Speed and Load Stress in a Sensori-Motor Skill

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Abstract
An experiment is described to study the effects of time and load (as speed) upon skill. Twenty subjects did the same task, which demanded adaptation to a continuously changing situation, under 3 different conditions of load and at 5 different speeds for each load. The number of signals not responded to at all bears a logarithmic relationship to the rate at which they are presented. At any one speed the incidence of this type of error depends markedly on the load content of the display. Statistical interaction between speed and load effects was demonstrated. Of the responses made, the size of errors of timing was not affected by the speed of the task. Doubling the load almost doubled the timing error.

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