Difficulties with the postulated inverted‐U relationship between performance and arousal are discussed, with emphasis upon individual differences in level of arousal. Predictions concerning the behaviour of highly aroused and less aroused subjects are made and tested in two experiments by relating changes in performance associated with increased and decreased levels of arousal to introversion score. Introverts behaved as highly aroused subjects were expected to and extraverts as less aroused subjects.
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D. W. J. Corcoran (1965) studied this question.
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