When preschool children think of objects as organized into collections (e.g., forest, army) they solve certain problems better than when they think of the same objects as organized into classes (e.g., trees, soldiers). Present studies indicate preschool children occasionally distort natural language inclusion hierarchies (e.g., oak, tree) into the…

Three experiments tested 3-year-olds' subordinate classification. The first experiment found that novel noun presentation hindered classification. The second and third experiments found that provision of information for the purpose of distinguishing relevant subclasses, and introduction of novel nouns in conjunction with familiar basic level…

Examined the use by children of the Novel Name-Nameless Category principle, under the framework that lexical principles are acquired in a developmental sequence. Results indicated that the particular principle was not available at the start of lexical acquisition but that exhaustive categorization ability and a vocabulary spurt occur…