Ability-grouping has been studied extensively in relation to children's academic, but not emotional and behavioral outcomes. The sample comprised 7259 U.K. children (50% male) with data on between-class and within-class ability-grouping at age 7. Peer, emotional, hyperactivity, and conduct problems were measured at ages 7, 11, and 14 years.…

Cross-sectional research shows that adolescents' social media use (SMU) and attention deficit hyperactivity disorder (ADHD)-symptoms are related, but it is unclear whether this relation is explained by SMU intensity or by addiction-like SMU problems. Also, due to the lack of longitudinal studies, the direction of this relation remains unknown.…

This study investigates associations between trajectories of children's vocabulary development and subsequent behavioral and emotional difficulties via two potential mediating mechanisms; literacy and peer problems. Nationally representative data from 4,983 Australian children were used to examine trajectories of receptive vocabulary (4-5, 6-7,…

Mobile phones and other wireless devices that produce electromagnetic fields (EMF) and pulsed radiofrequency radiation (RFR) are widely documented to cause potentially harmful health impacts that can be detrimental to young people. New epigenetic studies are profiled in this review to account for some neurodevelopmental and neurobehavioral changes…

Although a negative association between hyperactivity and academic achievement is well documented, little is known about the genetic and/or environmental mechanisms responsible for the association. The present study explored links between parent and teacher ratings of hyperactive behavior problems and teacher-assessed achievement in a sample of…

Study examined peer sensitivity to (1) differences in the social behaviors of hyperactive and normal comparison peers, and (2) medication-related behavioral differences. Discussion focused on children's detection of treatment-related differences in social behaviors of peers, as well as on the imperfect relation between social behavior and social…

Investigated the Type A Behavior Pattern (TABP) in 25 boys of 6-12 years who had attention-deficit hyperactivity disorder (ADHD). ADHD boys obtained higher TABP Total and Impatience- Aggression scores than normal boys. ADHD boys' scores were associated with a wide array of behavior problems and peer difficulties. (RJC)

Used semi-parametric mixture model with boys assessed repeatedly from 6 to 15 years to approximate a continuous distribution of developmental trajectories for aggression, opposition, and hyperactivity. Found that a chronic oppositional trajectory, with other trajectories held constant, led to covert delinquency only. A chronic physical aggression…

Examined nonshared environmental (NSE) influences on twin preschoolers' behavior independent of genetics. Found that within-pair parenting differences correlated with monozygotic differences in behavior. For the extreme 10 percent of the parenting-discordant and behavior-discordant distributions, average NSE effect size was 11 percent, suggesting…

Assessed effects of social risks on psychological adjustment of African American and black South African 6- year-olds. Confirmed poverty and gender as risk factors; but not single-female family headship. Found that poverty and gender posed less risk for South Africans than African Americans. Found gender and national differences in adjustment;…