This study of 2.5 and 3.5 year olds indicated that children of this age do not know many names for solid substances but can be taught names for them; that children represent the names as mass nouns and possibly adjectives; and that there is development of children's nonlinguistic knowledge of substances between the ages of 2.5 and 3 years. (TJQ)

Two experiments examined preschoolers' and adults' relative reliance on visual and verbal information in identification of animals and machines. Findings include both children and adults can use either visual or verbal cues in categorization, and a stricter definition is used in identifying animals. Results suggest that a perceptual to conceptual…