Brain death. Coloured Electroencephalograph (EEG) showing brain death. The eight brainwaves are flat as there are no electrical impulses being produced by the brain. To obtain an EEG, various electrodes (dots on the heads at right) are attached to the scalp. The difference in readings between pairs of electrodes is computed to produce averaged results shown as the brainwaves. Brain death occurs when the entire brain has stopped functioning. An EEG can help to diagnose brain death in situations where the patient's heart and lungs are being kept working by a life support machine.
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