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The ability of an optimum duration of inter-task system response times (SRT) to aid users in achieving a perfect readiness for task execution is systematically investigated. Three SRT duration conditions, namely, short, medium and long, were applied in a balanced repeated measures design. Medium SRTs are observed to enable the attainment of optimum readiness for task execution.

The physiological effects of motor activity during typical computer tasks are negligible. Such motor activity affects physiological measures only at a very high typing speed. The physiological effects of computer work are dependent exclusively on mental load at lower levels of motor activity. Skin conductance responses are the most sensitive indicators of the effects of mental load during computer tasks, which appears to be independant of physical demands.