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Electroencephalography. Doctor monitoring a young boy's brain activity (brain waves) using an electroencephalography (EEG) machine. A technician is checking the position of a number of small electrodes taped to the boy's scalp. The electrodes detect the tiny electrical impulses produced by the activity of the brain. The brain waves are being displayed as graphs on the monitor. Characteristic brain wave patterns on the screen can be used to help diagnose medical conditions such as epilepsy, encephalitis, dementia, brain tumours and brain death.
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