours and is painless.
During the test the patient lies down. He or she will be encouraged to hold still as long as possible. A strobe light, or frequent flashes of light, will be used to stimulate brain wave function to facilitate the exchange of electronic data between the electrodes and the recording system. The child will then be asked to breathe deeply and rapidly. These stimulation techniques may induce certain types of seizure disorders.