Extraversion-introversion and heat-stress tolerance

Ten Ss were tested under heat-stress conditions, during which their physiological stress was measured. Before commencement of the experiment, the Ss' level of extraversion was measured, as well as the meaning they assigned to the situation and the subjective probability of success they gave themselves. It was found that extraverts assigned significantly more positive meaning to the heat-stress situation than introverts, and they tended to estimate their probability of success as higher than did the introverts. However, extraverts tended to suffer from higher physiological stress than introverts, where the main cause for that seemed to be their higher expectations resulting from the positive meaning assigned by them to the heat-stress situation.