To date, studies using cross-sectional methodologies make up a majority of the literature surrounding children with autism spectrum disorders and participation in physical activity and screen time. Longitudinal studies are needed to examine how physical activity and screen time behaviors co-develop for children with and without an autism spectrum…

Fragile X syndrome (FXS) is characterized by both social approach and social avoidance. However, the age of emergence and developmental trajectory of social avoidance has not been examined. This study investigates the longitudinal developmental trajectory and dynamic nature of social avoidance in males with FXS from infancy through young adulthood…

This article, using longitudinal data from the National Child Development Study, presents new evidence on the effects of family size and birth order on test scores and behavioral development at age 7, 11 and 16. Sibling size is shown to have an adverse causal effect on test scores and behavioral development. For any given family size, first-borns…

This volume brings together leading authorities from multiple disciplines to examine the relationship between brain development and behavior in typically developing children. Presented are innovative cross-sectional and longitudinal studies that shed light on brain-behavior connections in infancy and toddlerhood through adolescence. Chapters…

The purpose of this study was to test direct, additive, and mediation models involving family, neighborhood, and peer factors in relation to emerging antisocial behavior and social skills. Neighborhood danger, maternal depressive symptoms, and supportive parenting were assessed in early childhood. Peer group acceptance was measured in middle…

Dimensional continuity was examined in adolescents in grades 7, 9, and 11. Demonstrated changes in dimensional configurations raise challenging issues for longitudinal study practices that assume uniform interpretability of the same scales at differing developmental stages. (ST)

Discusses the use of new statistical procedures in a study of the enduring effects of prenatal alcohol exposure upon the neurobehavioral development of some 500 children born in 1975-76. Explains how the Partial Least Squares (PLS) methodology can summarize the data powerfully while avoiding familiar inferential pitfalls. (MDM)

Although recent research suggests that drug misuse involves multiple etiologies, more information is needed to aid in the development of individualized treatment regimens. Individuals with high sensation-seeking (SS) needs do not appear to respond well to traditional counseling approaches. Adolescents (N=584) aged 15 or 18 at time 1 (T1) and 18 or…

Reports the third wave of a longitudinal study that followed 106 15-year-olds from their last compulsory year at school for 22 months. Study shows that this is a period of considerable flux in smoking behavior. Highlights the role of friendship groups and social contexts and suggests that smoking prevention programs should be developed to meet the…

This study involves a two-year longitudinal investigation of adolescent participation in unstructured youth recreation centres and the development of antisocial behaviour. Participants were 1163 adolescents who represented 92% of all eighth-grade students in the town of Orebro, Sweden, during the fall of 1999. Antisocial young people and those…

This document, presented at a symposium on violence and aggression in America, reports a longitudinal study of environmental influences in the development of aggressive behavior. Subjects were 875 third graders when originally assessed with a peer nomination technique in 1960. High, moderate, and low degrees of aggression were identified in the…

Concerning the role of parental smoking on development of adolescent smoking, most studies have exclusively focused on the direct effects of parents' smoking on youths' smoking. However, parental smoking may also play an indirect role by affecting youths' susceptibility to peer influences and by affecting friendship selection. Data were from a…

Over the past 20 years, care reasoning has been increasingly recognised as an important aspect of moral development. Skoe has developed an interview measure of levels of care reasoning about the needs of self and other in relationships, the Ethic of Care Interview or ECI. In the present longitudinal research, we investigated developmental changes…

Data from a 20-year longitudinal study of 125 males and 126 females born to Black teenage mothers in a Baltimore hospital between 1966 and 1968 were analyzed to identify early childhood, middle childhood, and early adolescence determinants of functional literacy. All 251 subjects were interviewed in 1987, and 202 of them completed a document…

Changes from the expected life course can arise from at least three different reasons in longitudinal work: developmental novelty, errors in diagnosis, and errors in expectation. This longitudinal study examined the social development of 220 fourth graders and 475 seventh graders over a period of 10 years with over 98 percent of the original…