LARRY MULVEHILL / SCIENCE PHOTO LIBRARY LARRY MULVEHILL / SCIENCE PHOTO LIBRARY
Young boy about to undergo an electroencephalogram (EEG) examination. This test is performed to record the electrical activity of the brain. Small electrodes are attached to the scalp and then connected to an instrument which measures the brain's impulses in microvolts and records them on a printout. EEG is a painless technique with no side effects and is performed for about forty-five minutes. It may help in the diagnosis of certain conditions such as epilepsy, encephalitis, dementia and brain tumour. It may also be used as a test for brain death.
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