This paper examines the cognitive process of concept development in preschool children, based on recent psychological research. Rather than attempting an exhaustive review of the more than 7000 articles written on children's concepts of categories, the paper highlights and illustrates four key themes that emerge from recent research: first,…

Three experiments investigated the processes by which 2-year-olds acquire the language to express category hierarchies. The first experiment studied how children use current linguistic knowledge to constrain the potential meanings of new words. This experiment compared interpretations of new words given to objects the children could already name…

Two studies investigated how flexible children are when asked to switch from one semantic interpretation to another. Three distinctly different standards for the adjectives "big" and "little" were examined: normative, perceptual, and functional. The first study looked at whether some standards are harder than others to represent and whether…