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Recognizing emotional expressions across different people and discriminating between them are important social skills. We examined their development using a novel free-sorting task in which children (aged 5 to 10) and adults sorted 20 faces (posing sadness, anger, fear, and disgust) into piles such that all faces in each pile were feeling the same. Participants could make as many or few piles (emotion categories) as they liked and then labeled each pile. There were no age-related changes in the number of piles made. Children made more confusion errors (two emotions in the same pile) than adults, a pattern that decreased with age. Errors were not random, but disproportionately involved placing fearful faces into piles labeled sad and disgusted faces into piles labeled angry-especially among children who did not produce fear and disgust labels, respectively. Our findings are consistent with differentiation and constructivist models of the development of emotion perception. (PsycInfo Database Record (c) 2022 APA, all rights reserved).