Appearance-related self-esteem is a facet of body image that encompasses the evaluative components of an individual's self-concept that pertains to their own physical appearance. Knowledge regarding how appearance-related self-esteem functions in adolescent social groups is scant in the literature and there is limited research using linear methods suggesting that adolescents can influence the appearance-related self-esteem of their peers. Given the negative consequences of negative feelings about one's appearance later in life, I examined how appearance-related self-esteem develops and relates to adolescent social processes during the transition to middle school. This dissertation investigated how appearance-related self-esteem related to the social processes of selection, similarity, and influence. I further explored the effect of gender on social processes and appearance-related self-esteem. Appearance-related self-esteem was not related to social processes of selection, similarity, or influence. Gender similarity was present in the network, such that adolescents were more likely to select same-gender peers than other-gender peers. Additionally, an effect of gender on appearance-related self-esteem was present, such that boys' appearance-related self-esteem increased over time more than girls'. Findings from the current dissertation provide foundational first steps in identifying the ways that peers impact appearance-related self-esteem during adolescence and provide insights toward understanding how different gender pathways around appearance-related self-esteem may develop over time.

Academic tracking has long been a subject of debate due to its potential impact on educational equity, with students who are tracked highly receiving a higher quality education in comparison to students tracked lowly. These disparities in education quality may be affecting students’ outcomes, as it has been demonstrated that the short-term academic outcomes of students, such as their grades, tend to be affected by their academic track positioning. This dissertation builds upon these previous findings by utilizing a subsample of 20,584 students from the High School Longitudinal Study (2009) to examine the relation between academic track positioning and post-secondary education attendance, program length, college major, and expected future job. Additionally, the relation between academic tracking and each of these outcomes was also assessed using mediation, with potential mediators including education aspiration, expectations, and academic self-efficacy. Findings suggest that academic track positioning in math and science are influential in students’ post-secondary and career outcomes, with students who are positioned highly in either subject having greater post-secondary attendance, program length, higher representation in STEM college majors, and expectations for future jobs in STEM fields in comparison to students tracked lowly. Additionally, education aspirations and expectations mediated the relations between math academic track positioning and each of the outcomes, although the effects were small in size. Educators should consider exploring avenues for improving education quality in low academic tracks.

The theoretical basis of the proposed study is drawn from an ecological-transactional (Lynch & Cicchetti, 1998) systems approach to development, which focuses on contexts, and correspondingly, overlays the gender affirmative model’s (GAM) transactional model of support (Keomeier & Ehrensaft, 2018) to reveal protection in the school ecology. Combining these two approaches provides unique insights into protective factors in the school ecology, distinct from developmental systems approaches driven by the minority stress model (Meyer, 2003), which are designed to highlight the multidimensional quality of risk (Eisenberg et al., 2019). The dissertation had two central aims: 1) to report on the development of the Gender Affirmative School Climate (GASC) scale, a self-report survey designed to capture high school climate specific to the domain of gender, and 2) to explore how gender affirmative school climate (GASC) relates to student self-esteem and school belongingness. Unique from risk factors approaches the central aims sought out to identify protective factors within a developmental system ecology of the high school context.In two pilot studies (N=12; N=758; trans = 413, non-trans = 344) and primary study (N=813; trans = 482, non-trans = 328) results for scale development provide evidence to validate assumptions that the proposed (GASC) construct captures what was intended, that is, school climate specific to the domain of gender. However, measurement invariance procedure showed that not all items operated equivalently across trans and non-trans groups, and confirmed that the proposed scale meets criteria for “weak measurement invariance”. High school students that reported more positive school climate reported lower self-esteem scores. Only one protective moderator was consistent with hypotheses: More feelings of similarity to peer group gender (boys) emerged as a protective factor for transgender identified high schoolers attenuating the negative relationship between perceptions of school climate and self-esteem. Latent measurement models for each gender group demonstrated that the school belongingness construct is highly related to the proposed (GASC) construct. This demonstrated domain overlap with “feelings of school belongingness” signals that the proposed scale showed good convergent validity. The results provide insight about ways high schools can be pro-active to promote a healthier school climate for transgender students.

Given the emergence of social media over the past decade and its popularity with adolescents, understanding its impact on this population is crucial to investigate. The purpose of this thesis was to identify potential links between social media use, identity formation, self-esteem, and social comparison motives. The first hypothesis proposed a positive association between passive social media use and identity moratorium, diffusion, and distress. The second hypothesis suggested self-esteem would mediate this relationship. The final hypothesis posited that the social comparison motives of self-destruction and self-evaluation would exacerbate negative influences of social media use on self-esteem and identity, while self-enhancement and self-improvement motives would buffer them. Two studies were conducted, one observational with 568 participants and one experimental with 15 participants. The first study found active social media use significantly predicted identity diffusion and distress, whereas the second study determined passive social media use led to identity distress. Self-esteem was not found to mediate either relationship. Finally, self-destruction, self-enhancement, self-evaluation, and self-improvement all had differing moderating effects on social media use and the distinct identity outcomes and self-esteem. These results introduce a new concern for late adolescents still developing their identities who utilize social media, as having an online presence can further impede commitment to an identity.

Prejudice and discrimination toward gender non-conforming individuals is prevalent and extreme in today’s society. This prejudice can manifest in social exclusion, bullying, and victimization, or physical and sexual assault, and can result in negative social, psychological, academic, and physical health outcomes (e.g., depression, anxiety, suicidality). Thus, it is important to understand the perpetrators of gender expression-based aggression and discrimination. In two studies, I addressed how and why people experience prejudice toward gender non-conforming individuals. Using an affordance management theoretical framework, Study 1 identified threats young adults perceived from gender non-conforming peers. There were differences in perceived threats to personal freedoms, social coordination, and values for gender conforming and non-conforming peers, and these perceptions differed by the political ideology of the perceiver. Study 2 explored children’s threat perceptions associated with gender non-conformity. Children perceived threats to social coordination from gender non-conforming peers but not threats to moral values. Results from both studies supported the use of this theoretical framework for studying prejudice toward gender non-conformity. Together, these studies provide unique information about adults’ and children’s reasons for prejudice toward gender non-conforming peers.

Prosocial behavior refers to voluntary acts done to benefit another. To date, there is little work examining children’s prosocial behavior toward outgroup members. Across several multi-method multi-informant data sets, I used various statistical methods (e.g., latent change score analysis, mediation and moderation analyses) to examine the predictors, correlates, and development of children’s prosocial behavior toward various outgroup members (e.g., gender, race). In Study 1, I examined the relation between preschoolers’ other-gender friendships and their prosocial behavior toward other-gender peers. Findings showed support for the hypothesis that cross-gender friendships are positively associated with children’s prosocial behavior toward other-gender peers over time. Further, children’s prosocial behavior toward other-gender peers positively predicted children’s later gender attitudes suggesting that fostering intergroup prosocial behavior could be a potentially effective solution to reduce intergroup prejudice. To capture the multifaceted nature of social identities, in Study 2, I examined children’s prosocial behavior toward various ingroup and outgroup members with the intention of exploring the degree of ingroup-ness and testing the transfer effect of intergroup contact. Findings showed that cross-gender friendships were positively predictive of school-age children’s prosocial behavior toward diverse others. Further, cross-race friendships are related to children’s diverse prosocial behavior indirectly through children’s race-based sympathy. Study 3 extended the previous two studies by testing both Intergroup Contact Theory and Social Identity Theory and taking into consideration the social identity of oneself (versus the targets of prosocial behavior). Specifically, I examined the central component of gender identity: children’s perceived same-gender similarity and other-gender similarity, as well as children’s same- and other-gender friendships. Results showed that only intergroup friendships, but not children’s gender identity, were related to children’s prosocial behavior toward same- and other-gender peers. In sum, this basic research has potential to shed light on ways to promote equity and inclusion across various social groups early in development.

Dynamic Bayesian networks (DBNs; Reye, 2004) are a promising tool for modeling student proficiency under rich measurement scenarios (Reichenberg, in press). These scenarios often present assessment conditions far more complex than what is seen with more traditional assessments and require assessment arguments and psychometric models capable of integrating those complexities. Unfortunately, DBNs remain understudied and their psychometric properties relatively unknown. If the apparent strengths of DBNs are to be leveraged, then the body of literature surrounding their properties and use needs to be expanded upon. To this end, the current work aimed at exploring the properties of DBNs under a variety of realistic psychometric conditions. A two-phase Monte Carlo simulation study was conducted in order to evaluate parameter recovery for DBNs using maximum likelihood estimation with the Netica software package. Phase 1 included a limited number of conditions and was exploratory in nature while Phase 2 included a larger and more targeted complement of conditions. Manipulated factors included sample size, measurement quality, test length, the number of measurement occasions. Results suggested that measurement quality has the most prominent impact on estimation quality with more distinct performance categories yielding better estimation. While increasing sample size tended to improve estimation, there were a limited number of conditions under which greater samples size led to more estimation bias. An exploration of this phenomenon is included. From a practical perspective, parameter recovery appeared to be sufficient with samples as low as N = 400 as long as measurement quality was not poor and at least three items were present at each measurement occasion. Tests consisting of only a single item required exceptional measurement quality in order to adequately recover model parameters. The study was somewhat limited due to potentially software-specific issues as well as a non-comprehensive collection of experimental conditions. Further research should replicate and, potentially expand the current work using other software packages including exploring alternate estimation methods (e.g., Markov chain Monte Carlo).

The overall goal of this dissertation was to examine teacher characteristics, teachers’ beliefs, and contextual factors that may motivate teachers’ decisions to engage in high quality teacher-child interactions. I use two complementary studies to meet this goal. These two studies provide insight into several aspects of early childhood teachers’ and children’s interactions including the complexity of the conversations and teachers’ supportive practices. Findings from both studies reveal that teachers are selective in how they distribute their time and attention across various types of high-quality interactions with children. Study 1suggests that teachers’ perception of how often children interact with one another motivates their decisions to engage in high quality teacher-child interactions (i.e., facilitate children’s peer interactions). Study 2 suggests that teacher well-being, specifically teacher depression, limits the extent to which teachers engage in high quality interactions (i.e., complex conversations with children). Importantly, this dissertation also showed that teachers’ motivation for engaging in teacher-child interactions does not stem from their own characteristics or perceptions alone. In addition to these factors, contextual aspects of teacher-child interactions also appear to influence teachers’ motivation to engage in high-quality teacher child interactions. Study 1 revealed that the gender composition of the children involved in each teacher-child interaction was associated with the extent to which teachers use facilitative practices, as well as with the direction and magnitude of both quality and frequency effects on teachers’ facilitation. Moreover, Study 2 revealed that the relation between teacher depression and complex conversations is changed when teachers and children are engaged in academic activities (e.g., math, books, language) relative to play or routine activities. In both Study 1 and 2, I used a teacher-focused observational coding system. Use of this observational coding system contributes novel, objective information about teacher-child interactions, as prior work on teacher-child interactions has most often relied on teachers’ self-reports of how often they interact with students. Findings from this dissertation will contribute new knowledge about teacher and contextual classroom characteristics and teacher-child interactions that will inform efforts to promote positive teacher child interactions and, in turn, student and teacher well-being.

Segregation into own-gender peer groups, a common developmental pattern, has many potentially negative short- and long-term consequences. Understanding the social cognitive processes underlying intergroup processes may lead to a better understanding of, and a chance to improve, intergroup relations between boys and girls; however, until recently gender-typed cognitions have not received a lot of attention. Therefore, in two complementary studies, this dissertation examines developmental patterns and predictors of a particular type of social cognition, gender-based relationship efficacy (GBRE). The first study examines mean-level and interindividual stability patterns of GBRE longitudinally in two developmental periods: childhood and pre-adolescence. Specifically, the first study examined children’s and pre-adolescents’ GBRE toward own- (GBRE-Own) and other-gender (GBRE-Other) peers over a one-year period. Using a four factor repeated measures analysis of variance, the results indicated that GBRE-Own is significantly higher than GBRE-Other across both cohorts. GBRE-Other, however, increased from childhood to pre-adolescence. Stability and cross-lag effects were examined using a multi-group panel analysis and revealed that GBRE-Own and GBRE-Other were stable. Additionally, high levels of GBRE-Own led to lower levels of GBRE-Other one year later, but high levels of GBRE-Other led to higher levels of GBRE-Own. Implications for understanding segregation processes and suggestions for future research are discussed.

The second study examined potential affective/cognitive, behavioral, and contextual predictors of GBRE-Other in pre-adolescence. Several hypotheses were tested using panel models and regression analyses, but there was limited support. Results indicated that GBRE-Other predicted more positive attitudes toward other-gender peers and higher preferences for other-gender peer interaction and that, for boys, anxious attitudes toward other-gender peers negatively predicted GBRE-Other and, for girls, parental attitudes toward their children’s other-gender friendships negatively predicted GBRE-Other. The lack of significant findings in the second study should be interpreted cautiously. In general, GBRE is an important construct and more research is needed to fully understand the developmental progression and implications.

Aggression is inherently social. Evolutionary theories, for instance, suggest that the peer group within which an aggressor is embedded is of central importance to the use of aggression. However, there is disagreement in the field with regard to understanding precisely how aggression and peer relationships should relate. As such, in a series of three empirical studies, my dissertation takes a relational approach and addresses some of the inconsistencies present in the extant literature. In Study 1, I examined how qualities of youth's close friendships contributed to the use of aggression, both concurrently and over time. I found that youth with large friendship networks were more aggressive, whereas those with highly interconnected friendship network decreased in aggression over time. Using a dyadic mediation model, the second study considered the precursors to aggressors' friendships with peers. Specifically, I explored aggressive youth's interactions with unfamiliar peers and assessed how the interactions that unfold affected the quality of the relationship. I found that dyads who were highly discrepant in their tendencies toward aggression failed to collaborate well with one another, and this led to less positive perceptions of one another. Whereas the first two studies concerned aggressors' relationships with their friends (Study 1) and acquaintances (Study 2), Study 3 focused on a different type of relationship – the relationship between an aggressor and his or her victim(s). In the third study, I explored how power dynamics operate within an aggressor-victim dyad and assessed whether differences in the balance of power between the aggressor and victim affected the strength of their relationship. I found that more aggressor-victim dyads were characterized by a relative balance than imbalance in power, and that power balanced dyads had stronger and more sustained aggressor-victim relationships. By taking a relational approach to the study of aggression, this dissertation has advanced extant work in the field. That is, these findings move away from the simplification and aggregation of relational constructs (e.g., relationships, friendships), and instead consider the nuances of specific types of relationships or interactions with specific peers, allowing for a better understanding of the relational nature of aggression.