Longitudinal data from a large sample of twins participating in the Netherlands Twin Register (n = 42,827, age range 3-16) were analyzed to investigate the genetic and environmental contributions to childhood aggression. Genetic auto-regressive (simplex) models were used to assess whether the same genes are involved or whether new genes come into…

Callous-unemotional (CU) traits have proven important for designating children and adolescents showing a pattern of particularly severe, stable, and aggressive antisocial behaviors (Frick, Ray, Thornton, & Kahn, 2014). Individuals with secondary CU traits represent a subpopulation that are distinguished from those with primary CU traits by…

Many mothers work in jobs with nonstandard schedules (i.e., schedules that involve work outside of the traditional 9-5, Monday through Friday schedule); this is particularly true for economically disadvantaged mothers. In the present article, we used longitudinal data from the Fragile Families and Child Wellbeing Survey (n = 2,367 mothers of…

This study (a) compared native Finns and immigrant children with respect to different forms of peer victimization and (b) tested whether intrapersonal (e.g., depression) and interpersonal (e.g., peer rejection) risk factors help to explain the association between immigrant status and peer victimization. The sample was drawn from the first phase of…

The purpose of the present investigation was to examine the association between circadian rhythms of cortisol and physical and relational aggression. Morning arrival, prelunch, and afternoon predeparture salivary cortisol were assessed among 418 maltreated and nonmaltreated children (52% maltreated; 49% female) attending a summer day camp.…

In a 19-year longitudinal study, the 15% most inhibited and the 15% most aggressive children at ages 4-6 years were followed up until age 23 years and were compared with controls who were below average in preschool inhibition or aggressiveness. As adults, inhibited boys and girls were judged as inhibited by their parents and showed a delay in…

The authors examined the role of familial risk and child characteristics in the association between the type of child care in infancy (maternal care [MC]) versus nonmaternal care [NMC]) and emotional/behavioral difficulties at 4 years old. Canadian families (N=1,358) with children between 1 and 12 months old were followed over 4 years. Family…

A short-term cognitive mediation training intervention program designed to alter the social-cognitive basis for aggressive behavior of adolescent aggression offenders was found to increase social problem-solving skills, reduce endorsement of beliefs supporting aggression, and reduce aggressive, impulsive, and inflexible behavior. (RH)

This study investigated the role of context in mothers' interventions in their preschoolers' peer relationship problems. In response to a series of videotaped vignettes depicting common peer relationship problems, mothers suggested using more discussion in aggressive situations and more encouragement in initiating play situations. Mothers would…

Consistent with results of research with toddlers, abused preschoolers exhibited more inappropriate responses toward distressed peers, and were more likely to cause distress of peers, than were nonabused peers. Inappropriate responses of abused children persist beyond toddlerhood, despite experiences with nonabusive caregivers and nonabused peers.…

Examined the relation between a history of maltreatment and cognitive control functioning in two groups of preschool and early school-age maltreated and nonmaltreated children. Maltreated children showed developmentally impaired cognitive control functioning on a number of tasks. (RH)

Data from a 25-year study of 194 individuals indicated that teacher and peer reports of aggression, compliance, and self-control at age 8 distinguished high-agreeable from low-agreeable 33-year-olds. High-agreeable childhood types had fewer disobedience and concentration problems than low-agreeable childhood types. High-agreeable childhood boys…

Examined relationships among parenting, sibling aggression, and peer outcomes in 8- to 10-year old boys, their siblings, and mothers. Found that siblings with more rejecting mothers were more aggressive with one another than siblings with less rejecting mothers. Boys with more aggressive sibling interactions were more likely to be nominated by…

Examined longitudinally the relationship between biological and social risk factors and aggressive behavior patterns among high-risk Australian adolescents in three groups: early-onset persistent aggression, adolescent-onset aggression, and nonaggressive behavior groups. Findings revealed that the interaction of biological and social risk factors…

Examined developmental trajectories toward violence over middle childhood and children's response to a universal school-based preventive intervention. Found that three growth patterns--positive linear, late acceleration, and gradual deceleration--characterized the children's trajectories, and these trajectories varied meaningfully by child…