Two-year-olds' difficulty with rule execution was examined through one of six tasks: a task assessing knowledge about a series of items, a deductive card sort requiring the use of knowledge to sort items by rules, and four modifications of the card sort. Found that the toddlers performed better on the knowledge task than the other tasks. (MDM)

Judgments of similarity among mammals, including humans, were elicited from 7 and 10 year olds and adults. Results partially supported a consensus model of shared cultural knowledge. Patterns of deviation from the model appeared between children and adults because of the emergence of a primate category after age 10. (BC)

Demonstrates the usefulness of the inclusion paradigm as a methodological tool in providing information about the conceptual breadth of selected social and nonsocial superordinate categories in children who exhibit some degree of inclusion logic. (HOD)

Four studies examined developmental differences in the representation of basic-subordinate inclusion relationships in three-, five-, and seven-year olds and undergraduates. Found that even three-year olds showed rudimentary knowledge of the asymmetry of inclusion. There was a marked developmental gap between producing subordinate category names…