One hundred 18-month-olds were tested using sequential touching and following 4 different priming contexts using sets of toys that could be simultaneously categorized at either the basic or global level. An exact expression of the expected mean sequence length for arbitrary categories was derived as a function of the number of touches made, and a…

This study examined reactions of 1-year-olds and young 2-year-olds to being controlled by mothers. Mothers' supportive behavior predicted children's willing compliance. However, contrary to research with older children, defiance was also associated with variables linked to maternal competence, specifically, mothers' supportive behavior,…

This longitudinal study combined, in a single study, different aspects of children's knowledge about mental phenomena and thus could investigate relations among the development of language, theory of mind, and later metamemory. In total, 183 German children were tested at ages 3, 4, and 5. Each time of testing included a set of theory-of-mind…

The perceived spatiotemporal continuity of objects depends on the way they appear and disappear as they move in the spatial layout. This study investigated whether infants' predictive tracking of a briefly occluded object is sensitive to the manner by which the object disappears and reappears. Five-, 7-, and 9-month-old infants were shown a ball…

Two studies found infants' scores on the Range of State Cluster of the Neonatal Behavioral Assessment Scale with Kansas Supplements to correlate significantly with visual discrimination performance at three months of age. The correlation with behavioral state organization contradicted the prediction that orientation scores would predict visual…

Studied the early development of inhibited approach through the observation of 48 infants. Subjects (aged 6.5, 10, and 13.5 months) were observed longitudinally as they reached for toys under high- and low-novelty/intensity conditions. Predictions that temperament would affect reaching behavior (with happy children reaching more quickly and…

Although research has clearly established that low family income has negative impacts on children's cognitive skills and social-emotional competence, less often is a family's experience of material hardship considered. Using the Early Childhood Longitudinal Study, Kindergarten Class of 1998-1999 (N=21,255), this study examined dual components of…

This study examines frequency, overlap, and genetic and environmental influences on sleep difficulties, which are understudied in school-aged children. The Sleep Self Report and the Children's Sleep Habits Questionnaire were completed by 300 twin pairs (aged 8 years) and their parents. Child report suggested more frequent sleep problems than…

Investigated infants' integration of visual information across space and time. In four experiments, infants aged 12 months and 6 months viewed objects after watching light trace similar and dissimilar shapes. Infants looked longer at novel shapes, although six-month-olds did not recognize figures taking more than 10 seconds to trace. One-year-old…

Investigated the development of social referencing (children's looks toward parents, instrumental toy behaviors, affective expressions, etc.) in 40 infants aged 6-9, 10-13, and 14-22 months. Results indicated that looking behavior of younger children may function differently from that of older children, and social referencing involves a number of…

Children aged 14 and 24 months were shown television depictions of adults manipulating toys in novel ways. Infants at both ages showed imitation of television models, even after 24-hour delays. This deferred imitation has social and policy implications as it suggests that television viewing can potentially affect infant behavior and development…

Research on multiracial individuals is often cross-sectional, obscuring the fluid nature of multiracial self-categorization across time. Pathways of racial self-identification are developed from a nationally representative sample of adolescents aged 14-18, measured again 5 years later. A significant proportion of multiracial adolescents change…

Data from several studies indicated that most children understood what they were asked to do in psychological studies. Few under the age of 12 years believed their performance would be confidential. Many children believed there would be negative consequences if they ended their participation. Parental permission added pressure on children to…