The origins of aggression warrant extensive investigation given its substantial cost to both victims and perpetrators. However, only recently have researchers begun to understand the prevalence and harm associated with relational aggression, which is behaviour intended to damage another person’s feelings, relationships, or social status, such as social exclusion or spreading rumors. Even with this heightened research interest in relational aggression there is a paucity of studies conducted with children prior to age four, the developmental period in which relational aggression begins to emerge. In this dissertation we ascertain what unique lags in development or blossoming capacities coincide with the emergence of both physical and relational aggression during early childhood. In Study 1, we examined differential predictors (sex, age, prosocial behaviour, internalizing problems, and impulsivity) of teacher-rated aggression style (physically aggressive, relationally aggressive, or combined physically and relationally aggressive) among preschoolers (N = 429; M = 41.29, SD = 8.14) using multinomial logistic regression. Being a boy and being higher on impulsivity were both substantial risk factors for use of physical aggression (alone or combined with relational aggression). In Study 2, we explored longitudinal associations between preschoolers’ (N = 126; Mage = 39.15 months, SD = 6.67) assessed language (receptive and expressive vocabulary), parent-rated working memory, and teacher-rated aggression (physical and relational) across one year using an autoregressive cross-lagged panel model. Longitudinally, physical aggression showed stability and both better working memory and previously higher physical aggression predicted higher relational aggression over one year. There were no longitudinal links between language and aggression when simultaneously accounting for working memory in the model, emphasizing the need to account for working memory in this association in future research. In Study 3, using four, separate multivariate multiple regressions, we examined the linear and interactive effects between negative emotionality and several aspects of self-regulation (inhibitory, emotional [soothability], attentional [attention span], and metacognitive [working memory] control) in the prediction of preschoolers’ (N = 198; M = 33.65 months, SD = 5.02) physical and relational aggression. Poorer inhibitory and metacognitive control were associated with higher physical aggression regardless of trait negative emotionality, highlighting the importance of self-regulation rather than emotional reactivity in models of physical aggression. Poorer inhibitory control was also linked to higher relational aggression. Also, negative emotionality was most strongly linked to relational aggression at higher levels of emotional control or attentional control. In summary, the results of the present dissertation support a skill-deficit model of preschool physical aggression (alone or in combination with relational aggression) and both a skill-deficit and developmental advancement model for preschool relational aggression.

Separate externalizing and internalizing pathways to problem drinking have been described. However, internalizing and externalizing are substantially correlated, thus, there is good reason to believe that these two forms of dysfunction behaviors do not operate independently. We tested an integrative developmental model of transactions among internalizing symptomatology, externalizing personality, and psychosocial learning in the prediction of both drinking problems and future internalizing symptoms. To do so, we studied a large sample (n = 1910, 49.9% female) of children over a critical developmental period, from the spring of 5th (last year elementary school) grade through the spring of 9th grade (first year of high school). Using a battery of self-report questionnaires, we assessed demographics, pubertal status, negative urgency, depressive symptoms, positive drinking expectancies, and drinking behavior. Specifically, the present study tested whether internalizing symptomatology (depressive symptoms) in elementary school predicts a classic externalizing pathway ( to problem drinking in middle school, and whether problem drinking in middle school predicts increased depressive symptomatology in highschool. Structural equation modeling yielded significant findings for hypothesized direct and indirect pathways, with overall good model fit (CFI = .94; SRMR = .05; RMSEA = .05, 90% CI .04-.05): elementary school depressive symptomatology predicted middle school drinking problems (mediated by negative urgency and psychosocial learning) and middle school drinking problems predicted increased risk for depressive symptoms in high school, pointing to a reciprocal relationship between internalizing and externalizing dysfunction. The present study incorporated internalizing symptomatology into a traditional externalizing model of drinking risk, and demonstrated a reciprocal relationship between internalizing and externalizing dysfunction during adolescence. These findings are particularly noteworthy when considered in a developmental framework. The present study highlights the need to integrate both internalizing and externalizing forms of dysfunction into models of substance use risk.

abstract: Stress in individuals presents in various forms and may accumulate across development to predict maladaptive physical and psychological outcomes, including greater risk for the onset of internalizing symptoms. Early life stress, daily life experiences, and the stress response of the hypothalamic-pituitary-adrenal (HPA) axis have all been examined as potential predictors of the development of psychopathology, but rarely have researchers attempted to understand the covariation or interaction among these stress domains using a longitudinal design when looking at the influence of stress on internalizing psychopathology. Further, most research has examined these processes in adulthood or adolescence with much less attention given to the influence of these dynamic stress pathways in childhood. Guided by the biopsychosocial model of stress, this study explored early life stress, daily life stress, diurnal cortisol (cortisol AM slope), and internalizing symptoms in a racially/ethnically and socioeconomically diverse sample of twins participating in an ongoing longitudinal study (N=970 children; Arizona Twin Project; Lemery-Chalfant et al. 2013). An additive model of stress and a stress sensitization framework model were considered as potential pathways of stress to internalizing symptoms in middle childhood. Based on a thorough review of relevant literature, it was expected that each stress indicator would individually predict internalizing symptoms. It was also predicted that early life stress would moderate the associations between diurnal cortisol and internalizing symptoms, as well as daily life stress and internalizing symptoms. Multilevel modeling analyses showed that early life stress and cortisol AM slope, but not daily life stress, predicted internalizing symptoms. Early life stress did not moderate the associations between daily life stress and internalizing symptoms or cortisol AM slope and internalizing symptoms. Results support independent additive contributions of both physiological stress processes and early life parental stressors in the development of internalizing symptoms in middle childhood. Future investigation is needed to better understand the sensitizing effects of early parental life stress during this developmental stage. / Dissertation/Thesis / Masters Thesis Psychology 2020

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Strong Kids is a social-emotional curriculum designed to reduce students' externalizing and internalizing symptoms. Strong Kids has shown promise in elementary school, but this was the first study to evaluate the newly updated version of the intervention in a middle school setting. The curriculum was implemented by two general education teachers with students at-risk for emotional and behavioral disorders. A mixed method design was used to evaluate outcomes with eight middle school students. Overall findings suggest that Strong Kids was effective at improving students' social emotional knowledge and internalizing symptoms; however, there were no significant changes in students' externalizing symptoms. Teachers were able to implement the curriculum with fidelity. Teachers and students also found the curriculum to be predominantly positive. Future studies should include a larger sample size, control group, and follow up data points.

Understanding child behavioral outcomes is important because early behavioral issues can lead to negative outcomes that persist throughout the life course. One characteristic that can affect child behavioral outcomes is parental psychological well-being. While there have been many studies describing the effects of parental psychological well-being on child behavior in the US, the nature of this relationship in non-Western countries has yet to be thoroughly explored. There is also limited research that distinguishes between the effects of both maternal and paternal psychological well-being on child behavioral outcomes. Japan is an interesting area in which to examine this relationship due to unique contextual factors that might affect parental psychological well-being, such as Japanese-specific patterns of maternal and paternal involvement. Utilizing regression analysis, this study examines the relationship between paternal and maternal psychological health and child internalizing and externalizing behavioral outcomes using two complementary longitudinal datasets from Japan (JCPS and JHPS). I find that maternal and not paternal psychological well-being is associated with child internalizing and externalizing behavioral problems. This may be a product of fathers in Japan being less engaged in parenting or the intense relationship mothers are encouraged to develop with their children. Further research on this relationship can help in investigating the universality of Western findings related to paternal and maternal psychological health and child behavior.

This study investigated whether core beliefs about the world being safe and predictable (i.e. world assumptions) mediated the association between discrimination and internalizing and substance use problems among individuals from marginalized groups. Path analyses tested mediating effects of four types of world assumptions on the association between discrimination (race-, gender-, and sexual orientation-based) and anxiety, depression, alcohol and cannabis problems in college students (N = 1,181, agemean = 19.50, SD = 1.67). Limited support for mediation by world assumptions was found: among Asian students, race-based discrimination indirectly impacted anxiety symptoms through low perceived controllability of events. Direct effects across groups and discrimination types were also found.

The impacts of childhood stressors are harmful to the emotional and physical well-being of children of all ages. Past research has suggested that children experience increased stress due to change. One subgroup of the United States population that experiences change, is immigrants. Research provides empirical evidence of adolescent immigrant stress but has failed to examine stress experienced by immigrant children at a young age. The present study investigates how immigration status and child immigration generation might impact child stress at a young age using OLS regression. I predict that immigrant children will experience more stress than non-immigrant children and that there will be significant differences in stress between non-immigrant, 1.5 generation immigrant, and 2nd generation immigrant children. Using the 1998 and 2010 cohorts of the Early Childhood Longitudinal Study (ECLS-K 1998 and ECLS-K 2010), I compare non-immigrant and immigrant children in the Kindergarten Wave. Results provide little support for my immigration hypotheses. However, findings suggest that increases in child stress are associated with parent and child health, family structure transitions, and residential movement. Implications of these findings are discussed.

This study examined individual variability in the strength of association between psychophysiological reactivity to trauma cues and clinician-rated PTSD symptoms in a sample of female survivors of sexual and non-sexual assault. PTSD is a heterogeneous disorder, and individual differences in symptom presentation and accompanying comorbidities may be accounted for by internalizing and externalizing latent temperament-based dimensions of psychopathology. The present study proposed that these dimensions may also account for heterogeneity in the association between psychophysiological reactivity and PTSD. Prior research has demonstrated that most individuals with PTSD display elevated psychophysiological reactivity when exposed to trauma reminders, although some do not. As well, research has shown that externalizing pathologies are typically associated with diminished psychophysiological reactivity to aversive cues whereas internalizing pathologies are associated with elevated psychophysiological reactivity. This study therefore employed structural equation modeling to test hypotheses that externalizing and internalizing pathologies would display mitigating and enhancing moderator effects, respectively, on the prediction of PTSD by psychophysiological reactivity. To that end, confirmatory factor analysis first established a viable internalizing and externalizing model based on an array of clinical measures in one participant subgroup (n = 329) and then affirmed the reliability of the model in a second subgroup (n = 245). Structural equation modeling in the latter subgroup, in which PTSD was regressed on Internalizing, Externalizing, and Psychophysiological Reactivity factors as well as Internalizing by Psychophysiological Reactivity and Externalizing by Psychophysiological Reactivity moderator terms, revealed a significant moderator effect for externalizing but not internalizing pathology. However, the nature of the externalizing moderator effect differed from the hypothesized direction, with higher levels of externalizing pathology strengthening the association between PTSD and psychophysiological reactivity rather than weakening it. It therefore appears that variability in the association between PTSD and psychophysiological reactivity may be partially accounted for by individual differences in the externalizing dimension of psychopathology. As well, the psychophysiology of the externalizing dimension may also be marked by heterogeneity, with externalizing pathology being linked with increased rather than decreased psychophysiological reactivity among women who have experienced sexual or non-sexual assault.

Latinx adolescents report higher levels of anxiety and depression symptoms (i.e., internalizing symptoms) compared to other ethnic groups. Research studies primarily conducted with European American youth have concluded that difficulties in emotion regulation and parent-adolescent conflict are associated with an increased risk for youth internalizing symptoms. Additionally, an important Latinx cultural value, familism, has been identified as a protective factor for internalizing symptoms for Latinx adolescents. Therefore, the current study examined how familism, parent-adolescent conflict, and difficulties in emotion regulation interact to influence the development of internalizing symptoms among Latinx adolescents. It was hypothesized that (a) parent-adolescent conflict and difficulties in emotion regulation would be positively correlated with internalizing symptoms, (b) a mediation model of the association between parent-adolescent conflict and internalizing symptoms through difficulties in emotion regulation would be supported, (c) familism would be negatively correlated with internalizing symptoms, and (e) familism would moderate the relation between parent-adolescent conflict and difficulties in emotion regulation. Lastly, this project explored whether familism would moderate the mediation model of the association between parent-adolescent conflict and internalizing symptoms through difficulties in emotion regulation. To test this, data from the Salud de los Adolescentes Latinos study, which recruited Latinx adolescents (N = 92) from Northern Utah, was analyzed. Results from the study showed that higher levels of parent-adolescent conflict, difficulties in emotion regulation, and the future support subscale of familism were associated with an increased risk for internalizing symptoms among Latinx adolescents. Based on previous research, it was predicted that higher levels of familism would be associated with lower levels of internalizing symptoms, showing a protective effect. However, an association in the opposite direction was found, indicating that in this study familism served as a risk factor. In addition, familism did not moderate the association between parent-adolescent conflict and difficulties in emotion regulation nor the mediation model tested from the second study aim. Future studies should investigate the specific risk and protective properties of familism for Latinx adolescents. Findings also indicated that the association between parent-adolescent conflict and internalizing symptoms was partially explained through difficulties in emotion regulation. In other words, higher parent-adolescent conflict was associated with more adolescent difficulties in emotion regulation, which subsequently increased the risk for internalizing symptoms. These findings suggest that parent-adolescent conflict and difficulties in emotion regulation are risk factors for Latinx youth internalizing problems. Therefore, prevention and intervention efforts should target parent-adolescent conflict and difficulties in emotion regulation to reduce the risk for internalizing symptoms among Latinx adolescents.