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Electroencephalography is the neurophysiologic exploration of the electrical activity of the brain by the application of electrodes to the scalp.

Richard Caton (1842-1926), a physician practicing in Liverpool, presented his findings about electrical phenomena of the exposed cerebral hemispheres of rabbits and monkeys in 1875.

Hans Berger (1873-1941) began his studies of the human EEG in 1920.

See electroencephalogram.