Examined infants' ability to retrieve an object from atop a slightly larger object. Found that even 5-month-olds could retrieve objects close in size and fully contiguous with their bases when demands on reaching skill were reduced. Proposed that when they fail this task, it is because they lack the skill to reach the top object without…

Compared outcomes of middle-school-age children born at very low (less than 750-g) or low birthweights (750 to 1,499-g) and full-term. Found that the very-low-weight group fared less well at school age than the low weight and term groups on cognitive functioning, achievement, behavior, and academic performance. Those without neurosensory disorders…

Examined whether differentiating processes existed for 7 composite indices of positive and negative adolescent adjustment in 720 sibling pairs. Found that siblings born 1 year apart at Time 1 were more similar to each other than were siblings born 2 years apart, suggesting that shared environmental influences counteract sibling differentiation…

Used Wynn's (1992) procedure in 3 experiments to test 5-month-olds' looking-time reactions to correct and incorrect results of simple addition and subtraction transformations. Found non-systematic evidence of either imprecise or precise adding and subtracting in young infants. Results suggest that infants' reactions to displays of adding and…

Maintains that findings showing numerical computation abilities in infants are considerably more robust and consistent than Wakeley, Rivera, and Langer suggest. Asserts that all the interim replication attempts have successfully replicated Wynn's original findings. Discusses possible reasons for failure to replicate in Wakeley et al. experiments.…

Examined in 4 experiments 2-year-olds' knowledge of solidity in search tasks. Found no evidence that 2-year-olds represented solidity and support constraints on trajectories of falling objects; two experiments included 2.5-year-olds who succeeded on search tasks. Explored implications of 2-year-olds' poor performance in light of very young…

Four experiments investigated 3-year-olds' understanding of the differential importance of shape for categorizing solid objects. Found that they categorized rigid and deformable objects differently in a non-naming task and knew that material was important for deformable items and shape for rigid items. In two naming tasks, they generalized names…

Assessed word-learning skills of 19 deaf/hard-of-hearing preschoolers either with novel mapping strategy to learn new words, or after minimal exposure when reference was explicitly established. Found that 11 children were able to learn words in both contexts, 5 only in the second, and 2 in neither. The latter 7 children eventually were able to…

Interviewed 145 children between ages 4 and 12 years within days or months after an alleged incident of sexual abuse. Found that the proportion of substantive investigative utterances eliciting new details increased with age and decreased after delays of more than 1 month. Age related to length and richness of informative responses. (Author/KB)

Examined connections between having a sister versus a brother and coming from a same-sex versus an opposite-sex sibling dyad, and sex-typing in adolescents' friendships. Findings suggested that sisters may learn control tactics from brothers that they apply in friendships. Boys were less likely to model emotional intimacy. Coming from opposite-sex…

Compared adolescent siblings' evaluations of parental treatment. Found support for a moderating effect for self-esteem and emotionality but not gender. Evidence of the "sibling barricade" effect was limited and interpreted as reflecting a sibling comparison process. For older siblings, emotionality and self-esteem moderated the sibling barricade…

Explored the antecedents of the ambivalent attachment pattern in Israeli infants. Found that mothers of ambivalent infants showed lower education level, higher separation anxiety, and higher parenting stress than mothers of secure infants. Infants' perceived difficult temperament did not discriminate between the two groups. Longer maternal work…

Examined association of three maternal regulating behaviors with children's positive and negative behaviors toward siblings in 40 Japanese families. Observed maternal regulating behaviors more frequently when younger sibling was still in early developmental stage. Older siblings' negative behaviors toward younger positively correlated with…

Examined processes involved in the relationship of early adolescents' appraisals of interparental conflict with adjustment problems in two samples. Found that perceived threat mediated association between interparental conflict and internalizing problems in both samples; self-blame mediated this association for boys in both samples and girls in…

Compared conceptual models examining the role of improved parent-child relationships in the relations between mentoring partnerships and academic outcomes of adolescent applicants to Big Brothers Big Sisters programs. Found that mentoring led to reduced unexcused absences and improved perceived scholastic competence. Mentoring effects were…