Why adolescents conform to high-status peers: Associations among conformity, identity alignment, and self-esteem.

This study examined whether conformity to high- but not low-status e-confederates was associated with increases in identification with popular peers and subsequent increases in self-esteem. A sample of 250 adolescents (55.1% male; Mage = 12.70 years; 40.3% White, 28.2% Black, 23.4% Hispanic/Latino, and 7.7% multiracial/other) participated in a well-established experimental chat room paradigm where they were exposed to norms communicated by high- and low-status e-confederates. Results revealed that for boys in the high-status condition only, but not girls, the positive relation between conformity and self-esteem was mediated by greater response alignment with popular peers. These findings bolster prior research by suggesting that conformity to popular peers may be partly motivated by drives for self-esteem and alignment with a valued reference group.

Implementation of a minimally invasive cell culture system to measure the regulation of inflammation in a school-based sample of adolescents.

Dysregulated inflammation underlies many human diseases, and measures of responsiveness to activation, and sensitivity to inhibition, provide important information beyond baseline assessments of chronic inflammation. This study implements a simplified cell culture protocol in a school-based setting, using finger stick capillary blood collected from 333 adolescents (age 11.4-15.6 years) incubated with lipopolysaccharide (LPS). Median cytokine responses for IL6, IL1ß, and TNFα were 61.9, 26.2, and 11.2 pg/mL, respectively. Samples were also incubated with LPS and glucocorticoid (GC) to measure GC sensitivity. Median responses were reduced in the presence of GC inhibition for IL6 (20.3 pg/mL), IL1ß (10.5 pg/mL), and TNFα (3.3 pg/mL). Minimally invasive cell culture protocols provide novel opportunities for measuring inflammatory phenotypes in a wide range of non-clinical settings.

Are there negative cycles of peer victimization and rejection sensitivity? Testing ri-CLPMs in two longitudinal samples of young adolescents.

This study's aim was to examine whether there are negative increasing cycles of peer victimization and rejection sensitivity over time. Drawing from Social Information Processing Theory, we hypothesized that victimization leads to higher levels of rejection sensitivity, which would put adolescents at risk for higher future victimization. Data were collected in a four-wave study with 233 Dutch adolescents starting secondary education (Mage = 12.7 years), and a three-wave study with 711 Australian adolescents in the last years of primary school (Mage = 10.8 years). Random-intercept cross-lagged panel models were used to disentangle between-person from within-person effects. In each sample, a significant between-person association was found: adolescents with higher levels of victimization as compared to their peers also reported higher levels of rejection sensitivity. At the within-person level, all concurrent associations between individual fluctuations of victimization and rejection sensitivity were significant, but there were no significant cross-lagged effects (except in some sensitivity analyses). These findings demonstrate that victimization and rejection sensitivity are interrelated, but there may not be negative victimization-rejection sensitivity cycles during the early-middle adolescent years. Possibly, cycles establish earlier in life or results are due to shared underlying factors. Further research is needed examining different time lags between assessments, age groups, and contexts.

Bullying Perpetration and Victimization as Social Mechanisms in the Development of Borderline Personality Traits during Adolescence: A Longitudinal Study.

INTRODUCTION: Borderline personality features are often associated with toxic social relationships and problematic peer functioning. Less is known, however, about the extent to which bullying experiences may shape the development and maintenance of borderline-related traits during crucial periods of rapid normative developments in impulse and emotion regulation skills. Given the core interpersonal character of borderline personality pathology (BPP), such research focus may be relevant to better understand possible causal social mechanisms in the development of personality difficulties within the borderline trait spectrum. METHOD: The current longitudinal study examined whether experiences of both bullying perpetration and victimization in pre-adolescence mediated the developmental course of BPP traits between childhood and adolescence. To examine these associations, a sample of children (N = 242; 57% girls; Mage = 10.87 years) was recruited and followed up 1 and 4 years later. RESULTS: Mediation analysis indicated that the prospective link between child and adolescent BPP trait vulnerability was shaped by pre-adolescent experiences of bullying victimization, but not by bullying perpetration. DISCUSSION: These results indicate that the continuity between child and adolescent borderline trait features are partly explained by exposure to bullying victimization, indicating that the impact of environmental invalidation on BPP development also extends to the peer context.

Reciprocal associations between peer problems and non-suicidal self-injury throughout adolescence.

BACKGROUND: Peer problems have emerged as important predictors of Non-Suicidal Self-Injury (NSSI) development during adolescence. However, the possibility that adolescents who engage in NSSI may, in turn, be at increased risk for experiencing difficulties with their peers has rarely been examined. This study investigated the reciprocal associations between peer problems (e.g. peer victimization, friendship stress and loneliness) and NSSI throughout adolescence, distinguishing between- and within-person effects. METHOD: Participants were 866 adolescents (54.5% females; Mage = 13.12 years, SD = 0.78), who took part in six waves of data collection. Adolescents completed self-report measures of NSSI, friendship stress and loneliness and they took part in a peer nomination procedure to assess peer victimization. Random Intercept Cross-Lagged Panel Models (RI-CLPMs) were used to estimate within-person cross-lagged effects between each peer problem and NSSI from Grade 7 to 12. RESULTS: After accounting for between-person associations between peer problems and NSSI, results indicated that higher-than-usual levels of NSSI predicted higher-than-usual levels of adolescents' own friendship stress, loneliness and peer victimization at the subsequent time point. Yet, sensitivity analyses revealed that most of these effects were strongly attenuated and explained by within-person fluctuations in depressive symptoms. No within-person cross-lagged effects from peer problems to NSSI were found. CONCLUSIONS: Findings highlight that the associations between peer problems (i.e. friendship stress, loneliness) and NSSI may be largely explained by shared underlying factors; yet, some evidence also suggests that NSSI engagement may increase adolescents' risk to experience difficulties in the relationships with their peers, in part via increases in depressive symptoms.

Exploring joint HPA-inflammatory stress response profiles in adolescent girls: Implications for developmental models of neuroendocrine dysregulation.

Prior research has struggled to differentiate cortisol stress response patterns reflective of well-regulated versus dysregulated hypothalamic-pituitary-adrenal (HPA) axis function among adolescents. Here, we show how exploring profiles of joint HPA-inflammatory stress responsivity, and linking those profiles to pubertal development and peer stress exposure may aid such distinction. Adolescent girls (N = 157, Mage  = 14.72 years, SD = 1.38) at risk for psychopathology completed assessments of salivary cortisol and pro-inflammatory cytokines (i.e., tumor necrosis factor-α, interleukin-1ß, and interleukin-6) prior to and following the Trier Social Stress Test. Adolescents, a close friend, and a caregiver completed questionnaire measures of peer stress and pubertal status. Multitrajectory modeling of adolescents' cortisol and cytokine levels revealed three profiles: low cortisol response-stably low cytokine (n = 75), high cortisol response-stably moderate cytokine (n = 47), and low cortisol response-stably high cytokine (n = 35). Relative to low cortisol response-stably low cytokine, adolescents exhibiting the high cortisol response-stably moderate cytokine profile were more advanced in their pubertal development, but presented with similarly low levels of peer stress exposure. Despite showing cortisol responses that were indistinguishable from low cortisol response-stably low cytokine, adolescents exhibiting the low cortisol response-stably high cytokine profile were more pubertally advanced, but also more likely to have experienced chronic peer strain (self-report) and relational peer victimization (close friend-report). These findings thus illustrate the potential value of taking a multisystem approach to studying adolescent stress responsivity and underscore the importance of considering developmental and social factors when interpreting cortisol stress response patterns. Ultimately, such work may help inform developmental models of neuroendocrine dysregulation and related risk for psychopathology.

Disentangling the effects of peer status and peer victimization on perceived physical health in adolescence.

INTRODUCTION: Although exposure to peer victimization during adolescence has been linked to poorer (perceived) physical health, little is known about how multiple peer stressors may independently and conjointly be related with adolescent physical health outcomes. The current study investigated the unique, interactive, and cumulative effects of peer victimization and two types of peer status (i.e., peer preference and peer popularity) on adolescent perceived physical health, while separating between- and within-person effects. METHODS: Two hundred and thirty-three adolescents (Mage = 12.7 years; 47.2% females) enrolled in two secondary schools in the Netherlands completed self-report measures and sociometric nominations of peer status four times, every 6 months, during the first 2 years of secondary school. RESULTS: Multilevel analysis showed that adolescents who reported higher levels of peer victimization than their peers also reported more perceived physical health problems. Moreover, when adolescents were exposed to higher levels of peer victimization (as compared with their own average levels), they also reported poorer perceived physical health (as compared with their own average levels). No main or interactive effects of peer status were found and the effect of a cumulative peer stress score emerged to be driven by peer victimization. CONCLUSIONS: Findings revealed both between- and within-person effects of peer victimization on perceived physical health, suggesting that peer victimization may be the most salient peer stressor to affect physical health outcomes in adolescence.

The relationship between perceived stress and depressive symptoms in adolescents during high stress: The moderating role of emotion regulation.

INTRODUCTION: This study examined the moderating role of adaptive and maladaptive emotion regulation in the relationship between general perceived stress and depressive symptoms during the first coronavirus disease 2019 (COVID-19) lockdown in March-April 2020 in Belgium, while controlling for past depressive symptoms in 2016. METHODS: Participants were 110 adolescents (55% female; Mage = 16, SDage = 1.80) who filled out different questionnaires assessing maladaptive and adaptive emotion regulation strategies (ERS), perceived stress, and depressive symptoms. RESULTS: Results revealed that only maladaptive ERS statistically significantly moderated the relationship between perceived stress and depressive symptoms. More specifically, the amount of perceived stress is positively associated with the level of depressive symptoms, especially in adolescents who use more maladaptive ERS. CONCLUSION: The repertoire of adaptive ERS might not be sufficient for adolescents to flexibly cope with a highly stressful situation such as the COVID-19 pandemic and lockdown. Study findings highlight the need to support youth, particularly those who use more maladaptive ERS, in adaptively coping with intense stressful life events.

Non-Suicidal Self-Injury in Adolescence: The Role of Pre-Existing Vulnerabilities and COVID-19-Related Stress.

For many adolescents, the COVID-19 pandemic represents a uniquely challenging period, and concerns have been raised about whether COVID-19-related stress may increase the risk for self-injurious behaviors among adolescents. This study examined the impact of pre-existing vulnerabilities on the occurrence and frequency of Non-Suicidal Self-Injury (NSSI) through COVID-19-related stress, and whether the impact of COVID-19-related stress on NSSI was buffered by the perceived social support during the pandemic. Participants were 1061 adolescents (52.40% females; Mage = 15.49 years, SD = 0.76) from a two-wave longitudinal study, which included assessments before the COVID-19 onset and one year later the declaration of the pandemic. Path analyses showed that adolescents with a prior history of NSSI, higher levels of internalizing symptoms, and poor regulatory emotional self-efficacy before the COVID-19 pandemic reported higher levels of COVID-19-related stress which in turn increased their risk to engage in NSSI. Besides, the findings did not support the role of social support as a moderator of the association between COVID-19 related stress and the occurrence/frequency of NSSI. These findings suggest that enhanced stress perception may serve as a key pathway for the continuation and development of NSSI among vulnerable adolescents facing adverse life events.

Determinants of Excessive Reassurance-Seeking: Adolescents' Internalized Distress, Friendship Conflict, and Inhibitory Control as Prospective Predictors.

Substantial research suggests that excessive reassurance-seeking behavior is associated with exacerbations in depressive symptoms and later interpersonal rejection, yet remarkably few studies have examined predictors of this maladaptive social behavior. This study proposed and examined a diathesis stress model suggesting that beyond the effects of prior internalized distress, a combination of poor inhibitory control and dyadic friendship conflict may be especially relevant predictors of adolescents' excessive reassurance-seeking behavior. Longitudinal associations were examined in a sample of 865 adolescents (54.5% female, 22.2% African American, 23.1% Latinx) who completed self-reported measures of depressive rumination/intrusive thoughts, depressive symptoms, loneliness, friendship conflict, and a performance-based measure of inhibitory control at baseline, as well as a measure of excessive reassurance-seeking at baseline and 2 years later. Results initially revealed a prospective effect of depressive rumination/intrusive thoughts on later excessive reassurance-seeking, consistent with prior work. Final results yielded only a significant interaction effect, revealing that higher levels of friendship conflict coupled with low levels of inhibitory control were associated longitudinally with higher levels of excessive reassurance-seeking. Findings suggest that inhibitory control may moderate the association between adolescents' interpersonal conflict and their excessive reassurance-seeking.

Interpersonal life stress, inflammation, and depression in adolescence: Testing Social Signal Transduction Theory of Depression.

BACKGROUND: Depression rates increase markedly for girls across the adolescent transition, but the social-environmental and biological processes underlying this phenomenon remain unclear. To address this issue, we tested a key hypothesis from Social Signal Transduction Theory of Depression, which posits that individuals who mount stronger inflammatory responses to social stress should exhibit greater increases in depressive symptoms following interpersonal life stress exposure than those who mount weaker inflammatory responses to such stress. METHOD: Participants were 116 adolescent girls (Mage = 14.71) at risk for psychopathology, defined as having a history of mental health concerns (e.g., psychiatric treatment, significant symptoms) over the past 2 years. At baseline, we characterized their inflammatory reactivity to social stress by quantifying their salivary proinflammatory cytokine responses to a laboratory-based social stressor. Then, 9 months later, we assessed the interpersonal and noninterpersonal stressful life events that they experienced over the prior 9 months using an interview-based measure of life stress. RESULTS: As hypothesized, greater interpersonal life stress exposure was associated with significant increases in depression over time, but only for girls exhibiting stronger salivary tumor necrosis factor-α and interleukin-1ß reactivity to social stress. In contrast, noninterpersonal stress exposure was unrelated to changes in depression longitudinally, both alone and when combined with youths' cytokine reactivity scores. DISCUSSION: These results are consistent with Social Signal Transduction Theory of Depression and suggest that heightened inflammatory reactivity to social stress may increase adolescents' risk for depression. Consequently, it may be possible to reduce depression risk by modifying inflammatory responses to social stress.

Future Directions in Peer Relations Research.

Peer relationships among youth have been examined as predictors of mental health outcomes for at least fifty years, revealing dozens of discrete peer constructs that each are associated with adjustment in childhood, adolescence, and later in adulthood. Future research may benefit by examining a range of new outcomes and psychological processes that have been discussed recently in related literatures. This paper reviews recent research on interpersonal determinants of physical health outcomes, and opportunities for greater examination of 1) peer influence processes toward health risk behaviors; 2) neural correlates of peer adversity; 3) adverse peer experiences that may affect physiological markers of stress response; and 4) immune system markers of peer adversity. Additional future directions include the study of differences in the forms and functions of peer interactions within the digital age.

A Usability Study of Physiological Measurement in School Using Wearable Sensors.

Measuring psychophysiological signals of adolescents using unobtrusive wearable sensors may contribute to understanding the development of emotional disorders. This study investigated the feasibility of measuring high quality physiological data and examined the validity of signal processing in a school setting. Among 86 adolescents, a total of more than 410 h of electrodermal activity (EDA) data were recorded using a wrist-worn sensor with gelled electrodes and over 370 h of heart rate data were recorded using a chest-strap sensor. The results support the feasibility of monitoring physiological signals at school. We describe specific challenges and provide recommendations for signal analysis, including dealing with invalid signals due to loose sensors, and quantization noise that can be caused by limitations in analog-to-digital conversion in wearable devices and be mistaken as physiological responses. Importantly, our results show that using toolboxes for automatic signal preprocessing, decomposition, and artifact detection with default parameters while neglecting differences between devices and measurement contexts yield misleading results. Time courses of students' physiological signals throughout the course of a class were found to be clearer after applying our proposed preprocessing steps.

Peer Victimization Trajectories at the Adolescent Transition: Associations Among Chronic Victimization, Peer-Reported Status, and Adjustment.

The current study demonstrated that chronic peer victimization, as compared to time-limited victimization, is particularly associated with peer status and peer-reported adjustment at the adolescent transition. Using a cohort sequential design, a sample of 653 adolescents (48% female, 87% Caucasian) in Grades 6-8 were assessed at 3 annual time points; data captured indices of peer victimization, likeability, popularity, and several peer-reported indices of internalizing (e.g., sadness, worry) and externalizing (e.g., anger, fighting) symptoms across Grades 6-10. Four trajectories of victimization experiences were identified-chronic, high decreasing, low increasing, and low stable-suggesting instability in victimization experiences over time. Adolescents who experienced chronic victimization, as compared to those with low-stable, decreasing, or increasing levels of victimization, were rated by peers more often on indices of maladjustment and less often on measures of popularity and likeability. Findings highlight negative associations with chronic victimization and underscore the need for targeted interventions to prevent chronic victimization. Overall, findings further emphasize the role of chronicity in victimization and highlight the importance of identifying chronic victims for intervention and prevention efforts.

Preliminary Associations among Relational Victimization, Targeted Rejection, and Suicidality in Adolescents: A Prospective Study.

This study examined associations between multiple types of interpersonal and noninterpersonal stressors and the subsequent occurrence of suicide ideation and attempts among female adolescents. Adolescents ages 12 to 18 years old (n = 160) at elevated risk for suicidal thoughts and behaviors were followed for 18 months, divided into two 9-month epochs for data analysis (Periods 1 and 2). Exposure to acute relational victimization, targeted rejection, nonspecified interpersonal, and noninterpersonal life stressors over the first 9-month epoch (Period 1) was assessed using semistructured interviews and an independent life stress rating team. Participants also completed phone-based semistructured interviews of suicidal thoughts and behaviors. Preliminary analyses showed significant prospective associations between acute targeted rejection and nonspecified interpersonal stress during Period 1 and suicide ideation during Period 2, as well as relational victimization and noninterpersonal stress during Period 1 and suicide attempts during Period 2. However, in logistic regression analyses that adjusted for prior suicidality and depressive symptoms, relational victimization during Period 1 (but not targeted rejection, nonspecified interpersonal or noninterpersonal events) was associated with increased odds of suicide attempt during Period 2. Therefore, acute relational victimization exposure is associated with heightened risk for suicidal behaviors in female adolescents. Future studies should examine potential mediators and moderators of this association, and these stressors should be considered for inclusion in clinical screening tools.

Peer victimization predicts heightened inflammatory reactivity to social stress in cognitively vulnerable adolescents.

BACKGROUND: During adolescence, peer victimization is a potent type of social stressor that can confer enduring risk for poor mental and physical health. Given recent research implicating inflammation in promoting a variety of serious mental and physical health problems, this study examined the role that peer victimization and cognitive vulnerability (i.e. negative cognitive styles and hopelessness) play in shaping adolescents' pro-inflammatory cytokine responses to an acute social stressor. METHODS: Adolescent girls at risk for psychopathology (n = 157; Mage  = 14.73 years; SD = 1.38) were exposed to a laboratory-based social stressor before and after which we assessed salivary levels of three key pro-inflammatory cytokines - interleukin-6 (IL-6), interleukin-1ß (IL-1ß), and tumor necrosis factor-α (TNF-α). RESULTS: As hypothesized, adolescents with greater peer victimization exposure exhibited greater increases in IL-6 and IL1-ß in response to the laboratory-based social stressor. Moreover, for all three cytokines individually, as well as for a combined latent factor of inflammation, peer victimization predicted enhanced inflammatory responding most strongly for adolescents with high levels of hopelessness. CONCLUSIONS: The findings reveal a biological pathway by which peer victimization may interact with cognitive vulnerability to influence health in adolescence.

Suicide ideation among high-risk adolescent females: Examining the interplay between parasympathetic regulation and friendship support.

Poor physiological self-regulation has been proposed as a potential biological vulnerability for adolescent suicidality. This study tested this hypothesis by examining the effect of parasympathetic stress responses on future suicide ideation. In addition, drawing from multilevel developmental psychopathology theories, the interplay between parasympathetic regulation and friendship support, conceptualized as an external source of regulation, was examined. At baseline, 132 adolescent females (M age = 14.59, SD = 1.39) with a history of mental health concerns participated in an in vivo interpersonal stressor (a laboratory speech task) and completed self-report measures of depressive symptoms and perceived support within a close same-age female friendship. Respiratory sinus arrhythmia (RSA) was measured before and during the speech task. Suicide ideation was assessed at baseline and at 3, 6, and 9 months follow-up. The results revealed that females with greater relative RSA decreases to the laboratory stressor were at higher risk for reporting suicide ideation over the subsequent 9 months. Moreover, parasympathetic responses moderated the effect of friendship support on suicide ideation; among females with mild changes or higher relative increases in RSA, but not more pronounced RSA decreases, friendship support reduced risk for future suicide ideation. Findings highlight the crucial role of physiological and external regulation sources as protective factors for youth suicidality.

Bully Victimization: Selection and Influence Within Adolescent Friendship Networks and Cliques.

Adolescents tend to form friendships with similar peers and, in turn, their friends further influence adolescents' behaviors and attitudes. Emerging work has shown that these selection and influence processes also might extend to bully victimization. However, no prior work has examined selection and influence effects involved in bully victimization within cliques, despite theoretical account emphasizing the importance of cliques in this regard. This study examined selection and influence processes in adolescence regarding bully victimization both at the level of the entire friendship network and the level of cliques. We used a two-wave design (5-month interval). Participants were 543 adolescents (50.1% male, Mage = 15.8) in secondary education. Stochastic actor-based models indicated that at the level of the larger friendship network, adolescents tended to select friends with similar levels of bully victimization as they themselves. In addition, adolescent friends influenced each other in terms of bully victimization over time. Actor Parter Interdependence models showed that similarities in bully victimization between clique members were not due to selection of clique members. For boys, average clique bully victimization predicted individual bully victimization over time (influence), but not vice versa. No influence was found for girls, indicating that different mechanisms may underlie friend influence on bully victimization for girls and boys. The differences in results at the level of the larger friendship network versus the clique emphasize the importance of taking the type of friendship ties into account in research on selection and influence processes involved in bully victimization.

Ethnic differences in associations among popularity, likability, and trajectories of adolescents' alcohol use and frequency.

Two-part latent growth models examined associations between two forms of peer status (popularity, likability) and adolescents' alcohol use trajectories throughout high school; ethnicity was examined as a moderator. Ninth-grade low-income adolescents (N = 364; Mage = 15.08; 52.5% Caucasian; 25.8% African American; 21.7% Latino) completed sociometric nominations of peer status and aggression at baseline, and reported their alcohol use every 6 months. After controlling for gender, aggression, ethnicity, and socioeconomic status, popularity-but not likability-prospectively predicted alcohol use trajectories. However, these effects were moderated by ethnicity, suggesting popularity as a risk factor for alcohol use probability and frequency among Caucasian and Latino, but not African American adolescents. Results suggest that developmental correlates of peer status should be considered within cultural context.

Peer Influence, Peer Status, and Prosocial Behavior: An Experimental Investigation of Peer Socialization of Adolescents' Intentions to Volunteer.

Peer influence processes have been documented extensively for a wide range of maladaptive adolescent behaviors. However, peer socialization is not inherently deleterious, and little is known about whether adolescents influence each other's prosocial behaviors, or whether some peers are more influential than others towards positive youth outcomes. This study addressed these questions using an experimental "chat room" paradigm to examine in vivo peer influence of prosocial behavior endorsement. A school-based sample of 304 early adolescents (55% female, 45% male; M(age) = 12.68) believed they were interacting electronically with same-gender grademates (i.e., "e-confederates"), whose peer status was experimentally manipulated. The participants' intent to engage in prosocial behaviors was measured pre-experiment and in subsequent "public" and "private" experimental sessions. Overall, the adolescents conformed to the e-confederates' prosocial responses in public; yet, these peer influence effects were moderated by the peer status of the e-confederates, such that youth more strongly conformed to the high-status e-confederates than to the low-status ones. There also was some evidence that these peer influence effects were maintained in the private session, indicating potential internalization of prosocial peer norms. These findings help bridge the positive youth development and peer influence literatures, with potential implications for campaigns to increase prosocial behaviors.