Current Distribution in the Brain From Surface Electrodes

N CONTEMPORARY medical research, many I examples are found, particularly in the fields of electroanesthesia, electrosleep, electrotherapy, and brain hemodynamics, of the application of electric currents to the surface of the head. In each of these examples, the objectives can be achieved only if the current passes through the skull into the brain. It is apparent that the amount and distribution of current entering the brain is of great consequence. Yet the literature discloses no systematic mathematical or experimental method for predicting current flow.