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Two laboratory experiments were conducted to investigate the behavioral consequences of adaptation to repeatedly presented aversive noise. Experiment I showed that among a group of college females, the work of adapting to unpredictable, in contrast to predictable, noise resulted in lowered tolerance for frustration and in impaired performance efficiency after termination of the noise. These effects were more pronounced when the unpredictable noise was delivered at 110 decibels compared to 36 decibels. The behavior of subjects in both predictable-noise conditions did not differ significantly from no-noise control subjects. Experiment II showed that the adverse postadaptive effects following loud unpredictable noise were substantially reduced if the subject believed he had control over the termination of the noise. The effects of cognitive factors on postadaptive responses to noise were discussed, and several theoretical interpretations of the results were offered.

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A study was conducted to test the hypothesis that Type A (coronary-prone) individuals would show greater suppression of subjective fatigue than Type B (non-coronary-prone) individuals in order to persist at a tiring but challenging task. Type A and Type B college students completed a Balke treadmill test (at a walking pace) while rating their fatigue at 2-minute intervals. Each subject also completed another treadmill test (at a running pace) that was designed to assess maximum aerobic capacity. Subjects' aerobic capacities and their aerobic performance levels attained on the Balke test were determined by analysis of expired air. Each subject's walking performance was scored as a proportion of his maximum aerobic capacity. Analysis of the resulting percentage values indicated greater effort among A's than B's. Moreover, the subjective fatigue ratings of A's were lower than those of B's. The results were discussed in terms of fatigue suppression as an instrumental response for attaining mastery over the environment. consideration was also given to the role of fatigue in the onset of coronary heart disease.