Relations of duration and developmental timing of poverty to children's development from birth to age 9 were examined by comparing children from families who were never poor, poor only during the child's infancy (03 years of age), poor only after infancy (49 years of age), and chronically poor. Chronically poor families provided lower quality…

This longitudinal study evaluated after-school program (ASP) participation and the development of academic performance (school grades, reading achievement) and teacher-rated motivational attributes (expectancy of success, effectance motivation) over a school year. Participants were 599 boys and girls (6.3 to 10.6 years) from an urban,…

The genetic and environmental etiologies of sex-typed behavior were examined during the preschool years in a sample of 3,990 three- to four-year-old twin and nontwin sibling pairs. Results showed moderate genetic and significant shared environmental influence for boys and substantial genetic and moderate shared environmental influence for girls.…

This study addressed gender differences in the developmental links among antisocial behavior, friends' antisocial behavior, and peer rejection. High and increasing, moderate, and low antisocial developmental trajectories were identified among 289 Dutch children, ages 7 to 10, and 445 French-Canadian children, ages 9 to 12. Only boys followed the…

The MacArthur-Bates Communicative Development Inventories (CDI; Dale, 1996; Fenson et al., 1994), parent reports about language skills, are being used increasingly in studies of theoretical and public health importance. This study (N=113) correlated scores on the CDI at ages 2 and 3 years with scores at age 3 years on tests of cognition and…

Cluster analysis was used to identify groups defined by the patterning of fathers' and mothers' sources of knowledge about adolescents' experiences in a sample of 179 families with adolescents (M=16.5 years). Three clusters emerged for fathers (relational, relies on spouse, relies on others) and mothers (relational, questioners, relies on others).…

This study examined whether knowledge of arithmetic contributes to difficulties with equations. In Experiment 1, children (ages 7-11) completed tasks to assess their adherence to 3 operational patterns prevalent in arithmetic: (a) the strategy of performing all given operations on all given numbers, (b) the "operations=answer" problem structure,…

Hypotheses concerning the extent to which adolescents' cognitions mediate the relation between parenting behaviors and adolescent substance use were examined in a panel of African American adolescents (N=714, M age at Time 1=10.51 years) and their primary caregivers. A nested-model approach indicated that effective parenting (i.e., monitoring of…

This longitudinal study investigated the effects of witnessing violence on committing violence among diverse urban middle school students (11-15 years old) over a 1-year period (N=1,599). It examined parent support and prosocial cognitions as moderators that might interact with one another in buffering adolescents from the effects of witnessing…

Using a genetic design of 234 six-year-old twins, this study examined (a) the contribution of genes and environment to social versus physical aggression, and (b) whether the correlation between social and physical aggression can be explained by similar genetic or environmental factors or by a directional link between the phenotypes. For social…

This study examined ways in which children's risk of school failure may be moderated by support from teachers. Participants were 910 children in a national prospective study. Children were identified as at risk at ages 5-6 years on the basis of demographic characteristics and the display of multiple functional (behavioral, attention, academic,…

The federal Early Head Start (EHS) program began in 1995, and a randomized trial was conducted to evaluate the efficacy of 17 EHS programs. In all, 3,001 low-income families (35% African American, 24% Hispanic, and 37% White) with a pregnant women or an infant under the age of 12 months were randomly assigned to a treatment or control group (with…

The main aims of the current research were to determine when children develop a temporally extended self (TES) and what factors contribute to its development. However, in order to address these aims it was important to, first, assess whether the test of delayed self-recognition (DSR) is a valid measure for the development of the TES, and, second,…

This issue of "Early Developments" examines a relatively new phenomenon in the early childhood field called "evidence-based practice," defined herein as "a decision-making process that integrates the best available research evidence with family and professional wisdom and values." This issue of "Early Developments" includes the following articles:…

The unstructured space, running, climbing, sliding, and loud nature of playground time can be overwhelming for children with autism who thrive on predictable and structured routines. As a result, these preschoolers often do not experience the learning and social development benefits from outdoor play seen in their typically developing classmates.…