As screen time (ST) constitutes an integral part of the daily lives of young children today, parents, educators, and researchers have started to explore the associations of ST with children’s cognitive, behavioral, and social outcomes. The majority of existing studies have primarily focused on the duration of ST in relation to these outcomes despite the importance of other aspects such as content and type of device in the context of an evolving digital landscape marked by high mobility, ubiquity, and diversity. Addressing this gap, the current study aimed to explore the intricate relations between multiple aspects of ST (i.e., duration and content), executive function (EF) difficulties, and school adjustment in school-aged children, with a particular focus on the mediating role of EF difficulties linking the relations between ST and school adjustment. The current study employed data from the Panel Study on Korean Children, tracking 1,484 South Korean children from third to fourth grade. The duration of ST was measured by the average daily hours spent on smart devices and computers. Parent reports of the levels of engagement in recreational and educational ST and EF difficulties were assessed on Likert scales. School adjustment was reported on by teachers. The results from a half-longitudinal mediation model demonstrated that more frequent engagement in educational ST was related to fewer EF difficulties, which was in turn associated with better school adjustment. The current findings suggest that multiple approaches are needed to effectively guide children’s ST use in their everyday lives and interventions that target EF might be an effective way to promote children's behavioral and social adjustment in school settings.

Parental depression is a risk factor for children’s healthy language development, however, the mechanisms of risk transmission are less understood. The present study aimed to examine aspects of parent-child interactions as mediators of the negative relations between mothers’ and fathers’ depression and children’s expressive language. Using longitudinal data from families in a large city of the Western United States (N = 497; child Mage = 5.83 months; 47% female), I examined these relations using mothers’ and fathers’ reports of depression, observations of mothers’ and fathers’ parent-child interactions, and observational indices of children’s expressive language in the home. Although results indicated no longitudinal relations between mothers’ or fathers’ depression and children’s expressive language, mothers’ depression was negatively related to mothers’ and fathers’ later parental supportiveness. Moreover, mothers’ acceptance and fathers’ supportiveness were positively related to children’s later expressive language. These findings shed light on family dynamics when mothers’ experience heightened levels of postpartum depression and how specific parent-child interactions support healthy language development.

The main purpose of this thesis was to further explore factors that render particular children more susceptible to bullying and peer victimization. Race, age, and the activities that the children participated in were considered potential predictors of bullying and victimization. Self- and peer-reported data were gathered on 437 first and third grade children (234 boys and 203 girls, M age = 7 years, 6 months), including the frequency of peer victimization and the extent of their engagement in gender-typed activities. Activities were identified as either masculine (e.g., watching sports on television, playing with tools) or feminine (e.g., playing house, cheerleading) according to which sex was mostly likely to engage in them. Mixed support was obtained for the hypothesis that boys are at greater risk for being targets of peer aggression. Specifically, while peer-reports of victimization supported this hypothesis, self-reports revealed no sex differences. Support was obtained for the hypotheses that engaging in cross gender-typed activities would be a stronger risk factor for peer victimization for boys than for girls.

This longitudinal study examines the relations of anger, gender, and intrusive maternal parenting to empathy in toddlers. Participants (247 toddlers at the initial assessment) were assessed in a laboratory at approximately 18 (T1, N = 247), 30 (T2, N = 216), and 42 (T3, N = 192) months of age. Toddlers' observed anger was measured during a toy removal task and maternal intrusiveness was observed during free play between mother and toddler. Reported empathy was measured using questionnaires completed by mothers and fathers. At 18 months, a positive relation between observed anger and reported empathy was found for boys, but not for girls. At 30 months, maternal intrusiveness positively predicted empathy in boys, but it negatively predicted empathy in girls. These findings provide insight about sex differences in the development of empathy and concern for others in early childhood.

This dissertation used the risk and resilience framework to examine the associations between perceived racial discrimination, family racial socialization, nativity status, and psychological distress. Regression analyses were conducted to test the links between perceived racial discrimination and psychological distress and the moderation on these associations by family racial socialization and nativity status. Results suggest, for U.S.-born adolescents, cultural socialization strengthened the relation between subtle racial discrimination and anxiety symptoms. In addition, promotion of mistrust buffered the relations of both subtle and blatant racial discrimination on depressive symptoms. For foreign-born adolescents, promotion of mistrust exacerbated the association between blatant racial discrimination and depressive symptoms. Overall, the findings revealed the detrimental effects of perceived racial discrimination on the mental health of Asian American adolescents, how some family racial socialization strategies strengthen or weaken the relation between perceived racial discrimination and psychological distress, and the different ways foreign-born and U.S-born adolescents may interpret racial discrimination and experience family racial socialization.

The purpose of this study was to examine the longitudinal relations of maternal behaviors, children`s temperamental negative emotionality, and children`s emotion perception processes, including emotion perception accuracy (EPA) and emotion perception bias (EPB), to children`s conduct disorder symptoms in a normative sample. Separate structural equation models were conducted to assess whether parenting or children`s proneness to negative emotions at 24-30 (T2), 36-42 (T3) and 48-54 (T4) months predicted children`s EPA and EPB over time, and whether T3 and T4 children`s emotion perception processes were predictive of children`s conduct disorder at 72 months of age (T5). None of the hypothesized longitudinal relations was supported; however, other noteworthy results were observed. T3 children`s proneness to negative emotions was positively related to children`s concurrent bias toward anger. The latent constructs of negative parenting, children`s proneness to negative emotions, and the observed measure of children`s emotion perception accuracy showed stability over time, whereas the observed measures of children`s bias toward understanding distinct negative emotions were unrelated across time. In addition, children`s expressive language was predicted by children`s earlier emotion perception accuracy, which emphasized the importance of improving children`s emotion understanding skills during early years. Furthermore, the previously established negative relation between EPA and EPB variables was only partially supported. Findings regarding the relations between parenting, children`s negative emotionality and emotion perception processes are discussed from a developmental perspective.