Four-person groups and single individuals solved a moderately difficult concept-formation problem while working under one of 4 levels of shock-threat induced stress. It was hypothesized that (1) performance, for both individuals and groups, would be related in a curvilinear manner to level of stress, and (2) that groups would have a higher stressor tolerance which would enable them to perform effectively under levels of shock which would prove debilitating for individual performances. Both hypotheses were supported with the qualification for hypothesis 1 that group performance showed no significant variation over stress levels.
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