The Interplay of Peer Victimization and Parasympathetic Nervous System Activity on Acute Inflammatory Stress Responses in Adolescence

This study examined the extent to which adolescent peer victimization predicted acute inflammatory responses to stress, and whether both resting parasympathetic nervous system (PNS) activity and PNS stress reactivity moderated this association. 83 adolescents (Mage = 14.89, SDage = 0.52, 48% female) reported their history of peer victimization and were exposed to a standardized social stress task before and after which dried blood spot samples were collected to assay inflammatory markers. Inflammatory responses to the stress task were assessed with a latent inflammatory change factor using the cytokines interleukin-6 (IL-6), interleukin-10 (IL-10), and tumor necrosis factor-α (TNF-α). PNS functioning, indexed by high-frequency heart rate variability, was measured at rest and during the stressor. Contrary to hypotheses, analyses revealed no direct relation between peer victimization and acute inflammatory responses, and resting PNS activity did not moderate this association. However, peer victimization predicted stronger inflammatory responses among adolescents with weaker PNS reactivity to the stress task (b = 0.63, p = .02). This association was not observed among adolescents with stronger PNS reactivity, for whom a negative but non-significant trend was found. Weaker PNS reactivity may thus indicate victimized adolescents' vulnerability for acute inflammatory responses, whereas stronger PNS reactivity may indicate adolescents' resilience to a social stressor.

Empathy, Defending, and Functional Connectivity While Witnessing Social Exclusion

Peers are present for most bullying episodes. Peers who witness bullying can play an important role in either stopping or perpetuating the behaviour. Defending can greatly benefit victimized peers. Empathy is strongly associated with defending. Yet, less is known about defenders' neural response to witnessing social distress, and how this response may relate to the link between empathy and defending. Forty-six first-year undergraduate students (M_age = 17.7; 37 women), with varied history of peer defending, underwent fMRI scanning while witnessing a depiction of social exclusion. Functional connectivity analysis was performed across brain regions that are involved in cognitive empathy, empathetic distress, and compassion. History of defending was positively associated with functional connectivity (Exclusion > Inclusion) between the left orbitofrontal cortex (OFC) - medial prefrontal cortex (MPFC), and right OFC - left and right amygdalae. Defending was negatively associated with functional connectivity between the left OFC - anterior cingulate cortex. The relationship between history of defending and empathy (specifically, empathetic perspective taking) was moderated by functional connectivity of the right OFC - left amygdala. These findings suggest that coactivation of brain regions involved in compassionate emotion regulation and empathetic distress play a role in the relationship between empathy and peer defending.

Indirect effects of HPA axis dysregulation in the association between peer victimization and depressed affect during early adolescence

OBJECTIVE

Previous research has identified a link between peer victimization and depressive symptoms during adolescence. The goal of the current study is to examine the possible indirect effects of HPA axis dysregulation in the link between adolescent peer victimization and depressive symptoms.

METHOD

A total of 113 boys (n = 61) and girls (n = 52) participants from grade 5 (M age = 10.31 years) and grade 6 (M age = 11.33 years) who were predominantly European-Canadian completed self-report measures of peer victimization and depressed affect as well as, measures of salivary cortisol and self-reports of negative experiences collected in conjunction with one another five times per day over the course of four school days.

RESULTS

Multi-level structural equation modeling found that peer victimization was indirectly associated with depressive symptoms via blunted cortisol reactivity (i.e. increases in cortisol in response to a negative event) but only at high rates of chronic peer victimization.

CONCLUSION

The findings suggest that future studies should focus on HPA axis dysregulation for better understand the development, as well as the stability of depression over time and that interventions targeting peer victimization may want to put a special focus on those who are chronically experiencing peer victimization over time.

Risk and Protective Pathways to Peer Victimization from Infancy to Adolescence: Role of Fathers

This study examined the developmental pathways from fathers' psychopathology in early childhood to child peer victimization (bullying and cyber victimization) in late adolescence via family relationships and early adolescent psychosocial functioning (anxiety, emotion regulation, social problems). A conceptual model with pathways through inter-parental aggression and fathers' parenting (harshness and sensitivity) was tested. Participants were 227 families (51% female children recruited as infants) who participated in a longitudinal study examining the role of parental alcohol problems and associated risks on developmental and family processes from infancy to late adolescence. Multi-method (observational, parent report, adolescent report) assessments of family processes and child outcomes were conducted across all time points. Fathers' alcohol problems and depressive symptoms in early childhood was prospectively associated with inter-parental aggression in middle childhood and social problems in early adolescence. For boys only, early adolescent social problems were predictive of bullying victimization. Fathers' antisocial behavior in early childhood was associated with less sensitive parenting in middle childhood. Fathers' sensitivity in middle childhood was protective, being associated with lower cyber victimization in late adolescence. Fathers' sensitivity was also associated with higher emotion regulation in early adolescence; however, counter to expectations, higher emotion regulation was associated with more bullying and cyber victimization. Findings shed light on differences in the etiological pathways to bullying and cyber victimization, as well as how distinct forms of paternal psychopathology in early childhood associate with family relationships, child adjustment, and vulnerability to peer victimization in late adolescence.

Prospective associations between peer functioning and social anxiety in adolescents: A systematic review and meta-analysis

BACKGROUND

During adolescence, peer relationships take precedence and there is a normative increase in social anxiety. Although prospective studies have suggested peer functioning and social anxiety can influence each other, their findings have not been examined systematically. We performed a systematic review and meta-analysis of prospective studies to examine the bidirectional relationship between peer functioning and social anxiety in adolescence.

METHODS

EMBASE, PsycINFO, Medline, and PubMed were searched to identify relevant articles. Meta-analysis was conducted to examine the mean effect sizes of prospective associations between social anxiety and four dimensions of peer functioning. Moderator analysis was performed, with age, gender, time interval between baseline and follow-up assessment, and publication year as moderators.

RESULTS

Meta-analyses of 23 studies showed that friendship quality (r =-.11), peer rejection (r =-.06), and peer victimization (r =.23) were each associated with later social anxiety, but peer acceptance was not (r =-.11). Social anxiety at baseline was associated with prospective levels of friendship quality (r =-.11), peer rejection (r=.09), and peer victimization (r =.17), but not peer acceptance (r =-.14). Age moderated the association between friendship quality and prospective social anxiety. Other moderator effects were statistically non-significant.

LIMITATIONS

Limitations include different classifications of peer functioning, the use of self-report measures, heterogeneity between studies, and underrepresentation of clinical samples.

CONCLUSIONS

A significant bidirectional association was found with social anxiety across three dimensions of peer functioning. Psychological prevention and intervention targeting peer functioning and social anxiety are indicated.

Does Social Exclusion Alter Sensory and Pain Thresholds in Children and Adolescents with Functional Abdominal Pain? - Results from a Preliminary Study

OBJECTIVE

Functional abdominal pain (AP) is a prevalent issue in childhood and adolescence. The contribution of psychosocial factors in the development and maintenance of this health problem is rather unclear, and experimental studies about underlying mechanisms are lacking. This study investigates whether experimentally induced social exclusion decreases sensory and pain thresholds in children suffering from AP.

SUBJECTS

Twenty children/adolescents with AP and 22 healthy controls.

METHODS

Children/adolescents participated in the Cyberball paradigm, which affects an experience of social exclusion. Thermal sensory and pain thresholds were measured before and after Cyberball.

RESULTS

Children/adolescents with AP showed a divergent reaction regarding their sensory threshold after social exclusion: The control group exhibited a tendency toward a decreased sensory threshold whereas the AP group remained stable. Concerning the pain threshold, no effect of social exclusion could be identified. The increase of both thresholds ("numbing") after Cyberball was positively correlated with symptoms of mental health issues.

CONCLUSIONS

This is the first study to investigate changes in sensory and pain thresholds following painful social interactions in a sample of children/adolescents with a chronic pain condition. Results suggest that AP and control children differ in their reaction of sensory thresholds, which might indicate an altered processing of social exclusion. Replication and further methodological improvements are needed.

Relational Peer Victimization Interacts With Depression Severity to Predict the Timing of Alcohol Use Initiation in Adolescent Girls

BACKGROUND

Peer victimization is consistently linked to adolescents' alcohol use. However, the relative influence of relational and physical peer victimization on alcohol use, and timing of drinking initiation, is not well understood. In this study, we evaluate the impact of both relational and physical peer victimization on adolescent girls' alcohol use initiation, and the extent to which depression severity moderates these associations.

METHODS

Participants were 2,125 girls in the Pittsburgh Girls Study, a longitudinal community-based study. Participants reported experiences of relational and physical peer victimization, depression severity, and alcohol use each year from ages 10 to 17. Cox proportional hazards (PH) regression analyses predicting the timing of first drink were conducted in 2 stages, testing for main effects of peer victimization in Model 1 and moderation by depression severity in Model 2.

RESULTS

Analyses were split at age 14 to adjust for PH violations. Model 1 results supported a main effect for relational (Hazards ratio [HR] = 1.83, CI: 1.46 to 2.28 ≤ age 13; HR = 1.23, CI: 1.05 to 1.45 ≥ age 14) but not physical victimization on timing of alcohol use onset (HR = 1.10, CI: 0.88 to 1.39). Model 2 results show that depression severity moderates the association between relational victimization and alcohol use initiation: the association between relational victimization and early alcohol use onset was stronger for lower depression severity (-1 SD HR = 2.38, CI: 1.68 to 3.39 ≤ age 13; -1 SD HR = 1.48, CI: 1.10 to 1.52 ≥ age 14).

CONCLUSIONS

Results demonstrate that relational (and not physical) victimization predicts earlier drinking among adolescent girls. Relational peer victimization conferred greater risk for alcohol use initiation when depression severity was lower, whereas girls with high depression severity engaged in early alcohol use regardless of peer victimization. Results suggest that interventions focused on relational peer victimization may have spillover effects for delaying girls' alcohol use initiation, particularly in early adolescence, when this association is most robust.

Adolescents' explicit and implicit evaluations of hypothetical and actual peers with different bullying participant roles

This study examined how adolescents evaluate bullying at three levels of specificity: (a) the general concept of bullying, (b) hypothetical peers in different bullying participant roles, and (c) actual peers in different bullying participant roles. Participants were 163 predominantly ethnic majority adolescents in The Netherlands (58% girls; M_age=16.34years, SD=0.79). For the hypothetical peers, we examined adolescents' explicit evaluations as well as their implicit evaluations. Adolescents evaluated the general concept of bullying negatively. Adolescents' explicit evaluations of hypothetical and actual peers in the bullying roles depended on their own role, but adolescents' implicit evaluations of hypothetical peers did not. Adolescents' explicit evaluations of hypothetical peers and actual peers were different. Hypothetical bullies were evaluated negatively by all classmates, whereas hypothetical victims were evaluated relatively positively compared with the other roles. However, when adolescents evaluated their actual classmates, the differences between bullies and the other roles were smaller, whereas victims were evaluated the most negatively of all roles. Further research should take into account that adolescents' evaluations of hypothetical peers differ from their evaluations of actual peers.

Preventing Adolescent Social Anxiety and Depression and Reducing Peer Victimization: Intervention Development and Open Trial

BACKGROUND

Social anxiety disorder (SAD) and depression are common among adolescents, frequently comorbid, and resistant to change. Prevention programs for adolescent SAD are scant, and depression prevention programs do not fully address peer-risk factors. One critical peer-risk factor for SAD and depression is peer victimization. We describe the development and initial evaluation of a transdiagnostic school-based preventive intervention for adolescents with elevated symptoms of social anxiety and/or depression and elevated peer victimization. We modified Interpersonal Psychotherapy-Adolescent Skills Training for depression, incorporating strategies for dealing with social anxiety and peer victimization.

OBJECTIVE

Our open trial assessed the feasibility, acceptability, and preliminary benefit of the modified program (called UTalk) for adolescents at risk for SAD or depression and who also reported peer victimization.

METHOD

Adolescents (N=14; 13-18 years; 79% girls; 86% Hispanic) were recruited and completed measures of peer victimization, social anxiety, and depression both pre- and post-intervention and provided ratings of treatment satisfaction. Independent evaluators (IEs) rated youths' clinical severity. The intervention (3 individual and 10 group sessions) was conducted weekly during school.

RESULTS

Regarding feasibility, 86% of the adolescents completed the intervention (M attendance=11.58 sessions). Satisfaction ratings were uniformly positive. Intention-to-treat analyses revealed significant declines in adolescent- and IE-rated social anxiety and depression and in reports of peer victimization. Additional secondary benefits were observed.

CONCLUSIONS

Although further evaluation is needed, the UTalk intervention appears feasible to administer in schools, with high satisfaction and preliminary benefit. Implications for research on the prevention of adolescent SAD and depression are discussed.