Shock source and intensity: Variables in shock-induced fighting

Alternating current, direct current, and rectified alternating current shock were compared at four shock intensities to assess differential influences on shock-induced fighting in rats. At higher shock intensities, the data paralleled the Campbell and Masterson (1969) equal aversion function, but at lower shock intensities, differences among shock types with respect to frequencies of shock-induced fighting were obtained. These results suggested that, at lower shock intensities, shock type is a variable in shock-induced aggression research with rats.