<div> <div> <div> <p>Recent studies using data from the National Health and Nutrition Examination Survey (NHANES) have used inconsistent approaches to identify and categorize beverages, especially those containing low-calorie sweeteners (LCS), also referred to as low-calorie sweetened beverages (LCSB). Herein, we investigate the approaches used to identify and categorize LCSB in recent analyses of NHANES data. We reviewed published studies examining LCS consumption in relation to dietary and health outcomes and extracted the methods used to categorize LCS as reported by the authors of each study. We then examined the extent to which these approaches reliability identified LCSBs using the Internet Archive Wayback Machine to examine beverage ingredients lists across 3 NHANES cycles (2011-2016). None of the four general strategies appeared to include all LCSB while also excluding all beverages that did not contain LCS. In some cases, the type of sweetener in the beverage consumed could not be clearly determined; we found 9, 16, and 18 of such “mixed” beverage identifiers in 2011-12, 2013-14, and 2015-15, respectively. Then, to illustrate how heterogeneity in beverage categorization may impact the outcomes of published analyses, we compared results of a previously published analysis with outcomes when “mixed” beverages were grouped either all as LCSB or all as sugary beverages. Our results suggest that caution is warranted in design and interpretation of studies using NHANES data to examine dietary and health correlates of sweetened beverage intake. </p> </div> </div> </div>

Background. Despite on-going efforts to reduce bullying among adolescents, this phenomena remains a persistent public health problem (Espelage & Colbert, 2015). Positive youth development (PYD)-physical activity based programs have the potential to target health risk behaviors by focusing on positive psychological assets and promoting personal growth (Fraser-Thomas, Côté, & Deakin, 2005). Similarly, physical activity has been associated with physical and psychosocial benefits as it enhances the process of development, promote life skills, and foster personal and interpersonal skills through peers and non-parental adult interactions (Fraser-Thomas et al., 2005; Weiss, Smith, & Stuntz, 2008). While we know quite a bit about PYD programs and understand the importance of physical activity related to its influence on bullying behaviors, we know far less about the effectiveness of anti-bullying programs that combine both PYD with physical activity components. However, addressing this gap in the literature could inform prevention science research efforts as it would enhance understanding on how such interventions might decrease bullying in youth. This study aimed to evaluate the effectiveness of positive youth development (PYD) physical activity based interventions on bullying behaviors among pre- and young adolescents (8 - 14 years old). Methods. A systematic review was conducted and included a search of five databases (PsycINFO, PubMed, Cochrane Library, ERIC and CINAHL), and reference lists of included studies and reviews from 2003 to 2017. Additional information was requested from study authors. The study inclusion criteria included interventions that used both PYD and physical activity components, recruited participants who ranged in age from 8 to 14, and that targeted bullying behaviors (bullying, victimization, and bystander). Two independent reviewers assessed studies, and extracted data, and one reviewer evaluated risk of bias using the Cochrane risk of bias tool (Higgins, Sterne, Savović, Page, & Hróbjartsson, 2016). Studies were placed into two groups based on type of study (quasi-experimental and experimental). To determine effect sizes for the quasi-experimental designs and experimental designs, Pearson’s correlation coefficient (r) and standardized mean differences (SMD) were used, respectively. Results. Seven studies met the inclusion criteria, of which three were quasi-experimental and four were experimental studies. For bullying outcome, the quasi-experimental studies were found to have a small effect size (r = -.24 to -.22) while experimental designs had small, medium, and large effect size (SMD = -.68 to -.27). For victimization, a medium effect size was found in one study (SMD = -.53), and for bystander involvement, a medium effect size was found for unadjusted model (r = .37), and a small/negligent effect size was found for the adjusted model (r = -.05). Reductions in bullying and victimization, and increase in prosocial bystander behavior were found across the physical activity-based, PYD interventions, which utilized a combined approach of PYD components (e.g., caring, empathy, respect), and physical activity context, as well as the use of an interactive and supportive approach to deliver the program’s PYD component between the participants and staff. Selection bias, lack of blinding bias, attrition to follow-up bias, and failure to control for confounding were found across the studies, with experimental study designs reporting generally better quality than quasi-experimental. Conclusion. PYD-based, anti-bullying interventions with a physical activity component are promising in reducing bullying among adolescents. Findings revealed that the further interventions should be structured into a physical activity-based PYD setting that foster youth’s psychosocial development and provide them with opportunities to develop these PYD components in a mastery-oriented climate, which in turn may reduce problem behaviors The small number of studies identified strongly suggests that there remains a critical need for PYD-physical activity based interventions that target bullying behaviors.

Genetic and home chaos influences in early childhood have been independently associated with externalizing problems, characterized by inattentive, hyperactive, and aggressive behaviors. However, the Behavioral Genetics approach indicates that genetic and environmental influences, although independently effective, interact to produce behavior throughout development. Thus, this thesis uses two samples, the Early Growth and Development study (EGDS), n= 564, and the Avon Longitudinal Study of Parents and Children (ALSPAC), n= 8,952, and two genetically-sensitive approaches, a parent-child adoption approach and a polygenic scoring approach, to examine how genetic influences and home chaos interact in early childhood (age 3-4) to predict externalizing problems later in childhood (age 7). Results indicate that, although home chaos is correlated with later externalizing problems, the effect is reduced in the context of earlier externalizing, possibly suggesting that home chaos is most salient for concurrent, not later, externalizing problems. In addition, genetic influences were not predictive of externalizing problems in either study, nor was the interaction of home chaos and genetic influences. This pattern of results suggests that, although home chaos may be an important factor for concurrent externalizing problems, other factors, e.g., parenting style and prenatal risk, may be more salient than home chaos, especially in interaction with genetic effects. Further, failure to find genetic influence in this thesis suggest that accounting for the broad scope of genetic influences on complex traits like externalizing and the specific genetic risk for individual externalizing phenotypes is important in attempts to find genetic influence and interaction.

<div>Scholars in the field of gifted education have identified that summer enrichment programs can have academic and socioemotional benefits for adolescents with gifts and talents. Although some studies have pointed to the intercultural benefits of such programs, few have focused directly on the intercultural benefits multicultural enrichment programs can provide.</div><div>This mixed-methods study had three purposes: (1) to identify and adapt an instrument capable of measuring cultural responsiveness in adolescents with gifts and talents, (2) to examine if adolescents with gifts and talents change in cultural responsiveness over the course of a multicultural, residential summer enrichment program, and (3) to explore effective pedagogical strategies for teaching multicultural groups of adolescents with gifts and talents.</div><div>The Miville-Guzman Universality Scale-Short (Fuertes et al., 2000) was selected as the instrument of focus. The instrument was piloted, and the data analyzed using confirmatory factor analysis and reliability analysis. Cognitive interviews with participants were also used to revise the items. A combination of canonical function analysis and qualitative responses were used to analyze participants’ (n=308) growth in cultural responsiveness over the course of the summer enrichment program. Finally, interviews with teachers and open-response answers from students were used to find the most effective pedagogical strategies for educating multicultural students.</div><div>Findings include a revised M-GUDS-S instrument for adolescents with gifts and talents (AM-GUDS-S), evidence that multicultural enrichment programs can have a positive effect on student intercultural relations with profiles for how those relations develop over a two-week period, and a series of pedagogical strategies that can be used by educators to facilitate learning for groups of domestically, internationally, and linguistically diverse students.</div>

Recent modeling work shows that patterns of shared perceptual features relate to the group-level order of acquisition of early-learned words (Peters & Borovsky, 2019). Here we present results for two eye-tracked word recognition studies showing patterns of shared perceptual features likewise influence processing of known and novel noun-concepts in individual 24- to 30-month-old toddlers. In the first study (Chapter 2, N=54), we explored the influence of perceptual connectivity on both initial attentional biases to known objects and subsequent label processing. In the second study (Chapter 3, N=49), we investigated whether perceptual connectivity influences patterns of attention during learning opportunities for novel object-features and object-labels, subsequent pre-labeling attentional biases, and object-label learning outcomes. Results across studies revealed four main findings. First, patterns of shared (visual-motion and visual-form and surface) perceptual features do relate to differences in early noun-concept processing at the individual level. Second, such influences are tentatively at play from the outset of novel noun-concept learning. Third, connectivity driven attentional biases to both recently learned and well-known objects follow a similar timecourse and show similar patterns of individual differences. Fourth, initial, pre-labeling attentional biases to objects relate to subsequent label processing, but do not linearly explain effects of connectivity. Finally, we consider whether these findings provide support for shared-feature-guided selective attention to object features as a mechanism underlying early lexico-semantic development.

<div>Adversity stemming from socioeconomic risks poses a considerable threat to the wellbeing of parents and youth. Research has shown that children’s exposure to cumulative(consisting of multiple co-occurring risks), chronic(experienced across more than one timepoint), and early(experienced during the birth-to-three-year period) socioeconomic adversity is particularly detrimental to their development. The first aim of this dissertation was therefore to create a measure of socioeconomic adversity that incorporates multiple risk indicators, and that could be used to tap into both the chronicity and timing of exposure. Using this measure, the problem that this dissertation aimed to address is the conflicting evidence that effective parenting is crucial in facilitating positive outcomes in at-risk youth, but that parenting itself is severely compromised in families experiencing socioeconomic adversity. Therefore, the overarching goal of this dissertation was to identify protective factors that can be leveraged to promote positive cascades for parents and youth in the context of socioeconomic adversity. Paper 1 analyzed whether social capital facilitates parental resilience, or the capacity of parents to deliver competent and high-quality parenting to children despite the presence of socioeconomic risks. Paper 2 assessed whether positive parenting in turn facilitates adolescent resilience and well being, or the reduction of maladaptive outcomes and presence of flourishing outcomes despite their exposure to this adversity. Given differences in the experiences of socioeconomic adversity as well as its effects on parents and youth across race-ethnicities, a major goal of this work was to test dissertation aims separately within Black, Hispanic, and White families. Overall, Paper 1 findings suggest that social participation and perceived neighborhood control may attenuate the effects of socioeconomic adversity on positive parenting for Black and White mothers respectively. For Hispanic mothers, social cohesion was found to be a promotive factor for positive parenting in the context of socioeconomic adversity. Paper 2 results indicate that socioeconomic adversity is indirectly associated with higher levels of adolescent substance use in Black youth, and lower levels of adolescent wellbeing in White youth, through lowered self-regulation in middle childhood. However, higher levels of positive parenting in early and middle childhood seemed to weaken these negative effects within non-Hispanic families. These results reinforce the need to enhance social and neighborhood capital for parents facing socioeconomic adversity, in order to facilitate positive parenting behaviors that may in turn protect youth from its negative effects.<br></div>

<p>This dissertation evaluated the complex inter-relatedness between co-occurring childhood maltreatment exposures, physical intimate partner violence (perpetration and victimization), substance use frequency, and molecular genetics for substance use, utilizing appropriate developmental models and theoretical approaches. Three studies were proposed within this dissertation. Data for the three studies come from a national longitudinal panel study: The National Longitudinal Study of Adolescent to Adult Health (Add Health; Harris, 2013). Across studies, latent profile analysis was used to evaluate co-occurring childhood maltreatment exposures based on type and severity of exposures, which resulted in three homogenous sub-groups. The first sub-group was composed of individuals that had high levels of physical abuse exposure and moderate levels of childhood neglect and emotional abuse exposures (high physical abuse sub-group). The second sub-group (high sexual abuse sub-group) included individuals with high severity of sexual abuse exposure and moderate severity of all other childhood maltreatment types (i.e., physical abuse, emotional abuse, and neglect). This second sub-group was, therefore, the most vulnerable in terms of their childhood maltreatment exposure. A final normative sub-group was also found that included a majority of individuals with low severity of childhood maltreatment exposure across types. Additionally, across all three studies, a probabilistic multifaceted genetic risk score (i.e., polygenic risk score) was created to evaluate substance use related genetic risk. The first study evaluated the role of co-occurring childhood maltreatment exposure on substance use development from adolescence to young adulthood while evaluating substance use related genetic moderation. Generalized estimating equations were used to test the proposed model in study 1. Findings suggest that the high physical abuse sub-group was more susceptible to genetic risk and had increases in substance use frequency only at high levels of genetic risk. In contrast, for the high sexual abuse sub-group, childhood maltreatment and environmental exposures were more ubiquitous for substance use development from adolescence to young adulthood. To elaborate, the high sexual abuse sub-group demonstrated increases in substance use from adolescence to young adulthood irrespective of genetic risk. In study 2, substance use frequency in young adulthood was tested as a mechanism between childhood maltreatment sub-groups and subsequent physical intimate partner violence perpetration in adulthood. Once again, genetic moderation for the direct association between childhood maltreatment sub-groups and substance use frequency in young adulthood was tested within the larger mediation model. In study 3, physical partner violence victimization in young adulthood was tested as a mediator of the association between childhood maltreatment sub-groups and substance use frequency in adulthood. In study 3, in addition to the above-mentioned genetic risk score, an additional substance use related dopamine polygenic risk score was also tested. Specifically, in study 3, genetic moderation by both genetic risk scores was tested on 1) the direct pathway from childhood maltreatment sub-groups to substance use frequency in adulthood, and 2) the direct pathway from physical intimate partner violence victimization in young adulthood to substance use frequency in adulthood. In both studies 2 and 3, product of co-efficient method was used to estimate mediation hypothesis, and moderated-mediation models were used to test for genetic moderation within the mediation model. Research aims for studies 2 and 3 were largely not supported. However, supplementary models indicate that substance use frequency may not be a causal mechanism but may be a contextual factor exacerbating the association between childhood maltreatment exposures and physical intimate partner violence perpetration. Implications for findings are discussed in detail. </p>

<p>Due to the great transitions and turmoil uniquely attributed to the period of adolescence, youth experience a greater risk for substance use and the multitude of concerns that coincide with the early onset of substance use. Many biological and environmental factors have been investigated as predictors of adolescent substance use. Executive function and disruptive behaviors are two important individual characteristics linked to adolescent substance use. Both smoking during pregnancy and sibling relationships are separate contexts that can mitigate or exacerbate the associations of executive function and adolescent substance use. The present study focuses on development of substance use through executive function deficits and disruptive behavior, while considering smoking during pregnancy and sibling relationships as unique moderators of these pathways. This work addresses a novel, interrelated set of questions with a series of three studies. The central hypothesis driving this program of research is that smoking during pregnancy and sibling relationships are under-studied contexts that can mitigate or exacerbate the associations of executive function, disruptive behavior, and adolescent substance use. This dissertation examines whether: (1) executive function mediates the smoking during pregnancy-disruptive behavior association and smoking during pregnancy exacerbates the executive function-disruptive behavior association, (2) smoking during pregnancy exacerbates the association between executive function and disruptive behavior during adolescence using a sibling comparison design, and (3) sibling relationship quality moderates developmental trajectories of executive function on the transition from disruptive problems to adolescent substance use using a high-risk, longitudinal sample. Findings challenge the link between exposure to smoking during pregnancy and both executive function and disruptive behavior. Further, these findings reinforce the need to utilize genetically-informed designs when examining potential effects of smoking during pregnancy. Additionally, this dissertation found support for the link between executive function and disruptive behavior, but not executive function and substance use. </p>

The goal of my dissertation is to take a step toward shifting the narrative in engineering from “surviving” to “thriving” so that more engineering students can reach their full potential in college and beyond. Many engineering students experience barriers such as the hardships of engineering culture, which are exacerbated for women and underrepresented racial/ethnic minorities(such as Black, Latinx, and Indigenous students). These barriers are well documented in research and well discussed in interventions to support engineering student success, under the assumption that helping students cope with these cultural and systemic barriers will, by itself, lead to their success. My research on engineering thriving challenges this assumption by asserting that the skills engineering students need to succeed academically, socially, and personally differ from the skills they need to “survive” cultural and systemic barriers.<br><div><br></div><div>This dissertation employs an exploratory multiphase research design, with three studies, to develop a model of thriving for undergraduate engineering students. The first study consists of a scoping literature review of 68 papers to define and characterize engineering thriving as the process in which engineering students develop and refine competencies that allow them to function optimally in engineering programs. From this definition, the second study employs a Delphi process with 47 experts to develop a model of engineering thriving that includes 1) internal thriving competencies; 2) external thriving outcomes; 3) engineering culture, systemic factors, resources, context and situation; and 4) how these three broader categories function together. The third study tests some of these relationships proposed in the model of engineering thriving using structural equation modeling(SEM) on a large dataset of responses by over 2,000 undergraduate U.S. engineering students to a survey that measured various constructs associated with thriving. Findings from the SEM analysis suggest that gratitude was one of the most important competencies for engineering student thriving, and that a holistic model approach accounted for 79% of the variance in engineering students’ belongingness and 25% of the variance in perceptions of faculty caring(two external thriving outcomes).<br></div><div><br></div><div>Understanding and supporting more engineering thriving has positive implications for students, recruitment and outreach, and engineering programs. Thriving is multidimensional and, thus, supporting engineering students to achieve traditional success metrics (such as academic performance and graduation) goes hand in hand with supporting their personal and social development and wellbeing. Recruitment and outreach of K-12 students can benefit from viewing engineering as an attractive and inspirational career, combating negative stereotypes that currently deter students from pursuing engineering. Engineering programs can benefit from developing a reputation and culture of thriving. However, cultural change requires the collective investment from all members of the engineering community.<br></div>

In this dissertation, I sought to understand foster parents’ perceptions of giftedness, how foster children’s strengths, gifts, and talents affect their experiences and those of their foster parents, and what resources and information foster parents have for supporting their foster children’s education and gifts. To understand these beliefs, I analyzed quantitative and qualitative survey data from 53 foster parents throughout the United States and analyzed interviews from 14 of those foster parents. Most foster parents surveyed perceived their foster children as a little or very different academically and in other ways than their peers not in foster care, and perceived they had different educational experiences than their peers, largely attributed to their lived experiences prior to entering and during foster care. Most participants felt their foster children’s abilities, strengths, and talents affected foster parents a little or very much. Interviewed and surveyed foster parents defined giftedness as including the following attributes: academic achievement, natural ability or innate talent, intelligence, domain-specific capabilities, performance or skills above average for their age or above their peers, unique approaches to learning, and motivation for learning. Interviewees also addressed non-academic forms of giftedness, socioemotional characteristics of children with gifts and talents, and noted that these students may have some difficulties in school. Foster parents explained the adaptations they have made to their parenting because of their foster children’s strengths, talents, and abilities, and highlighted the unique life experiences of foster children, which were not only hinderances but also could help them succeed academically and in life. Participants also expressed why they think foster children are not identified for gifted education programming. Foster parents had many needs related to their foster children’s education and strengths, talents, and abilities. They made recommendations to those who train new foster parents and provide ongoing training to current foster parents; to schools and teachers of foster children; and to new foster parents about how to best meet the needs of foster children and encourage their gifts and talents.