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Increased mental health difficulties were reported in Canadian children as a result of the Covid-19 pandemic. Accordingly, the pandemic has impacted families as well. The purpose of this thesis was: 1) to examine fluctuations in children’s mental health symptoms and mindful parenting across the 2020-2021 academic year; 2) to examine whether children’s symptoms of inattention and hyperactivity at the beginning of the 2020-2021 academic year were associated with mindful parenting at the end of the academic year; 3) to examine whether children’s depressive and anxiety symptoms at the end of the year moderated this relationship and; 4) to examine how child age and gender affected these relationships. Parents of 114 young children in a large Canadian city participated in this study in the Fall of 2020 and the Spring of 2021. Parents completed several self-report scales used to measure children’s mental health symptomatology and mindfulness in parenting. While there were no significant changes in children’s mental health symptoms or mindful parenting across the time points, children’s symptoms of inattention and hyperactivity were significantly, negatively associated with mindful parenting across the pandemic year, and children’s depressive symptoms moderated this relationship. Specifically, when children’s depressive symptoms were low or average it was found that higher symptoms of inattention and hyperactivity were associated with lower levels of mindful parenting among parents of young girls. Results may inform practitioners about which families require additional support during the pandemic and beyond.

A sizeable proportion of adults suffer from an anxiety disorder and many of those adults are parents. Parental anxiety, as well as dysfunctional family environment, contributes to both internalizing and externalizing problems in children. Specifically, family control, conflict, and cohesion have been shown to predict child internalizing and externalizing symptoms to varying degrees. However, few studies have examined the association between all three components in the same study: parental psychopathology, family environment, and child outcomes. The current study tested the relationships among these variables in a sample of 189 children (66% male, 93% Caucasian, mean age = 10.34 years). Family conflict predicted child externalizing symptoms for both mothers and fathers, and mediated the relationship between maternal anxiety and child externalizing symptoms. Family cohesion predicted child externalizing problems based on maternal report and mediated the relationship between maternal anxiety and child externalizing symptoms. Furthermore, family cohesion moderated the relationship between maternal anxiety and child internalizing symptoms. These findings provide preliminary support for the role of the family environment in the relationship between parental anxiety and child psychopathology, and these environmental variables may be important targets of intervention in families with elevated parental anxiety. / Master of Science

Thèse numérisée par la Division de la gestion de documents et des archives de l'Université de Montréal.

Adolescents with Sluggish Cognitive Tempo (SCT) show symptoms of slowness, mental confusion, excessive daydreaming, low motivation, and drowsiness/sleepiness. Although many symptoms of SCT reflect internalizing states, no study has evaluated the utility of self-report of SCT in an ADHD sample. Further, it remains unclear whether SCT is best conceptualized as a unidimensional or multidimensional construct. In a sample of 262 adolescents comprehensively diagnosed with ADHD, the present study evaluated the dimensionality of a SCT scale and compared CFA and bifactor model fits for parent- and self-report versions. Analyses revealed the three-factor bifactor model to be the best fitting model. In addition, SCT factors predicted social and academic impairment and internalizing symptoms. Therefore, SCT as a multidimensional construct appears to have clinical utility in predicting impairment. Also, multiple reporters should be used, as they predicted different areas of functioning and were not invariant, suggesting that each rater adds unique information.

Although approximately one-fourth of adolescents have a mental health disorder only half of them receive treatment. The goal of this study was to determine if Strong Kids, a social and emotional learning curriculum, implemented over a 4-week period could help decrease internalizing symptoms and increase resilience in middle school students, something not previously investigated. This study also measured social and emotional knowledge as measured by the Strong Kids questionnaire. Additionally, treatment fidelity and social validity were measured. The study used a non-equivalent, control group design. The sample consisted of 148 students: 70 in the treatment group and 78 in the control group. This study was completed using existing data from a title one middle school that implemented Strong Kids. The school had a relatively diverse population and was relatively low SES, with 66% of students receiving free or reduced price school lunch. The Strong Kids curriculum was taught by the school's health teacher to half of the eighth grade students, while the other half received normal state curriculum. Pre and post rating scales were completed by teachers and students on measures of resilience, internalizing symptoms, and social-emotional knowledge. Since there were some differences at pre-test, a 2-by-2 mixed-design analysis of variance and an analysis of covariance were used to analyze results. Results suggested that teacher was able to implement the curriculum with fidelity, with moderate social validity among students and the teacher, and some benefit for at-risk students. While the differences only approached statistical significance, it was likely due to the small sample size of at-risk students. The lack of significant differences between treatment and control classrooms were likely due to confounds. Further, this study suggests that the state curriculum implemented may be effective for general education students. SEL programs like Strong Kids could be used as a targeted approach for students who are at-risk or struggling with internalizing symptoms. Future studies should include randomly assigned students, parent and student ratings, different measures for resilience, a longer intervention period, and follow up data points if implemented over a shorter time frame.

Childhood emotional maltreatment is associated with damaging consequences, although relatively little is known about the mechanisms underlying its effects. This dissertation investigated the concurrent influences of adult attachment and mindfulness on internalizing symptoms and emotional processing in young adults with and without a history of emotional maltreatment. Study 1 revealed that a sequential mediation model, with adult attachment orientations as first-step mediators and mindfulness as a second-step mediator, fit the data better than a simultaneous mediation model. In addition, moderation analyses revealed that high self-reported levels of mindfulness protected against the development of internalizing symptoms, even in at-risk individuals. Study 2 replicated these findings in a new sample, while also extending the results beyond a self-report outcome, using behavioural measures of emotional processing. Emotional maltreatment, adult attachment, and mindfulness predicted the amount of perceptual information required to correctly identify fearful faces and the amount of interference demonstrated in response to positive and negative emotional words. Cumulatively, these findings suggest that childhood emotional maltreatment can disrupt attachment relationships and encumber the development of mindfulness, contributing to internalizing symptoms and the biased processing of emotional information. However, alternative outcomes are possible, given the presence of high levels of mindfulness and secure attachment representations. This has implications for clarifying developmental theories and evaluating clinical interventions that may mitigate the negative effects of childhood emotional maltreatment.

Thèse numérisée par la Division de la gestion de documents et des archives de l'Université de Montréal

abstract: The current study delineated the developmental trajectories of early childhood externalizing and internalizing symptoms reported by mothers and fathers, and examined the role of the 18-month observed parenting quality × Respiratory Sinus Arrhythmia (RSA) interaction in predicting these trajectories. Child sex was tested as a covariate and moderator. It was found that children's low baseline RSA or high RSA reactivity , in comparison to high baseline RSA or low RSA reactivity , was more reactive as a function of early parenting quality when predicting the development of early childhood problem symptoms. Differential patterns of the interaction between parenting quality and RSA were detected for mothers' and fathers' reports. Mother-reported models showed a diathesis-stress pattern, whereas the father-reported model showed a vantage-sensitivity pattern, especially for internalizing symptoms. This may imply the potential benefit of fathers' active engagement in children's early development. In addition, the effect of the parenting quality × RSA interaction in predicting the mother-reported models was found to be further moderated by child sex. Specifically, the parenting quality × baseline RSA interaction was significantly predictive of girls' 54-month internalizing, and the parenting quality × RSA reactivity interaction significantly predicted boys' internalizing slope. Girls with low baseline RSA or boys with high RSA reactivity were vulnerable to the less positive parenting, exhibiting high levels of 54-month internalizing symptoms or slow decline in internalizing over time, respectively. Future research directions were discussed in terms of integrating the measures of SNS and PNS in psychopathology study, exploring the mechanisms underlying the sex difference in parenting quality × RSA interaction, and comparing the findings of children's typical and atypical development. / Dissertation/Thesis / Masters Thesis Psychology 2014