Eleven subjects wore tested on a complex mental task during one-hour exposures to four different dry bulb/wet bulb temperature conditions : 85°/75°, 90°/80°, 95°/85° and 100°/90°F. In a second experiment, ten subjects were tested at 85°/75°, 90°/80°, 110°/90° and 120°/90°F. In both experiments, differences in performance among the temperature conditions were small and not significant.
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W. Dean Chiles (1958) studied this question.