Examined the extent to which maternal linguistic input enabled children to use syntactic bootstrapping. Studied uses of 25 common verbs in speech of 57 mothers to their 1-year olds and 2-year olds. Found that verbs can be used to create informative syntactic frames, syntactic frames can cue appropriate verb class, and multiple syntactic framing…

Preschoolers through second graders were given an opportunity to help another child obtain toys. Help that required a specific form of affective attribution and reconciliation was found to be related to the affective attribution and reconciliation measures when the demands of the helping opportunity matched the social cognition measure demands.…

Examines theoretical issues concerning the development of and the unity or diversity underlying private speech and studies the developmental progression of private speech in a low-income, culturally different sample. The effects of age, sex, environmental context, and the relationship of social speech to varieties of private speech are also…

Examined perception of object unity in partial occlusion in 72 infants. Recorded how long subjects looked at a display of complete and incomplete rods. In test and control conditions, infants looked longer at broken rods than at complete rods, suggesting that infants' cognitive, visual, or attentional skills may be insufficient to support…

Used observations and home visits to examine sex differences in language ability of 54 disadvantaged children at risk for poor language outcomes. Found that language difficulties increased over time, boys were at a constant disadvantage to girls in language development, and sex difference in language ability appeared even when families had similar…