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The genetic and environmental etiology of the association between vocabulary and syntax in first grade
Etiology of vocabulary and syntax
(Taylor & Francis, 2018-03-09)
This study examined the genetic and environmental etiology of vocabulary, syntax, and their association in first graders. French-speaking same-sex twins (N = 555) completed two vocabulary tests, and two scores of syntax ...
Personal and familial predictors of peer victimization trajectories from primary to secondary school
Predictors of peer victimization trajectories
(American Psychological Association, 2016-07)
Using a sample of 767 children (403 girls, 364 boys), this study aimed to 1) identify groups with
distinct trajectories of peer victimization over a six-year period from primary school through the
transition to secondary ...
The spread of substance use and delinquency between adolescent twins
The spread of twin substance use and delinquency
(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 ...
Twin classroom dilemma : to study together or separately?
(American Psychological Association, 2018-07)
There is little research to date on the academic implications of teaching twins in the same or different classroom. Consequently, it is not clear whether twin classroom separation is associated with positive or negative ...
Heterogeneity in the development of proactive and reactive aggression in childhood : Common and specific genetic-environmental factors
(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 ...
Contagion of anxiety symptoms among adolescent siblings : a twin study
(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 ...
How toddlers' irritability and fearfulness relate to parenting : a longitudinal study conducted among Quebec families
Negative emotionality and parenting
(Wiley, 2017-09-28)
Although child difficult temperament is a well‐known risk factor for parenting quality, few studies have focused on the association between specific temperament dimensions and parental behaviours. This study focused on ...
Does cortisol moderate the environmental association between peer victimization and depression symptoms? a genetically informed twin study
(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. ...
Evidence of a unique and common genetic etiology between the CAR and the remaining part of the diurnal cycle : a study of 14 year-old twins
(Elsevier, 2016-04)
Introduction
By and large, studies have reported moderate contributions of genetic factors to cortisol secreted in the early morning and even smaller estimates later in the day. In contrast, the cortisol awakening ...
Persistent genetic and family-wide environmental contributions to early number knowledge and later achievement in mathematics
Etiology of early math knowledge and skills development
(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 ...