Peers increase adolescent risk taking by enhancing activity in the brain's reward circuitry

The presence of peers increases risk taking among adolescents but not adults. We posited that the presence of peers may promote adolescent risk taking by sensitizing brain regions associated with the anticipation of potential rewards. Using fMRI, we measured brain activity in adolescents, young adults, and adults as they made decisions in a simulated driving task. Participants completed one task block while alone, and one block while their performance was observed by peers in an adjacent room. During peer observation blocks, adolescents selectively demonstrated greater activation in reward-related brain regions, including the ventral striatum and orbitofrontal cortex, and activity in these regions predicted subsequent risk taking. Brain areas associated with cognitive control were less strongly recruited by adolescents than adults, but activity in the cognitive control system did not vary with social context. Results suggest that the presence of peers increases adolescent risk taking by heightening sensitivity to the potential reward value of risky decisions.     

For better or for worse: Social influences on risk-taking

This study investigated changes in risk-taking propensity on a behavioral decision-making task as a function of varying social conditions with peers. In contrast to the effects of direct peer influence (pro-risk and anti-risk messages by peers), we included a socially ambiguous context (neutral messages by peers) and a no-peer control (participants alone) as comparison conditions. Using a counterbalanced mixed factorial design, college students (N = 187) completed the Balloon Analogue Risk Task-Youth (BART-Y) twice during two consecutive sessions, including once alone and once with a confederate; the control group completed two sessions of the task alone. The findings showed that, in general, direct pro-risk messages led to the most robust and consistent changes in risk-taking. The findings are discussed in terms of the multidimensional and multidirectional nature of peer influence during the college years.     

同伴对青少年冒险行为的影响及其作用机制

青少年更倾向于从事冒险或鲁莽行为, 并且更容易受到同伴影响。从个人特质和社交互动等多个角度探讨的研究结果表明, 同伴对青少年冒险行为存在助长作用, 即当同伴在场时, 青少年的行为会更加冒险。同伴对青少年冒险行为的作用机制可以从心理、神经、遗传、社会文化等多个层面进行解释：在心理层面, 这种影响源于青少年寻求同伴认可和归属感的需要, 以及社会学习的作用; 在神经机制层面, 源于认知控制网络和刺激处理系统的相互作用; 在遗传层面, 源于特定基因的易感性等; 在社会文化层面, 同伴影响会因文化差异而带来程度与表现上的差异。未来研究应从发展、文化心理、构建复杂模型网络等视角深入探究同伴对青少年冒险行为的影响。     

Effects of anonymous peer observation on adolescents' preference for immediate rewards

Research suggests that the presence of peers influences adolescent risk‐taking by increasing the perceived reward value of risky decisions. While prior work has involved observation of participants by their friends, the current study examined whether observation by an anonymous peer could elicit similarly increased reward sensitivity. Late adolescent participants completed a delay discounting task either alone or under the belief that performance was being observed from a neighboring room by an unknown viewer of the same gender and age. Even in this limited social context, participants demonstrated a significantly increased preference for smaller, immediate rewards when they believed that they were being watched. This outcome challenges several intuitive accounts of the peer effect on adolescent risk‐taking, and indicates that the peer influence on reward sensitivity during late adolescence is not dependent on familiarity with the observer. The findings have both theoretical and practical implications for our understanding of social influences on adolescents' risky behavior.     

Antecedents of risk-taking behaviour among South African adolescents

This study aimed to investigate contextual predisposition to risk-taking behaviour among South African adolescents. Participants included 194 black adolescents from central South Africa (female = 50.5% between the ages of 16 and 19 years). The adolescents completed a youth risk behaviour survey as well as a questionnaire on their parental, peer, school, and community relationships. Data were analysed by means of multivariate analyses of variance and standard multiple regression analyses in order to predict risk-taking behaviour (violence, substance use, and risky sexual behaviour) from various relationship contexts (parents, peers, school, and community). Irrespective of relationship context, males portray a higher risk for all types of risky behaviour, and the more time adolescents spend with their peers, the higher their risk for engagement in risk-taking behaviour. Parental monitoring predicted a lower risk for portraying risky behaviour.     

Is it all in the reward? Peers influence risk‐taking behaviour in young adulthood

The presence of peers is suggested to increase risk‐taking behaviour by heightening response to reward. The current study investigated this using a computerized financial risk‐taking task which was performed twice by a group of young adults (n = 201, median age 19.8 years): once alone and once while in the presence of two peers. An overall increase in risk‐taking was observed when with peers compared to when alone (CHANGE). CHANGE was positively associated with self‐reported levels of reward responsiveness and fun seeking while older age and lack of perseverance were associated with reduced CHANGE. The association between risk‐taking when with peers and both resistance to the influence of peers and age was indirect through reward responsiveness. Reward responsiveness was positively associated with impulsiveness. Only in those who showed a peer‐related decrease in risk‐taking (1/3 of participants), risk‐taking in the presence of peers was associated with increased impulsiveness. The current findings suggest an important role for reward responsiveness in risk‐taking behaviour and demonstrate the influence of peers. Increased understanding of these processes has direct implications for prevention and intervention efforts. Placing risk‐taking behaviour within varying (social) contexts with an eye for differences in personality, development, and emotions provides ample scope for future research.     

Adolescent mice,unlike adults,consume more alcohol in the presence of peers than alone

One hallmark of adolescent risk‐taking is that it typically occurs when adolescents are with peers. It has been hypothesized that the presence of peers primes a reward‐sensitive motivational state that overwhelms adolescents' immature capacity for inhibitory control. We examined this hypothesis using a rodent model. A sample of mice were raised in same‐sex triads and were tested for alcohol consumption either as juveniles or as adults, with half in each age group tested alone and half tested with their cagemates. The presence of ‘peers’ increased alcohol consumption among adolescent mice, but not adults. The peer effect on human adolescent reward‐seeking may reflect a hard‐wired, evolutionarily conserved process through which the presence of agemates increases individuals' sensitivity to potential rewards in their immediate environment.     

Adolescent risk-taking is predicted by individual differences in cognitive control over emotional,but not non-emotional,response conflict

While much research on adolescent risk behaviour has focused on the development of prefrontal self-regulatory mechanisms, prior studies have elicited mixed evidence of a relationship between individual differences in the capacity for self-regulation and individual differences in risk taking. To explain these inconsistent findings, it has been suggested that the capacity for self-regulation may be, for most adolescents, adequately mature to produce adaptive behaviour in non-affective, “cold” circumstances, but that adolescents have a more difficult time exerting control in affective, “hot” contexts. To further explore this claim, the present study examined individual differences in self-control in the face of affective and non-affective response conflict, and examined whether differences in the functioning of cognitive control processes under these different conditions was related to risk taking. Participants completed a cognitive Stroop task, an emotional Stroop task, and a risky driving task known as the Stoplight game. Regression analyses showed that performance on the emotional Stroop task predicted laboratory risk-taking in the driving task, whereas performance on the cognitive Stroop task did not exhibit the same trend. This pattern of results is consistent with theories of adolescent risk-taking that emphasise the impacts of affective contextual influences on the ability to enact effective cognitive control.     

Mother still knows best: Maternal influence uniquely modulates adolescent reward sensitivity during risk taking

Adolescent decision‐making is highly sensitive to input from the social environment. In particular, adult and maternal presence influence adolescents to make safer decisions when encountered with risky scenarios. However, it is currently unknown whether maternal presence confers a greater advantage than mere adult presence in buffering adolescent risk taking. In the current study, 23 adolescents completed a risk‐taking task during an fMRI scan in the presence of their mother and an unknown adult. Results reveal that maternal presence elicits greater activation in reward‐related neural circuits when making safe decisions but decreased activation following risky choices. Moreover, adolescents evidenced a more immature neural phenotype when making risky choices in the presence of an adult compared to mother, as evidenced by positive functional coupling between the ventral striatum and medial prefrontal cortex. Our results underscore the importance of maternal stimuli in bolstering adolescent decision‐making in risky scenarios.     

Effect of peer presence on adolescents' risk-taking is moderated by individual self-esteem: An experimental study

Prior research suggests that the presence of peers increases adolescents' risk-taking. However, it is not clear whether the effect of peer presence is moderated by individual characteristics such as self-esteem, since individuals with low self-esteem are more susceptible to peer influence theoretically. The present study examined this problem using an adapted Stoplight Game in an experiment. A final sample of 140 adolescent students aged 14–18 (M = 16.25 ± 0.73 years, 61 girls), divided into two groups—low self-esteem and high self-esteem, according to their self-esteem scores, completed a risk-taking task either alone or in the presence of a same-sex peer. The results indicated that peer presence increased adolescents' risk-taking, specifically for those with low self-esteem, while those with high self-esteem were not affected by peer presence. The findings are helpful for our understanding of peer influence on adolescent risk-taking and the moderating role of the self and have practical implications for preventing and intervening adolescents' risk-taking via increasing their self-esteem.     

Peer influence on risk taking, risk preference, and risky decision making in adolescence and adulthood: an experimental study

In this study, 306 individuals in 3 age groups--adolescents (13-16), youths (18-22), and adults (24 and older)--completed 2 questionnaire measures assessing risk preference and risky decision making, and 1 behavioral task measuring risk taking. Participants in each age group were randomly assigned to complete the measures either alone or with 2 same-aged peers. Analyses indicated that (a) risk taking and risky decision making decreased with age; (b) participants took more risks, focused more on the benefits than the costs of risky behavior, and made riskier decisions when in peer groups than alone; and (c) peer effects on risk taking and risky decision making were stronger among adolescents and youths than adults. These findings support the idea that adolescents are more inclined toward risky behavior and risky decision making than are adults and that peer influence plays an important role in explaining risky behavior during adolescence.     

亲子关系与青少年冒险行为的关系:一个有调节的中介模型

该研究探讨了亲子关系与青少年冒险行为的关系,并提出一个有调节的中介模型,考察自控力的中介效应和不良同伴交往对该效应的调节效应。对1263名青少年采用问卷调查,研究工具包括关系网络问卷、中学生自我控制能力量表、同伴群体特征问卷、青少年冒险行为问卷。结果表明：（1）自控力在亲子关系与青少年冒险行为之间起中介作用,即亲子关系通过自控力间接影响青少年的冒险行为。（2）亲子关系通过自控力的间接效应受到不良同伴交往的调节,交往较多的不良同伴使低自控力青少年的冒险行为增多。因此,自控力在亲子关系与冒险行为之间存在中介效应,且该效应受到不良同伴交往的调节。     

亲子关系对青少年冒险行为的影响:有调节的中介模型

为探讨亲子关系对青少年冒险行为的影响机制,采用亲子关系问卷、同伴群体特征问卷及冒险行为问卷对山东省日照市三所普通中学的1275名初一到高三学生进行调查。结果发现：（1）父母支持与亲子冲突、不良同伴交往及冒险行为均呈负相关,亲子冲突与不良同伴交往、冒险行为均呈正相关,不良同伴交往与冒险行为呈正相关;（2）父母支持显著负向预测冒险行为,亲子冲突显著正向预测冒险行为,且两者的预测作用都可以通过不良同伴交往的中介作用实现;（3）在亲子冲突影响冒险行为这一模型中,不良同伴交往起中介作用,且中介的后半路径受性别调节,具体表现为：与女生相比,男生结交不良同伴会参与更多冒险行为。结果提示,不良亲子关系和不良同伴交往都是青少年冒险行为的重要预测因素,且不良亲子关系可以通过影响同伴交往影响青少年冒险行为。此外,在这一过程中,存在性别差异,当亲子冲突较多时,尤其应当关注男孩的同伴交往情况。     

When do peers influence adolescent males' risk taking? Examining decision making under conditions of risk and ambiguity

Risk taking is highly prevalent among adolescent males, and a range of studies have shown that decisions become riskier if a peer is present. However, previous studies have typically provided participants with explicit probabilities of risk in each situation. This does not accurately reflect adolescents' real‐world risk taking, where decisions are made in ambiguous situations alongside their peers. Aiming for a more ecologically valid design, the present experiment manipulated situational ambiguity and examined its interplay with group decision making and developmental factors. Adolescent males (N = 202) aged 12–15 completed a “Wheel of Fortune” task and then self‐reported their score, presenting an opportunity to cheat as a measure of antisocial risk taking. As predicted, adolescents were more likely to take risks when probabilities were ambiguous rather than explicit. Further, higher levels of gambling choices were made by groups in ambiguous, but not risk situations. Age significantly predicted gambling in ambiguous conditions, whereas developmental dispositions (risk perception, reward sensitivity, and inhibitory control) did not play a role. Findings provide an insight into the social and situational conditions under which adolescent males engage in reckless behavior.     

Mind the gap: bridging economic and naturalistic risk-taking with cognitive neuroscience

Economists define risk in terms of the variability of possible outcomes, whereas clinicians and laypeople generally view risk as exposure to possible loss or harm. Neuroeconomic studies using relatively simple behavioral tasks have identified a network of brain regions that respond to economic risk, but these studies have had limited success predicting naturalistic risk-taking. By contrast, more complex behavioral tasks developed by clinicians (e.g. Balloon Analogue Risk Task and Iowa Gambling Task) correlate with naturalistic risk-taking but resist decomposition into distinct cognitive constructs. We propose here that to bridge this gap and better understand neural substrates of naturalistic risk-taking, new tasks are needed that: are decomposable into basic cognitive and/or economic constructs; predict naturalistic risk-taking; and engender dynamic, affective engagement.     

Adolescent-specific patterns of behavior and neural activity during social reinforcement learning

Humans are sophisticated social beings. Social cues from others are exceptionally salient, particularly during adolescence. Understanding how adolescents interpret and learn from variable social signals can provide insight into the observed shift in social sensitivity during this period. The present study tested 120 participants between the ages of 8 and 25 years on a social reinforcement learning task where the probability of receiving positive social feedback was parametrically manipulated. Seventy-eight of these participants completed the task during fMRI scanning. Modeling trial-by-trial learning, children and adults showed higher positive learning rates than did adolescents, suggesting that adolescents demonstrated less differentiation in their reaction times for peers who provided more positive feedback. Forming expectations about receiving positive social reinforcement correlated with neural activity within the medial prefrontal cortex and ventral striatum across age. Adolescents, unlike children and adults, showed greater insular activity during positive prediction error learning and increased activity in the supplementary motor cortex and the putamen when receiving positive social feedback regardless of the expected outcome, suggesting that peer approval may motivate adolescents toward action. While different amounts of positive social reinforcement enhanced learning in children and adults, all positive social reinforcement equally motivated adolescents. Together, these findings indicate that sensitivity to peer approval during adolescence goes beyond simple reinforcement theory accounts and suggest possible explanations for how peers may motivate adolescent behavior.     

家庭功能与青少年消极冒险行为的关系:一个有调节的中介模型

为探讨家庭功能影响青少年消极冒险行为的作用机制及条件,采用青少年冒险行为问卷、家庭功能问卷、自尊问卷、同伴群体特征问卷对山东省日照市940名初高中学生进行调查。结果发现:(1)家庭功能不良不仅可直接预测青少年更多的消极冒险行为,而且也可通过使青少年交往更多不良同伴进而使其冒险行为进一步增多;(2)不良同伴交往对青少年消极冒险行为的预测受到个体自尊的调节。低自尊个体更容易受到不良同伴交往的影响而发生更多的消极冒险行为,表现出两风险因素的叠加效应。研究结果提示,家庭是青少年健康成长的基础,家庭功能不良可使青少年适应不良,塑造良好的同伴环境、培养良好的自我素质或可降低这一风险。     

Family conflict is associated with longitudinal changes in insular‐striatal functional connectivity during adolescent risk taking under maternal influence

Maternal presence has marked effects on adolescent neurocognition during risk taking, influencing teenagers to make safer decisions. However, it is currently unknown whether maternal buffering changes over the course of adolescence itself, and whether its effects are robust to individual differences in family relationship quality. In the current longitudinal study, 23 adolescents completed a risk‐taking task under maternal presence during an fMRI scan before and after the transition to high school. Behavioral results reveal that adolescent risk taking increased under maternal presence across a one‐year period. At the neural level, we found that adolescents reporting higher family conflict showed longitudinal increases in functional coupling between the anterior insula (AI) and ventral striatum (VS) when making safe decisions in the presence of their mother, which was associated with increased real‐world risk taking. These findings show that individual differences in family relationship quality undermine effective development of AI‐VS connectivity resulting in increased risk taking.     

Cognitive control deployment is flexibly modulated by social value in early adolescence

Recent mechanistic models of cognitive control define the normative level of control deployment as a function of the effort cost of exerting control balanced against the reward that can be attained by exerting control. Despite these models explaining empirical findings in adults, prior literature has suggested that adolescents may not adaptively integrate value into estimates of how much cognitive control they should deploy. Moreover, much work in adolescent neurodevelopment casts social valuation processes as competing with, and in many cases overwhelming, cognitive control in adolescence. Here, we test whether social incentives can adaptively increase cognitive control. Adolescents (M_age = 14.64, 44 male, N = 87) completed an incentivized cognitive control task in which they could exert cognitive control to receive rewards on behalf of real peers who were rated by all peers in their school grade as being of either high- or low-status. Using Bayesian modeling, we find robust evidence that adolescents exert more cognitive control for high- relative to low-status peers. Moreover, we demonstrate that social incentives, irrespective of their high- or low-status, boost adolescent cognitive control above baseline control where no incentives are offered. Findings support the hypothesis that the cognitive control system in early adolescence is flexibly modulated by social value.     

Let's chat: developmental neural bases of social motivation during real‐time peer interaction

Humans are motivated to interact with each other, but the neural bases of social motivation have been predominantly examined in non‐interactive contexts. Understanding real‐world social motivation is of special importance during middle childhood (ages 8–12), a period when social skills improve, social networks grow, and social brain networks specialize. To assess interactive social motivation, the current study used a novel fMRI paradigm in which children believed they were chatting with a peer. The design targeted two phases of interaction: (1) Initiation, in which children engaged in a social bid via sharing a like or hobby, and (2) Reply, in which children received either an engaged (“Me too”) or non‐engaged (“I'm away”) reply from the peer. On control trials, children were told that their answers were not shared and that they would receive either engaged (“Matched”) or non‐engaged (“Disconnected”) replies from the computer. Results indicated that during Initiation and Reply, key components of reward circuitry (e.g., ventral striatum) were more active for the peer than the computer trials. In addition, during Reply, social cognitive regions were more activated by the peer, and this social cognitive specialization increased with age. Finally, the effect of engagement type on reward circuitry activation was larger for social than non‐social trials, indicating developmental sensitivity to social contingency. These findings demonstrate that both reward and social cognitive brain systems support real‐time social interaction in middle childhood. An interactive approach to understanding social reward has implications for clinical disorders, where social motivation is more affected in real‐world contexts.