Effect of psychological feedback upon work decrement.

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Abstract
The single and joint effects of informational feedback, motivational feedback, and dextro-amphetamine sulfate upon the sustaining of proficiency in a prolonged tracking task were investigated in a factorial experiment involving 144 male subjects. Although the two feedback conditions induced significant increments in task proficiency throughout the 4-hour work period, neither was able to postpone work decrement longer than an hour. By contrast, dextro-amphetamine sulfate (5 mg) was singularly effective in minimizing work decrement throughout the entire period. Significantly divergent task attitudes induced by analeptic and depressant drugs were shown to be unable to account for corresponding divergences in performance.
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