Machiavellianism is an antisocial interpersonal style involving the use of manipulative, deceptive, and coercive behaviors in the pursuit of self-interest. Although widely studied as a "dark" personality trait in adults, relatively little is known about the developmental correlates of Machiavellian tendencies earlier in life. The present…

Background: Mental health is a priority for high schools, but extant programs often focus on symptom reduction rather than promoting adolescents' developmental assets. Objective: The goal of this study is to examine whether Art in Mind (AIM), a strengths-based after-school organized art activity tailored to fit the needs of adolescents with…

This article presents results from a self-report survey of misconduct behaviours and the stress students (n = 916) experienced at one Canadian community college. Results showed that students engaged in a variety of contract cheating behaviours, and experienced a myriad of stressors both in and outside the college context, including traumatic life…

This study explored the changes in routine and emotional themes experienced by families of children with learning differences or disabilities due to mandatory school closures during COVID-19 in Québec, Canada. A questionnaire was used to compare the family routines of 21 participants before and after the school closures. The study's findings…

Whether high quantities of center-based care cause behavior problems is a controversial question. Studies using covariate adjustment for selection factors have detected relations between center care and behavior problems, but studies with stronger internal validity less often find such evidence. We examined whether within-child changes in hours in…

The study explores whether physical activity (PA) in early adolescence limits the risk of internalizing and externalizing problems in youth with difficult temperaments, from low-income families, or exposed to impaired family functioning. Participants (N = 1312; 53% girls) were drawn from the Quebec Longitudinal Study of Child Development (QLSCD).…

Instability in early childhood education and care (ECEC) arrangements may have detrimental consequences on children's mental health. This study examined ECEC trajectories in the first 30 months of life for 373 children from low-income families in Toronto. We provide information about patterns of instability and reasons for instability. We also…

The present study investigated whether distinct developmental patterns of externalizing behaviors (EBs: hyperactivity-impulsivity, noncompliance, physical aggression) based on parent reports were repeatedly and differentially associated with separate dimensions of internalizing problems such as general anxiety, separation anxiety, and depressive…

The quality of peer attachment in adolescence is an important determinant of psychosocial adjustment. To date, few clear conclusions can be drawn about the most important factors associated with the quality of peer attachment. This study aimed to identify the most important individual and relational factors associated with peer attachment quality,…

School disciplinary climate influences student outcomes. As a result, examining differences in principals' perceptions of disciplinary climate within and across countries and regions may shed some light on decreasing achievement gaps. The quantitative study examined how principals from different geographical locations perceive school disciplinary…

Past meta-analyses show that both child-mother and child-father attachment insecurity are independently and jointly associated with more externalizing behaviors in children. Little is known, however, on the ways that different types of insecure attachment independently and jointly predict the development of externalizing behaviors over time.…

Positive behaviour support (PBS) has been receiving increased attention recently but has not been studied from the perspectives of staff and students in Sweden. This article presents an integrative and systematic literature review focusing on international research concerning staff and student perspectives on the effects of PBS. The aim was to…

Elementary public schools remain the most common venues for addressing children's severe conduct problems. Nevertheless, very few longitudinal studies have examined association between receiving psychoeducational services for conduct problems in school and subsequent conduct problem severity. This study explored if psychoeducational service…

The present study investigated prenatal and early postnatal risk factors associated with developmental patterns of disruptive behaviors (DBs; e.g., hyperactivity-impulsivity, noncompliance, physical aggression) from ages 1.5 to 5 years in a population birth cohort (N = 2,057; 50.7% boys). Six high-trajectory classes obtained by latent growth…

Obsessive-compulsive disorder (OCD) and autism are characterized by the presence of repetitive behaviors. Differentiating between repetitive behaviors attributable to a diagnosis of autism, and those attributable to OCD, poses challenges for differential and co-occurring diagnosis. Differentiation is important to inform appropriate supports and…