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To produce an electroencephalograph (EEG), up to 256 electrodes are placed over the skull. They measure changes in the electric field being produced by the brain, and the result is a wave pattern that depends on what the person is doing. An EEG is especially useful for investigating sleep cycles, for diagnosing epilepsy and for studying the relationship between brain activity and mental activity. It is a useful technique, able to detect electrical changes that happen in a few thousandths of a second.

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