The authors discuss the origins of categorical representations in young infants, using recent evidence on the categorization of animals. This evidence suggests that mature conceptual representations for animals derive from the earliest perceptually based representations of animals formed by young infants, those based on the surface features characteristic of each species, including humans. The shift from perceptually to conceptually based representation is a gradual and continuous process marked by initial, relatively simple, perceptually based representations coming to include more and more specific values of common animal properties. Development is thus a process of enrichment by perceptual systems, including that for language, and without the need of specialized processes that alter the nature of human thought and the representation of human knowledge.
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