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EDITORIAL 309 Indian Medical Gazette JULY electroencephalography , ^ hat electrocardiography is to the heart ectroencephalography is to the brain : An ^encephalogram, EEG, shows the demonsable brain waves. (These brain waves are-1 , ent from those signifying, in common Psi Jance, sudden emergences of useful ideas, or e supposed mechanisms in telepathy.) The Procedure is perhaps the greatest advance in neurological diagnosis (Hyman, 1946). Various parts of the brain, at rest, produce ^tric currents which can be detected on the ?ca*P, recorded, measured and compared. This 8 done by means of electrodes, amplifiers and