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Persistence and innovation effects in genetic and environmental factors in negative emotionality during infancy : a twin study

Schumann, Lyndall; Boivin, Michel; Paquin, Stéphane; Lacourse, Éric; Brendgen, Mara; Vitaro, Frank; Dionne, Ginette; Tremblay, Richard Ernest; Booij, Linda (Public Library of Science, 2017-04-27)

Background Difficult temperament in infancy is a risk factor for forms of later internalizing and externalizing psychopathology, including depression and anxiety. A better understanding of the roots of difficult temperament ...

Environmental influence of problematic social relationships on adolescents' daily cortisol secretion : a monozygotic twin-difference study

Brendgen, Mara; Ouellet-Morin, Isabelle; Girard, Alain; Lupien, Sonia; Vitaro, Frank; Dionne, Ginette; Boivin, Michel (Cambridge University Press, 2017-02)

BACKGROUND: This study investigated the potential environmental effects of peer victimization and the quality of relationships with parents and friends on diurnal cortisol secretion in mid-adolescence. METHOD: ...

Persistent genetic and family-wide environmental contributions to early number knowledge and later achievement in mathematics

Etiology of early math knowledge and skills development

Garon-Carrier, Gabrielle; Boivin, Michel; Kovas, Yulia; Feng, Bei; Brendgen, Mara; Vitaro, Frank; Séguin, Jean; Tremblay, Richard Ernest; Dionne, Ginette (SAGE, 2017-10-03)

This study investigated the stable and transient genetic and environmental contributions to individual differences in number knowledge in the transition from preschool (age 5) to Grade 1 (age 7) and to the predictive ...

The spread of substance use and delinquency between adolescent twins

The spread of twin substance use and delinquency

Laursen, Brett; Hartl, Amy C.; Vitaro, Frank; Brendgen, Mara; Dionne, Ginette; Boivin, Michel (American Psychological Association, 2017-02)

This investigation examines the spread of problem behaviors (substance use and delinquency) between twin siblings. A sample of 628 twins (151 male twin pairs and 163 female twin pairs) drawn from the Quebec Newborn Twin ...

Contagion of anxiety symptoms among adolescent siblings : a twin study

Serra Poirier, Catherine; Brendgen, Mara; Vitaro, Frank; Dionne, Ginette; Boivin, Michel (Wiley, 2017-03)

This study examined whether social contagion of anxiety symptoms is present between siblings during early adolescence and whether this process is moderated by sex, relationship quality, and zygosity. Based on 634 monozygotic ...

Links between the mother-adolescent and father-adolescent relationships and adolescent depression : a genetically informed study

Links between the parent-adolescent Relationship quality and depression

Brouillard, Charlie; Brendgen, Mara; Vitaro, Frank; Dionne, Ginette; Boivin, Michel (Taylor & Francis, 2017-08-18)

This study examined the unique roles of support and conflict in the relationship with the mother and the father in predicting changes in adolescents’ depressive symptoms over a 1- year period. Potential moderating effects ...

Developmental pathways linking childhood temperament with antisocial behavior and substance use in adolescence : explanatory mechanisms in the peer environment

Temperament, peer social processes and antisocial behavior & substance use

Buil, J. Marieke; Van Lier, Pol A. C.; Brendgen, Mara; Koot, Hans M.; Vitaro, Frank (American Psychological Association, 2017-06)

This study investigated three developmental pathways involving the peer environment that may explain how certain temperamental dispositions in childhood may become manifested in later antisocial behavior and substance ...

Problem gambling among adolescents : a longitudinal empirical investigation of the pathways model of problem gambling

Pathways model investigation among adolescents

Allami, Youssef; Vitaro, Frank; Brendgen, Mara; Lacourse, Éric; Tremblay, Richard Ernest (Springer, 2017-12-31)

The pathways model of problem gambling suggests the existence of three developmental pathways to problem gambling, each differentiated by a set of predisposing biopsychosocial characteristics: behaviorally conditioned (BC), ...

Heterogeneity in the development of proactive and reactive aggression in childhood : Common and specific genetic-environmental factors

Paquin, Stéphane; Lacourse, Éric; Brendgen, Mara; Vitaro, Frank; Dionne, Ginette; Tremblay, Richard Ernest; Boivin, Michel (Public Library of Science, 2017-12-06)

Background Few studies are grounded in a developmental framework to study proactive and reactive aggression. Furthermore, although distinctive correlates, predictors and outcomes have been highlighted, proactive and ...

Does cortisol moderate the environmental association between peer victimization and depression symptoms? a genetically informed twin study

Brendgen, Mara; Ouellet-Morin, Isabelle; Girard, Alain; Lupien, Sonia; Vitaro, Frank; Dionne, Ginette; Boivin, Michel (Elsevier, 2017-10-31)

Many youths who are victimized by peers suffer from depression symptoms. However, not all bullying victims become depressed and individuals’ biological sensitivity may play an important moderating role in this regard. ...