Hanging Out With the Right Crowd: Peer Influence on Risk‐Taking Behavior in Adolescence

Peer influence plays a key role in the increase of risk‐taking behavior during adolescence. However, its underlying processes are not fully understood. This study examined the effects of social norms, conveyed through peer advice, on risk‐taking behavior in 15‐ to 17‐year‐old adolescents (N = 76). Participants played a card‐guessing task alone and with online peer advice. Results showed that risk‐taking increased in the presence of peers. The results further showed that adolescents took into account the uncertainty associated with gambles, as well as the social norms conveyed by peers. Our findings suggest that peers are most influential in uncertain situations and demonstrate the value of a social norms approach in examining the processes underlying peer effects.     

Variability and change in adolescents' prosocial behavior across multiple time scales

We examined variability and change in adolescents' prosocial behaviors directed to peers and friends across four time scales: two-years, one-year, two-monthly, and daily. Data from three longitudinal datasets with a total of 569 adolescents (55.7% girl, M_age = 15.23, SD = 3.90) were included. The overall time-related stability of prosocial behavior across time scales was moderate to excellent. Variability did not differ between early (age 10–15) and late (age 16–21) adolescence, but late adolescence was associated with higher mean levels of prosociality. Finally, results indicated that prosocial behaviors measured over longer periods (i.e., two-years and one-year) were positively associated with cognitive processes (perspective taking), whereas prosocial behaviors measured over shorter periods (i.e., two-monthly) were positively associated with affective processes (empathy).     

Harsh Parenting,Deviant Peers,Adolescent Risky Behavior: Understanding the Meditational Effect of Attitudes and Intentions

Although research supports the influence of parents and peers on adolescent risky behavior, less is known about mechanisms proposed to explain this relation. This study examined the influence of adolescent attitudes and intentions about such behaviors. Prospective, longitudinal data came from rural youth who participated throughout adolescence (n = 451). Observed harsh parenting and relationship with deviant peers was assessed in early adolescence, attitudes and intentions were measured during middle adolescence, and risky behavior was assessed in late adolescence. Results indicated that parenting and deviant peers was related to engagement in tobacco use, alcohol use, and risky sexual behaviors. Moreover, attitudes and intentions mediated this relationship even after parent use and adolescent early involvement in these behaviors were taken into account.     

Obesity-related behaviors in adolescent friendship networks

This study examines obesity-related behaviors within adolescent friendship networks, because adolescent peers have been identified as being important determinants of many health behaviors. We applied ERGM selection models for single network observations to determine if close adolescent friends engage in similar behaviors and to explore associations between behavior and popularity. Same-sex friends were found to be similar on measures of organized physical activity in two out of three school-based friendship networks. Female friends were found to engage in similar screen-based behaviors, and male friends tended to be similar in their consumption of high-calorie foods. Popularity (receiving ties) was also associated with some behaviors, although these effects were gender specific and differed across networks.     

Longitudinal Associations Between Adolescents' Bullying‐Related Indirect Defending,Outsider Behavior,and Peer‐Group Status

During adolescence, youth become more likely to avoid involvement in witnessed bullying and less likely to support victims. It is unknown whether—and how—these bystander behaviors (i.e., outsider behavior and indirect defending) are associated with adolescents' peer‐group status (i.e., popularity and social acceptance) over time. Cross‐lagged path modeling was used to examine these longitudinal associations in a sample of 313 Dutch adolescents (M_age‐T1 = 10.3 years). The results showed that status longitudinally predicted behavior, rather than that behavior predicted status. Specifically, unpopularity predicted outsider behavior and social acceptance predicted indirect defending. These findings suggest that a positive peer‐group status can trigger adolescents' provictim stance. However, adolescents may also strategically avoid involvement in witnessed bullying to keep a low social profile.     

Deflected Pathways: Becoming Aggressive,Socially Withdrawn,or Prosocial With Peers During the Transition to Adolescence

Although research has suggested strong continuity in children's adaptive or maladaptive behavior with peers across the transition to adolescence, less is known about deflected developmental pathways of peer social competence across this transition. This study investigates how mother–child and best friend relationship quality predict the deflection of youth from adaptive to maladaptive behavior with peers or the reverse. Using data from the NICHD Study of Early Child Care and Youth Development (N = 1,055), high‐quality friendships were associated with changes in peer social competence from 3rd to 6th grade. More positive and fewer negative interactions with a friend were linked with becoming more prosocial with peers, whereas less positive interactions with a friend were linked to becoming aggressive or withdrawn.     

Adolescent Personality as Risk and Resiliency in the Testosterone–Externalizing Association

Previous investigations of testosterone and externalizing behavior have provided mixed findings. We tested the hypothesis that self‐regulatory personality moderates the testosterone–externalizing behavior association in adolescence. Parents reported on their 13‐ to 18‐year‐old (N = 106, M_age = 16.01, SD = 1.29) children's personalities and psychopathology. Testosterone was measured via drool samples. As hypothesized, personality moderated the testosterone–externalizing behavior association. High testosterone predicted higher levels of externalizing behaviors, but only for adolescents low in Agreeableness and Conscientiousness. Also, personality acted as a resiliency factor: high levels of Conscientiousness, in the presence of high testosterone, predicted lower levels of rule breaking. Results highlight how endogenous factors, such as personality, may interact with testosterone, and emphasize the relevance of including personality moderators in future research.     

All My Friends Are Doing It: Potentially Offensive Sexual Behavior Perpetration Within Adolescent Social Networks

The current study used social network analysis to investigate peer network and individual predictors of potentially offensive sexual behaviors among high school students. Ninth‐grade students (n = 308; 158 girls) completed surveys assessing their perpetration of potentially offensive sexual behaviors against their peers, as well as measures of their sexualized gender stereotypes and propensity to self‐monitor. Participants selected up to eight of their closest friends from a roster. Results revealed homophily of potentially offensive sexual behaviors, such that adolescents perpetrated similar amounts of physical/verbal, electronic, and homophobic behaviors as their friends. Characteristics of the peer network (e.g., mean network perpetration, centrality of individual, and gender composition) and the individual adolescent (e.g., gender, sexualized gender stereotypes, self‐monitoring) predicted adolescents’ own behavior.     

Neural Correlates of Conflicting Social Influence on Adolescent Risk Taking

Adolescence is often characterized by heightened risk‐taking behaviors, which are shaped by social influence from parents and peers. However, little is understood about how adolescents make risky decisions under conflicting influence. The valuation system in the brain may elucidate how adolescents differentially integrate conflicting social information. Twenty‐eight adolescents (M_age = 12.7 years) completed a social influence task during a functional magnetic resonance imaging scan. Behaviorally, adolescents took more risks only when their parent endorsed risky decisions but not when their peers endorsed risky decisions. At the neural level, adolescents showed enhanced vmPFC–striatum functional connectivity when they made risky decisions that followed their parents’ risky decisions. Results suggest that parents’ decisions may guide youths’ risk‐taking behavior under conflicting influence.     

A Longitudinal Analysis of Cumulative Risks,Cumulative Promotive Factors,and Adolescent Violent Behavior

This study examined the effects of cumulative risk and promotive factors on violent behavior across the high school years of adolescence in a sample of predominately African American urban adolescents (N = 750). Cumulative risk and promotive factor indices represented individual characteristics, and peer, parental, and familial influences. Using growth curve modeling, we describe trajectories of cumulative risk and promotive factors and test the associations between the time‐varying cumulative risk and promotive factor indices and violent behavior. Higher risk was associated with higher levels of violent behavior. Higher levels of promotive factors were associated with less violent behavior and moderated the association between risk and violent behaviors. The results support the risk‐protective model of resiliency. Implications for prevention are discussed.     

Peers Increase Late Adolescents' Exploratory Behavior and Sensitivity to Positive and Negative Feedback

Adolescents take more risks with peers than when alone. It is not clear how peer presence affects adolescents' risky decision making, however. We used the Iowa Gambling Task (IGT)—a game used to assess decision making involving risk and reward—to examine how peers affect late adolescents' exploration of relevant environmental cues, ability to learn from the outcomes (positive and negative) of that exploration, and ability to integrate feedback to adjust behavior toward optimal long‐term outcomes. One hundred and one 18‐ to 22‐year old males (M = 19.8 years) were randomly assigned to play the IGT either alone or observed by peers. Late adolescents tested with observers engaged in more exploratory behavior, learned faster from both positive and negative outcomes, and evinced better task performance than those tested alone.     

Distinguishing Attachment and Affiliation in Early Adolescents’ Narrative Descriptions of Their Best Friendship

This study was designed to test for specificity in the relationship between individual friendship provisions and adjustment across early adolescence. Using a narrative procedure, attachment (i.e., accessing care) and affiliation (i.e., forming cooperative partnerships) were found to be distinct functional themes organizing 293 adolescents’ (M_age = 13) internal representations of their best friendship across three annual measurement occasions. Longitudinal, cross‐lag analyses revealed a unique transactional relationship between friendship affiliation and greater social competence over time, controlling for friendship stability, maternal relationship quality, socioeconomic status, and gender. By contrast, friendship attachment predicted fewer subsequent internalizing symptoms from ages 14 to 15. Together, findings point to the importance of understanding individual differences in the content of adolescents’ internal representations of friendship.     

Adolescent Pathways to Co‐Occurring Problem Behavior: The Effects of Peer Delinquency and Peer Substance Use

Delinquency and substance use are more likely to co‐occur in adolescence compared to earlier and later developmental periods. The present study examined developmental pathways to co‐occurring problem behavior from 6th to 10th grade (N = 2,002), testing how peer delinquency and substance use were linked to transitioning between abstaining, delinquency, substance use, and co‐occurring problem behavior. Developmentally, most youth transition from abstinence to delinquent behavior and then escalate to co‐occurring problem behavior. Once co‐occurring problem behavior onsets, remitting to single‐problem behavior or abstinence is unlikely. The impact of peers on problem behavior is domain‐specific when individuals transition from abstaining to a single‐problem behavior, but is more general with respect to escalation of and desistance from problem behavior.     

Peer Influence on Prosocial Behavior in Adolescence

Adolescence is a time of increased sensitivity to peer influence, which creates vulnerabilities but also opportunities. In this study, we examined the influence of peers on prosocial behavior in 12‐ to 16‐year‐old adolescents (N = 197). We utilized a public goods game in which participants made decisions about the allocation of coins between themselves and the group. Participants received manipulated peer feedback on a subset of decisions. Results indicate a significant interaction between feedback condition (prosocial, antisocial, or no feedback) and allocation choices: Prosocial behavior increased after prosocial feedback and decreased after antisocial feedback. These findings support the idea that peer influence creates not only vulnerabilities, but also opportunities for healthy prosocial development and social adjustment learning.     

Who Is Supporting Homeless Youth? Predictors of Support in Personal Networks

Homeless youth lack the traditional support networks of their housed peers, which increases their risk for poor health outcomes. Using a multilevel dyadic analytic approach, this study identified characteristics of social contacts, relationships, and social networks associated with the provision of tangible and emotional support to homeless youth (N = 419, M age = 20.09, SD = 2.80). Support providers were likely to be family members, sex partners, or non–street‐based contacts. The provision of support was also associated with contacts' employment and homelessness status, frequency of contact, shared risk behaviors, and the number of network members that were homeless and employed. The results provide insights into how homeless youth could be assisted to develop more supportive social networks.     

Multidimensional Profiles of Religiosity Among Adolescents: Associations With Sexual Behaviors and Romantic Relationships

Religiosity is associated with sexual behavior in adolescence; however, religiosity is a multidimensional construct, and it is not clear how different patterns of religiosity may differentially predict sexual behaviors and romantic relationships. We apply latent class analysis to nationally representative data from the National Longitudinal Study of Adolescent to Adult Health (Add Health; N = 10,149) to examine (1) what religiosity profiles exist among adolescents and (2) how they predict sexual behavior and romantic relationship status in adolescence and young adulthood. Religiosity in multiple domains was associated with lesser odds of sexual behavior compared to profiles marked by only affiliation, private, or public religiosity. Findings suggest that examining multiple facets of religiosity together is important for understanding how religiosity is associated with sexual behavior.     

Gender‐ and Age‐Related Differences in the Association Between Social Relationship Quality and Trait Levels of Salivary Cortisol

The majority of studies linking individual differences in the quality of social relationships and activity of the hypothalamic‐pituitary‐adrenal (HPA) axis have focused on the early development of attachment between infants and their caregivers. Later in development, during middle childhood and adolescence, the parallel HPA links to age‐appropriate social relationships with peers, parents, and siblings remain largely unspecified. This study addressed this knowledge gap. Early morning saliva samples were obtained from 367 children in middle childhood (ages 6–10) and 357 adolescents (M age=11–16 years) on two successive days 1 year apart and assayed for cortisol. Latent state–trait modeling was employed to separate variance in cortisol levels attributable to “stable trait‐like” versus “state or situational specific” sources to minimize the high moment‐to‐moment variation in basal adrenocortical activity. During adolescence but not middle childhood, and for girls but not boys, lower levels of “trait cortisol” were associated with poor quality social relationships. The pattern was robust, extending to the quality of relationships with parents, siblings, and peers. Importantly, the relationship was independent of the rates of internalizing or externalizing problem behavior. We found that isolating the variance in cortisol levels attributable to stable intrinsic sources revealed an interpretable pattern that linked individual differences in basal HPA activity to social relationships during adolescence. Studies are needed to reveal the biosocial mechanisms involved in the establishment of this gender‐ and age‐specific phenomenon and to decipher whether or not individual differences in this hormone‐behavior link are adaptive.     

Predictions From Early Adolescent Emotional Repair Abilities to Functioning in Future Relationships

This study examined adolescents' ability to utilize emotional repair—to actively change negative moods to more positive moods—as a predictor of the quality of their developing peer and romantic relationships over time. Utilizing observational data and partners' reports, adolescents (N = 184), their close peers, and their romantic partners were followed from ages 15–19. Adolescents with initially stronger emotional repair abilities were rated as increasingly socially competent over time, and both displayed and experienced increasingly positive interactive behaviors with close peers over time. These adolescents' romantic partners also reported more positive relationships, with enhanced communication, and fewer critical, blaming, or hostile interactions. Implications for the role of emotional repair abilities in the development of successful relationships during adolescence are discussed.     

Turning a Blind Eye? Punishment of Friends and Unfamiliar Peers After Observed Exclusion in Adolescence

In order to decrease the occurrence of social exclusion in adolescence, we need to better understand how adolescents perceive and behave toward peers involved in exclusion. We examined the role of friendships in treatment of perpetrators and victims of social exclusion. Eighty‐nine participants (aged 9–16) observed exclusion of an unfamiliar peer (victim) by their best friend and another unfamiliar peer. Subsequently, participants could give up valuable coins to altruistically punish or help peers. Results showed that participants altruistically compensated victims and punished unfamiliar excluders, but refrained from punishing their friends. Our findings show that friendship with excluders modulates altruistic punishment of peers and provide mechanistic insight into how friendships may influence treatment of peers involved in social exclusion during adolescence.     

Risk Factors Associated With Overweight and Obesity in College Students

College obesity is increasing, but to the authors' knowledge, no researchers to date have evaluated risk factors in this population. Objective: The authors assessed whether abnormal eating perceptions and behaviors were associated with overweight in college students. Participants and Methods: A sample of undergraduates (N = 4,201) completed an online survey containing demographic questions and the Eating Attitudes Test-26 (EAT-26) questionnaire. The authors stratified participants into normal-weight and overweight/obese groups and evaluated physical activity, EAT-26 score, purging behaviors, and answers to selected overweight screening questions on the basis of body mass index. A modified EAT-26 score of ≥ 11 was associated with overweight (p = .016). Results: Compared with normal-weight peers, overweight participants displayed an increased fear of bingeing, preoccupation with food, desire to be thinner, and engagement in dieting behavior. Mean body mass index also increased with age and physical inactivity (p < .001). Conclusions: Because physical inactivity, disordered eating perceptions, and disordered behaviors are associated with increased rates of overweight and obesity, identification of these risk factors in obese youths may increase understanding of weight loss barriers and facilitate the treatment of adolescent obesity.