This study explored the effects of a middle school physical activity intervention for adolescent girls on the executive functioning involved in science learning. The girls, ages 11 to 14, were at risk for low self-esteem, sedentary lifestyle, and poor health outcomes. Executive function stems from interdependent cognitive control processes that…

Using data from the Early Childhood Longitudinal Study--Kindergarten cohort (ECLS-K), this study aimed to identify body mass index (BMI) trajectories from kindergarten to eighth grade using group-based trajectory modeling (GBTM), examine the relationships between BMI trajectories and adolescents' school achievement (reading and math), determine…

Although research has shown that peer victimization is related to negative school outcomes, whether ethnic ingroup size alters victimization-adjustment links is unclear. This study examines whether smaller ethnic ingroup representation amplifies the negative associations between peer victimization and school adjustment. We also examine whether…

Sexualized gender stereotypes (SGS) are commonly endorsed by adolescent girls. These stereotypes include the notion that girls can enhance their social status by prioritizing their sexualized attractiveness, which necessitates downplaying other traits such as intelligence. According to the stereotype emulation hypothesis, a girl will be more…

Social media use among adolescents continues to increase each year. This cross-sectional study explored how the amount of time spent using social media and the frequency of specific behaviors on social media, namely, behaviors that involve self-objectification, were related to body surveillance and body shame among a sample of early adolescents (N…

This study compared bullying experiences between ethnic minority youth and Korean majority youth in South Korea, and examined whether the student-teacher relationship is associated with their bullying experiences. Participants comprised 148 ethnic minority students and 165 Korean majority students in Grades 4 to 11 in South Korea. Bivariate…

This study examined the mediating effect of friends' characteristics (problem behavior and academic achievement) in the association between students' background (family and individual factors) and later academic adjustment, as operationalized by problem behavior and academic achievement. We recruited 998 participants in three public middle schools…

This study investigated early adolescents' psychophysiological response to a school-related stressor (SRS) as indexed by heart rate variability and examined the unique and interactive effects of heart rate variability and temperament on academic achievement. A total of 91 seventh graders watched an SRS video-clip while their heart rate variability…

This study investigated the structure and concurrent validity of the Beliefs About Fighting Scale (BAFS). Participants were 2,118 students from three urban middle schools who completed measures of their beliefs, frequency of physical aggression, victimization, and nonviolent intentions. Ratings of students' frequency of physical aggression,…

The purpose of this study was to determine whether bullying perpetration in early adolescence is capable of predicting delinquency 1 year later. Nine control variables were included in a regression analysis of the bullying-delinquency relationship in 1,001 schoolchildren (X-bar age = 12.97 years). The nine control variables (age, sex, race, social…

This two-wave study examined the cross-lagged relations between teacher-student relatedness (student-teacher communication, teacher trust, and teacher alienation) and reading achievement of academically at-risk secondary students (N = 787) in Singapore. Compared with the cohort, these students had lower aggregate scores in a national examination…

To date, little has been known about teachers' success in bullying interventions. Thus, the present study analyzes how successfully teachers intervene in real bullying situations, based on an analysis of 1,996 reports by German students aged between 12 and 15 (49.2% female) from 24 schools. Predictors of success included intervention strategy…

This study examined group differences by grade (fifth graders in elementary school and sixth graders in middle school) and gender in academic (behavioral and emotional engagement, academic self-concept, and worry) and socio-emotional adjustment (self-esteem, social satisfaction, social self-concept, and worry). Self-report data were collected from…

The Bystander Intervention Model proposed by social psychologists Latané and Darley has been used to examine the actions of peer bystanders in bullying. The five-stage model consists of notice the event, interpret event as an emergency, accept responsibility for intervening, know how to intervene, and implement intervention decisions. The current…

The experience of childhood family adversity may affect adolescent sexual behavior, yet the variation in the types of adversities is unknown. We analyzed data from the Taiwan Education Panel Survey. In 2007, 18,995 students aged 18 years retrospectively reported the age of first sexual activity and the experiences of childhood adversities.…