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This study investigated the peer group as a context for the socialization of young adolescents' motivation and achievement in school. Social network analysis was used to identify peer groups of adolescents in middle school whose members regularly interacted with each other (N = 331). Actual reports from these peer group members were used to assess peer group characteristics. Multilevel analyses indicated that peer groups did socialize some academic characteristics, controlling for selection factors. Students' peer group context in the fall predicted changes in their liking and enjoyment of school (intrinsic value) and their achievement over the school year. Students' peer group context was unrelated to changes in their beliefs about the importance of school (utility value) or expectancies for success over the school year.

The authors investigated how students' (N = 233) perceptions of the social environment of their eighth-grade classroom related to changes in motivation and engagement when they moved from seventh to eighth grade. In general, prior motivation and engagement were strong predictors of subsequent motivation and engagement, whereas gender, race, and prior achievement were not related to changes in motivation or engagement. A higher-order classroom social environment factor accounted for significant changes in all motivation and engagement outcomes. Four distinct dimensions of the social environment were differentially important in explaining changes in various indices of motivation and engagement. In general, however, students' perceptions of teacher support, and the teacher as promoting interaction and mutual respect were related to positive changes in their motivation and engagement. Students' perceptions of the teacher as promoting performance goals were related to negative changes in student motivation and engagement. Implications for recent educational reform initiatives were also discussed.

The goal of our article is to consider the intersection of the peer ecology and teacher practices for students’ academic motivation. We begin by reviewing two perspectives that explain why and how peers matter for students’ motivation. First, the quality of peer relationships and interactions provide affordances for social support. Second, peers are socializing agents, so the content of peer interactions matters for the development of students’ achievement beliefs, values, and goals. Within each of these theoretical frameworks, we discuss three kinds of peer relationships: friendship, social status, as well as the culture of support and norms that characterize the classroom peer group. Throughout, we consider classroom contextual factors that explain why peer relationships matter for students’ motivation and school adjustment. This sets the stage for the key goal of our article, which is to review evidence from the last ten years linking teacher practices to aspects of the classroom peer ecology that are important for students’ motivation in school. We conclude with a discussion of implications for educators and important directions for future research.

Recent research on intergroup contact theory has emphasized the potency of cross-group friendship for reducing prejudice. Evaluating this claim requires consideration of competing friend influence and selection processes. Few studies have jointly tested these mechanisms and often only in limited, majority/minority group contexts. In this study, the authors articulate several mechanisms linking friendships with intergroup attitudes and test them in a diverse U.S. context (two large high schools with significant representations of multiple ethnoracial groups). The analysis involves a longitudinal network model of friendship and attitude coevolution. The findings indicate that ingroup friends influenced intergroup contact attitudes (ICAs) over time, while more open ICAs promoted selection into cross-group friendship. By contrast, effects of cross-group friendships on ICAs were limited to White students with Black friends. These findings suggest that the effect of intergroup contact is overstated in the context of friendship and that more focus should be paid to understanding other friendship dynamics.

Popularity is highly desired among youth, often more so than academic achievement or friendship. Recent evidence suggests being known as “popular” among peers (perceived popularity) may be more detrimental during adolescence than being widely well-liked (sociometric popularity). Thus, this study sought to better understand how two dimensions of popularity (perceived and sociometric) may contribute to adolescents’ own perceptions of satisfaction and happiness regarding their social life at school, and hypothesized that “being popular” would have a more complex (and curvilinear) association with adolescents’ social contentment than previously considered by linear models. Adolescents’ peer popularity and self-perceived social contentment were examined as both linear and curvilinear associations along each status continuum in a series of hierarchical regressions. Participants were 767 7th-grade students from two middle schools in the Midwest (52% female, 46% White, 45% African American). Perceived and sociometric popularity were assessed via peer nominations (“most popular” and “liked the most”, respectively). Self-reported social satisfaction, best friendship quality, social self-concept, and school belonging were assessed as aspects of social contentment. The results indicated that both high and low levels of perceived popularity, as well as high and low levels of sociometric popularity, predicted lower perceptions of social satisfaction, poorer best friendship quality, and lower social self-concept than youth with moderate levels of either status. Implications to promote adolescents’ psychosocial well-being by targeting popularity’s disproportionate desirability among youth are discussed.

Interactions with friends are a salient part of students’ experience at school. Thus, friends are likely to be an important source of influence on achievement goals. This study investigated processes within early adolescent friendships (selection and influence) with regard to achievement goals (mastery, performance-approach, and performance-avoidance goals) among sixth graders (N = 587, 50 % girls at wave 1, N = 576, 52 % girls at wave 2) followed from fall to spring within one academic year. Students’ gender was examined as a moderator in these processes. Longitudinal social network analysis found that friends were similar to each other in mastery goals and that this similarity was due to both selection and influence effects. Influence but not selection effects were found for performance-approach goals. Influence effects for performance-approach goals were stronger for boys compared to girls in the classroom. Neither selection, nor influence, effects were found in relation to performance-avoidance goals. However, the higher a student was in performance-avoidance goals, the less likely they were to be named as a friend by classmates. Implications for early adolescents’ classroom adjustment are discussed.

School belonging is a key indicator of students’ academic well-being that is threatened by adults’ and peers’ transgressions of discrimination. Moreover, the hierarchical power structure at school enables adults and peers to enact ethnic-racial discrimination differently, which is also more or less salient among Black, Asian American, and Latinx youth. Therefore, this study aimed to disentangle the links between adult and peer-perpetrated racial discrimination at school, five distinct coping strategies, and school belonging across ethnic-racial groups. Participants were 1686 students in grades 9–12. These results indicated that adolescents who reported peer discrimination also reported greater proactive and aggressive coping. Black youth who reported more adult discrimination also reported more proactive coping, whereas Asian and Latinx youth who reported more peer discrimination reported more proactive coping. Peer discrimination was indirectly associated with greater school belonging via proactive coping, whereas adult discrimination was directly and negatively related to belonging. These findings suggest that adolescents may be selecting to proactively cope when faced with the discrimination source they most often navigate.

Alzheimer disease (AD) is characterized by deposition of amyloid-β, tau, and other specific proteins that accumulate in the brain in detergent-insoluble complexes. Alzheimer disease also involves glutamatergic neurotransmitter system disturbances. Excitatory amino acid transporter 2 (EAAT2) is the dominant glutamate transporter in cerebral cortex and hippocampus. We investigated whether accumulation of detergent-insoluble EAAT2 is related to cognitive impairment and neuropathologic changes in AD by quantifying detergent-insoluble EAAT2 levels in hippocampus and frontal cortex of cognitively normal patients, patients with clinical dementia rating of 0.5 (mildly impaired), and AD patients. Parkinson disease patients served as neurodegenerative disease controls. We found that Triton X-100-insoluble EAAT2 levels were significantly increased in patients withAD compared with controls, whereas Triton X-100-insoluble EAAT2 levels inpatients with clinical dementia rating of 0.5 were intermediately elevatedbetween control and AD subjects. Detergentinsolubility of presenilin-1, a structurally similar protein, did not differ among the groups, thus arguing that EAAT2 detergent insolubility was not causedby nonspecific cellular injury. These findings demonstrate that detergent-insoluble EAAT2 accumulation is a progressive biochemical lesion that correlates with cognitive impairment and neuropathologic changes in AD. These findings lend further support to the idea that dysregulationof the glutamatergic system may play a significant role in AD pathogenesis.

This study examined to what extent adolescents’ and their friends’ risk behaviors (i.e., delinquency and alcohol use) hinder or promote their academic achievement (grade point average [GPA]), and vice versa. Longitudinal data were used (N = 1,219 seventh‐ to ninth‐grade adolescents; Mage = 13.69). Results showed that risk behaviors negatively affected adolescents’ GPA, whereas GPA protected against engaging in risk behaviors. Moreover, adolescents tended to select friends who have similar behaviors and friends’ behaviors became more similar over time (same‐behavior selection and influence). Furthermore, although same‐behavior effects seemed to dominate, evidence was found for some cross‐behavior selection effects and a tendency in seventh grade for cross‐behavior influence effects. Concluding, it is important to investigate the interplay between different behaviors with longitudinal social network analysis.