ABSTRACTAn analog computer model of the endosomatic galvanic skin response has been constructed from a theoretical interpretation of end organ function and has been used to study some of the parameters of a response consisting of two opposing components. The results demonstrate that the interaction between the faster negative component and the slower positive component can produce triphasic patterns as well as alterations in maximum deflection and rates of rise and decay. The character and degree of alteration of the negative component is shown to be heavily dependent on the amplitude and time delay of the positive component. The possible application of this model in the development of an automatic analyzer is considered.GSR, Endosomatic, Electrodermal potential. Wave form. Analog computer. Simulation. (D. L. Holmquest)