CHRISTIAN VOULGAROPOULOS, ISM / SCIENCE PHOTO LIBRARY CHRISTIAN VOULGAROPOULOS, ISM / SCIENCE PHOTO LIBRARY
EEG brain study. Woman having the electrical activity of her brain measured by an electroencephalograph (EEG) machine as she lies in a bed. The electrical activity of the brain can be measured through the skull by electrodes placed on the head. This reveals which areas of the brain are most active, which varies depending on the task being performed. Studying the brain by EEG during different tasks and during sleep provides valuable information on how the brain works.
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