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Four studies with 256 undergraduates showed that positive affect, induced in any of 3 ways, influenced categorization of either of 2 types of stimuli—words or colors. As reflected by performance on 2 types of tasks (rating and sorting), Ss in whom positive affect had been induced tended to create and use categories more inclusively than did Ss in a control condition. On one task, they tended to group more stimuli together, and on the other task they tended to rate more low-prototypic exemplars of a category as members of the category. Results are interpreted in terms of an influence of affect on cognitive organization or on processes that might influence cognitive organization. It is suggested that borderline effects of negative affect on categorization, obtained in 2 of the studies, might result from normal people's attempts to cope with negative affect.(32 ref)(PsycINFO Database Record (c) 2016 APA, all rights reserved)