Usually, the EEG will record your brain activity for 30 to 40 minutes. It takes about the same amount of time to prepare for the recording; so the entire procedure usually takes 1 to 1½ hours. However, depending on your condition, your doctor may request for a prolonged EEG recording of 8 or even 24 hours duration. The test is performed by a neurotechnologist. Electrodes are held in place by a paste that can be washed off easily when the test is over. The EEG is recorded in a quiet room, which often is dimly lit. The technologist may ask you to open and close your eyes several times, perform some simple calculation tasks, may shine flashing lights, or may ask you to breath deeply. If you have any symptoms of a seizure during the test, tell the technologist. It is preferable if you fall asleep during the recording as it may provide extra information.
After the EEG recording is done, the technologist will remove the electrodes from your scalp, and you can wash the paste out of your hair. The doctor usually reads the EEG after you have left and will tell you the results later.
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