![]() Doing this helps ensure that the recording will be of high quality.ĭuring the test, the room will be quiet and dark. They will rub a paste called conductive gel between the electrodes and the scalp to make sure that the electrodes receive a strong signal from the brain. The EEG technician will measure the person’s head, and they might use a wax crayon to mark where the electrodes should go. The person will relax in a chair or lie on a bed during the test. Including the preparation time, the entire test may take 1 to 1.5 hours. ![]() The EEG test is not invasive, painful, or harmful, and it has no lasting effects.Īccording to the Epilepsy Foundation, the procedure usually lasts approximately 20 to 40 minutes. This cap contains between 16 and 25 flat metal discs called electrodes, which measure the electrical activity of the brain. During an EEG test, a skilled EEG technician will place an electrode cap on the person’s head.
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