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.