Now showing items 9-18 of 20265

  • 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 reactive aggression are substantially ...
  • 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. In line with this notion, peer ...
  • 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 requires assessment of ...
  • Genetic and environmental influences on height from infancy to early adulthood : an individualbased pooled analysis of 45 twin cohorts 

    Jelenkovic, Aline; Boivin, Michel; Brendgen, Mara; Dionne, Ginette; Vitaro, Frank; Silventoinen, Karri (Nature Publishing Group, 2016-06-23)
    Height variation is known to be determined by both genetic and environmental factors, but a systematic description of how their influences differ by sex, age and global regions is lacking. We conducted an individual-based pooled analysis of 45 twin ...
  • 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: This study used the monozygotic ...
  • 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 use. A total of 411 (52% boys) ...
  • 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 Study completed inventories ...
  • Twin’s birth-order differences in height and body mass index from birth to old age: a pooled study of 26 twin cohorts participated in the CODATwins project 

    Yokoyama, Yoshie; Jelenkovic, Aline; Sund, Reijo; Sung, Joohon; Hopper, John L.; Ooki, Syuichi; Heikkilä, Kauko; Aaltonen, Sari; Tarnoki, Adam D.; Tarnoki, David L.; Willemsen, Gonneke; Bartels, Meike; Van Beijsterveldt, Toos Cem; Saudino, Kimberly J.; Cutler, Tessa L.; Nelson, Tracy L.; Whitfield, Keith E.; Wardle, Jane; Llewellyn, Clare H.; Fisher, Abigail; He, Mingguang; Ding, Xiaohu; Bjerregaard-Andersen, Morten; Beck-Nielsen, Henning; Sodemann, Morten; Song, Yun-Mi; Yang, Sarah; Lee, Kayoung; Jeong, Hoe-Uk; Knafo-Noam, Ariel; Mankuta, David; Abramson, Lior; Burt, S. Alexandra; Klump, Kelly L.; Ordoñana, Juan R.; Sánchez-Romera, Juan F.; Colodro-Conde, Lucia; Harris, Jennifer R.; Brandt, Ingunn; Nilsen, Thomas Sevenius; Craig, Jeffrey M.; Saffery, Richard; Ji, Fuling; Ning, Feng; Pang, Zengchang; Dubois, Lise; Boivin, Michel; Brendgen, Mara; Dionne, Ginette; Vitaro, Frank; Martin, Nicholas G.; Medland, Sarah E.; Montgomery, Grant W.; Magnusson, Patrik KE; Pedersen, Nancy L.; Dahl Aslan, Anna K.; Tynelius, Per; Haworth, Claire MA; Plomin, Robert; Rebato, Esther; Rose, Richard J.; Goldberg, Jack H.; Rasmussen, Finn; Hur, Yoon-Mi; Sørensen, Thorkild IA; Boomsma, Dorret I.; Kaprio, Jaakko; Silventoinen, Karri (Australian Academic Press, 2016-04)
    We analyzed birth order differences in means and variances of height and body mass index (BMI) in monozygotic (MZ) and dizygotic (DZ) twins from infancy to old age. The data were derived from the international CODATwins database. The total number of ...
  • Validation of an adapted procedure to collect hair for cortisol determination in adolescents 

    Adaption of the collection protocol for hair cortisol determination
    Ouellet-Morin, Isabelle; Laurin, Mélissa; Robitaille, Marie-Pier; Brendgen, Mara; Lupien, Sonia; Boivin, Michel; Vitaro, Frank (Elsevier, 2016-08)
    Introduction In the last decades, cortisol has been extensively studied in association to early exposure to adversity as well as in the etiology of a number of physical and mental problems. While saliva and blood samples allow the measurement of ...
  • 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 and dizygotic twins (336 ...