This study examined ways in which adolescent attachment security is manifest in qualities of the secure base provided by mother-adolescent relationships among at-risk ninth- and tenth-graders. Findings suggest that security is closely connected to the mother-adolescent relationship via a secure-base phenomenon, in which the teen can explore…

Five studies examined preschoolers' understanding of linguistic form class and pragmatic context in presence of a single exemplar or multiexemplars. Data indicated that by 2 years, children use linguistic form class, and by age 3, use pragmatic context. Young children have begun to understand the distinction between generic and nongeneric noun…

This 3-wave longitudinal study spanning 12 months examined the process by which emotional distress contributes to competence estimation in 9- to 13-year-olds. Findings indicated that emotional distress predicted negative beliefs about the self and the world over time; these beliefs in turn predicted decrements in competence estimation over time.…

Compared 100 three-year-olds with speech delay of unknown origin and 539 same-age peers with respect to 6 speech disorder variables; also examined abnormal hearing in a subset of 279 children. Found significant odds ratios only for low maternal education, male sex, and positive family history; a child with all 3 factors was 7.71 times as likely to…

Followed development of children at family risk for dyslexia from 3 years to 8 years. Found that 66 percent of high-risk group had reading disabilities at age 8 compared with only 13 percent in a control group. However, family risk of dyslexia was continuous. Interpreted findings within a model in which problems in establishing a phonological…

Four studies based on two longitudinal investigations examined the relation between social rejection and increased antisocial behavior. Found that early peer rejection (ages 6 to 8) predicted growth in aggression (at ages 10 to 12); findings were replicated in children ages 5 to 8. Rejection exacerbated antisocial development only among children…

Two cohorts of same-sex twin pairs were assessed on grammar and vocabulary. Findings indicated that vocabulary and grammar correlated strongly at 2 and 3 years in both cohorts, with a consistently high genetic correlation between vocabulary and grammar at both ages. Findings suggest that the same genetic influences operate for vocabulary and…

Examined effects of negative group stereotypes on reasoning about peer retribution (child hits another child in response to name calling) among 2,604 Arab and Jewish adolescents in Israel. Found evidence that Arab and Jewish students hold stereotypes about one another and that in-group bias affected approval and reasoning about peer retribution…

Three studies examined children's understanding of their authority over their self-knowledge. Findings suggest that the shift from reliance on adults to self occurs between 5 and 10 years of age, with parallel development in judging own and other people's self-knowledge. Children between ages 5 and 7 could differentiate between information about…

Assessed effects of sleep restriction and extension on 9- to 12-year-olds' neurobehavioral functioning. Found that modest sleep restriction led to improved sleep quality but to reduced reported alertness. Children who extended sleep improved significantly from baseline their performance on the digit forward memory test and reaction time on the…

Examined relations between reactivity (peak response) and regulation (response dampening) in 6-month-olds' cortisol and behavioral responses to inoculation. Found that reactivity and regulation were unrelated for both cortisol and behavior, suggesting both measures are needed to characterize more accurately infant response to stress. Found…

Data from national sample of 3- to 16-year-olds show that lower test scores and increased behavior problems of children of younger mothers resulted from family background rather than maternal age. For nonfirstborns, maternal age at first birth, not at child's birth, influenced test scores. Disadvantage of children born to younger mothers was…

Used kinematic measures to compare relative contributions of growing body dimensions, age, and walking experience in walking skill development in 9- to 17-month-olds, kindergartners, and college students. Found that with increased age, size, and experience, children's steps became longer, narrower, straighter, and more consistent, reflecting a…

Three studies investigated preschoolers' reasoning about ability. Findings suggested sensitivity to mental state information when judging another child's ability, and they perceived positive correlations between effort and academic success, and "niceness" and high academic ability. Comparisons with 9- to 10-year-olds suggest that preschool…

Examined link between Chinese teachers' beliefs about classroom aggression and withdrawal and their support of middle schoolers, and student behaviors, peer acceptance, and self-perceived social competence. Found that teachers' aversion to aggression and empathy toward withdrawal enhanced self-perceptions of both aggressive and withdrawn children…