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The electro-encephalogram is the graphic record of electrical disturbances arising in the brain. This record is analogous to the electrocardiogram, which is the record of the electrical action current associated with the contraction of the heart. The first systematic study of electro-encephalograms of human beings was carried out by Berger in the years following 1929.1He established the cerebral origin of these electrical potentials, classified them according to frequency and amplitude and determined the conditions of their appearance and disappearance. He showed further that it was possible to record these phenomena from the intact skull of the conscious human subject. Adrian2also investigated these cortical potentials in both man and animals, and numerous other investigators, including Foerster and Altenburger,3have added significant contributions. Our interest in the subject was aroused by the work of Berger and by the realization that in our electrical amplifiers and oscillographs we
F. A. Gibbs (Sun,) studied this question.