The physiological effects of multiple stressors

In psychophysiological experimentation a number of studies have investigated the physiological response to a single stimulus or to a series of stimuli differing only in intensity. They have, in general, reported sympathetic-like changes in a wide range of physiological variables to such diverse stimuli as electric shock, loud noise, dynamometer tension, acceleration, and thermal stimulation. The purpose of this experiment was to compare the physiological effects obtained in a multiple stressor condition to the effects obtained in two single stressor conditions.