Aggressive Youth Research Articles

A Pilot Controlled Trial of Relaxation Training Combined with a Video Game Reinforcing Emotional Regulation to Improve Anger Management in Children and Adolescents.

Untreated anger and aggression in youth confer heightened risk for subsequent psychosocial problems. However, engaging youth in treatment for anger can be difficult given barriers to accessing care and high rates of attrition. This study examined whether learning relaxation skills and practicing them using a videogame, whose operation was contingent upon keeping heart rate close to baseline levels, could help children learn to manage anger and aggression. Youth ages 7-17 with elevated levels of anger (N = 39) were randomized to receive the active video game condition or a control game that displayed heart rate but did not stop the game if heart rate became elevated. Youth underwent baseline screening, 6 treatment sessions, and follow-up assessments at 2-weeks and 3-months. Compared to the control condition, children in the active condition demonstrated significantly greater improvements in clinician-rated aggression severity (d = 1.48) and youth-rated emotion dysregulation (d = 3.46) at 2-weeks post-treatment. The active group maintained these improvements at 3-month follow-up, but no longer significantly differed from the control group. Intervention effects were nonsignificant for parent-reported emotion dysregulation and aggression. In addition, the intervention group youth, but not control group, experienced increased time with heart rate below baseline over the course of the 6 sessions. Findings suggest a promising brief intervention for reducing aggression and emotion dysregulation in children while they are waiting for longer-term outpatient therapy. Clinical Trial Registration Number: NCT03270813.

Characteristics and correlates of aggressive behavior in autistic youths.

This study aimed to characterize aggressive behaviors in autistic youths and to identify the social environment variables most strongly linked with aggression in this clinical population. Participants were 2142 caregivers of autistic youths (ages 6.0-17.9) recruited from autism research centers across the United States. Caregivers completed self-report and behavior rating inventories that assessed both verbal and physical aggression as well as characteristics of the individual youths (sleep quality, gastrointestinal [GI] symptoms, and autism characteristics) and their families (caregiver stress, global family functioning, and sibling relations), peers (emotional bonding, number of friends), schools (academic functioning), and neighborhoods (perceived community safety). We used descriptive analyses to identify which aggressive acts were most common among autistic youths, and we performed bivariate correlations and multiple linear regression analyses to determine which characteristics of the youths and their social environments were most strongly linked with youth aggression. Verbally aggressive youth behaviors were endorsed by caregivers most frequently. Youth age and sex were not associated with verbal or physical aggression. A combination of youth and social environment characteristics accounted for 42.6% of the variance in verbal aggression and 26.0% of the variance in physical aggression. Thus, those characteristics most strongly linked with verbal and physical aggression were strained sibling relations, caregiver stress, youth sleep problems, and youth repetitive and restrictive behaviors. Viewed together, the results suggest that aggressive behaviors in autistic youths are associated with multiple characteristics pertaining to the individual youths and their immediate social environments. Implications for treatment and research are discussed.

Testosterone, Digit Ratio, and Aggression Among Youth in Conflict with the Law in Kano, Nigeria

Abstract Introduction: Studies have associated testosterone with aggression, although with a weak and sometimes equivocal one. This study aimed to determine the correlation between testosterone and digit ratio (r2D:4D) using measures of aggression in youth in conflict with the law in Kano, Nigeria. Materials and Methods: This case–control study involves 48 youth aged 11–16 years in conflict with the law living in a remand home. The participants were divided into two groups based on the reported history of violent behavior. Serum total testosterone level was determined using an ELISA kit. Aggression was determined by the Buss–Perry Aggression Questionnaire, whereas r2D:4D was measured directly using a digital caliper. Independent-sample t test was used to determine differences in quantitative variables, while Pearson’s correlation analysis was used to determine the correlation. Results: The mean age of the participants is 15.23 years. Serum testosterone level was positively correlated with anger (r = 0.327, P = 0.023) among all participants and with physical aggression (r = 0.405, P = 0.032) among those with a history of violent behavior. However, r2D:4D did not correlate with aggression or serum testosterone. Testosterone explained 22% of variance in physical aggression and is a predictor of physical aggression (P = 0.046) among all study participants. Among those with a history of violent behavior, testosterone explained 41% of variance in physical aggression (P = 0.032); a 1 nmol increase in testosterone increases the physical aggression score by 0.41. Conclusion: testosterone level is positively correlated with anger and physical aggression in youth in conflict with the law in Kano, Nigeria, while the digit ratio is not.

Impulsiveness, suicide, and aggression in a sample of patients with disorders of methyl amphetamine use.

Research has showed a link between patients with methamphetamine dependence and the risk of impulsiveness, aggression, and the risk of suicide. But, this link has not been studied in patients abusing methamphetamine, and it is unknown how impulsiveness, aggression, and the risk of suicide affect them. This cross-sectional study included 130 adult patients diagnosed with the disorder of the use of amphetamine, methamphetamine, cannabinoids, alcohol, other substances, and polysubstance admitted in the Addiction Department for Mental Health. Participants were interviewed for detailed psychiatric history using a structured questionnaire comprising of structured clinical interview for diagnosis I, Arabic version of the Barratt Impulsiveness Scale-11 (BIS), Beck Scale for Suicidal Ideation for the evaluation of suicidal ideation and behavior, and the Aggression and Hostility scale for adolescents and youth. SPSS was used for data analysis; Initial analysis included descriptive statistics: frequencies and percentages for categorical variables and mean and standard deviation for continuous variables. Chi-square test/Fisher's exact test assessed for association between categorical variables, whereas one-way analysis of variance (ANOVA)/ Kruskal-Wallis test was used to compare continuous variables. Patients who used methamphetamine either alone (23%) or with polysubstance (42.6%) were associated with higher suicidal risk than patients who did use other substances than methamphetamine (36.1%). A comparison of the three groups on impulsivity, showed significant difference regarding total scores, motor preservation, and non-planning self-control. No significant differences found between three groups on the aggression scores. There was a higher rate of impulsivity and suicidal risk in patients with methamphetamine dependence in comparison to dependence on other substances, while there was no difference with regard to aggression between patients with methamphetamine dependence and those dependent on other substances. This finding raises the issue of methamphetamine use disorder as a new substance of dependence.

Being on top versus not dangling at the bottom: Popularity motivation and aggression in youth.

Whereas research on aggression and status motivation in youth has predominantly looked at a promotion focus (striving for popularity), a prevention focus (wanting to avoid low popularity) could also be an important determinant of aggression, as youth who fear low popularity may use strategic aggression to secure their position. The aim of the current study was to develop reliable measures for both popularity motivations, and examine how both motivations are uniquely and jointly related to aggression. Participants were 1123 Dutch secondary school students (M age = 14.4 years, 48% girls), who completed a 3-item measure of striving for high popularity based on existing questionnaires (Li & Wright, 2014; Ojanen et al., 2005), and a 3-item measure of avoiding low popularity consisting of an adapted version of the high popularity items. Aggressive behavior was measured through peer nominations. Motivations were moderately correlated (r = .51), but did not always co-occur within the same person, as 17% of the sample belonged to a cluster that scored low on striving for popularity, but moderately high on avoiding low popularity. When considered simultaneously, striving for high popularity was not related to any type of aggression, whereas avoiding affiliation with unpopular peers was related to strategic aggression. For physical and verbal aggression, gossiping, excluding and bullying, the association of avoiding low popularity with aggression was strongest when youth also strived for high popularity. Future work should take both popularity motivations into account to better understand, predict and intervene on youth's aggression toward peers.

EPIDEMIC OF CRUELTY: THE STATE AND CATHOLIC CHURCH IN ITALY AGAINST BULLYING

The article deals with bullying and cyberbullying. The serious consequences of traditional bullying and virtual bullying in social networks, which seriously harm the mental and physical health of children and adolescents, force them into suicide, make school bullying one of the most current social problems. The author set out to analyze the measures taken by the Italian State and the Catholic Church in Italy to prevent this phenomenon. Bullying manifests, the systemic crisis in secular societies. It was caused by a number of factors, including: dominance in the public consciousness of deviant cultural codes, stereotypes and norms that legalize the use of violence; atomization and secularization of society, failure of today’s educational tactics, uncontrolled digitization, aggressive models of «new humanism» and transhumanism, ethical relativism. Lay and Catholic pedagogues agree that the efforts of the family, educational institutions, ecclesiastical parishes and law enforcement should aim not only to eradicate bullying, but also to channel youth aggression in a creative direction. It is also necessary to stimulate a positive microclimate in school communities. However, the Italian State and the Catholic Church have different approaches to solving the problem: the State will give preference to repressive methods of education, while the Church – to preventive pedagogy.

Clozapine Treatment for Aggressive Behaviors in Youths with Neurodevelopmental Disorders.

Objectives: The aim of this study was to assess effectiveness and tolerability of Clozapine in the treatment of aggression in youth with Neurodevelopmental Disorders. Methods: Patients were consecutively admitted at our third-level university hospital with nationwide catchment from June 2018 to October 2022, and followed up to July 2023. Eligibility criteria were as follows: (1) Autism Spectrum Disorder (ASD) and/or Intellectual Disability/Borderline Cognitive Functioning, (2) behavioral dyscontrol with physical aggression; (3) age range between 8 and 18 years; (4) clinical indication for Clozapine treatment after at least two failed trials with other Second-Generation Antipsychotics (SGAs); (5) availability of an at least 6-month-long follow-up. To evaluate the response to Clozapine, we used the Clinical Global Impressions (CGI) rating scales (Clinical Global Impressions-Severity [CGI-S] and Clinical Global Impressions-Improvement [CGI-I]), the Children's Global Assessment Scale (CGAS), and the Aberrant Behavior Checklist (ABC). Results: Twenty-six children and adolescents (21 boys, age 13.47 ± 2.05 years, follow-up duration 9.77 ± 3.50 months) were included in the analysis. Clinical severity (CGI-S) and functional impairment (Clinical Global Assessment Scale) significantly improved, as well as the ABC Total Score and the scores in several subscales. Sixteen patients (61.54%) were responders (CGI-I ≤2), and 13 (50.00%) displayed remission of aberrant behaviors (ΔABC-Total >35), while response/remission condition was not affected by add-on medications and psychotherapy. Most frequent side effects were increased appetite (50.00%), sialorrhea (38.46%), and increased repetitive behaviors (26.92%). Two patients presented epileptic seizures, while no patients presented leucopoenia. Conclusions: Our results suggest that Clozapine may be helpful in ameliorating treatment-resistant aggression in youth with neurodevelopmental conditions. Possible pharmacological strategies for the management of most frequent side effects are also suggested.

Communicative Behavior of Mass Culture Icon Villain and the Influence on Destructive Behavior in Youth. Joker’s Case

This article examines the potential influence of iconic characters—villains of mass culture—on destructive and aggressive youth behavior. The cultivation of certain societal groups and individual media characters can lead to the normalization of hostility and violence. This study analyzes the communication styles, intelligence, motives, aggression levels, and violent actions of famous villains from films, television, and literature. Particular attention is paid to the Joker’s communicative behavior, dialogues, and language, examining how he psychologically manipulates others and conveys his destructive views through unconventional techniques. Using textual examples from comic books and films, it analyzes how the Joker’s language choices and performative style reflect his background and moral-anarchic worldview. His rhetoric provokes violent reactions from allies and enemies alike, highlighting his ability to destabilize situations. The presented portrait reveals a multi-layered understanding of this legendary creation in different epochs and contexts. The findings indicate certain villain traits that could potentially encourage impressionable youth to engage in harmful behavior. Overall, provocative fiction has a double-edged significance as it can both shape and mislead developing minds. Recommendations are made to reduce the negative effects of glamorizing villains in entertainment media.

Omega-3 Supplementation Reduces Schizotypal Personality in Children: A Randomized Controlled Trial.

Based on a childhood intervention from ages 3 to 5 years that included additional fish consumption and which resulted in reduced schizotypal personality at age 23, we had previously hypothesized that omega-3 could reduce schizotypy. The current study tests the hypothesis that omega-3 supplementation reduces schizotypy in children. In this intention-to-treat, randomized, single-blind, stratified, factorial trial, a community sample of 290 children aged 11-12 years were randomized into Omega-3 Only, Cognitive Behavioral Therapy (CBT) Only, Omega-3 + CBT, and Control groups. Schizotypy was assessed using the SPQ-C (Schizotypal Personality Questionnaire for Children) at 0 months (baseline), 3 months (end of treatment), 6 months (3 months post-treatment), and 12 months (9 months post-treatment). A significant group × time interaction (P = .013) indicated that, compared with Controls, total schizotypy scores were reduced in both Omega-3 Only and Omega-3 + CBT groups immediately post-treatment (d = 0.56 and 0.47, respectively), and also 3 months after supplementation terminated (d = 0.49, d = 0.70). Stronger findings were observed for the interpersonal schizotypy factor, with both omega-3 groups showing reductions 9 months post-treatment compared with the CBT Only group. Schizotypy reductions were significantly stronger for those with higher dietary intake of omega-3 at intake. Sensitivity analyses confirmed findings. Results are unique in the field and suggest that omega-3 can help reduce schizotypal personality in community-residing children. From an epidemiological standpoint, if replicated and extended, these findings could have implications for early prevention of more significant schizotypal features developing later in adolescence. "Healthy Brains & Behavior: Understanding and Treating Youth Aggression (HBB)." ClinicalTrials.gov Identifier: NCT00842439, https://clinicaltrials.gov/ct2/show/NCT00842439.

Evidence Base Update on the Assessment of Irritability, Anger, and Aggression in Youth

ABSTRACT Objective Irritability, anger, and aggression have garnered significant attention from youth mental health researchers and clinicians; however, fundamental challenges of conceptualization and measurement persist. This article reviews the evidence base for assessing these transdiagnostic constructs in children and adolescents. Method We conducted a preregistered systematic review of the evidence behind instruments used to measure irritability, anger, aggression, and related problems in youth. Searches were conducted in PsycINFO and PubMed, identifying 4,664 unique articles. Eligibility criteria focused on self- and proxy-report measures with peer-reviewed psychometric evidence from studies in English with youths ages 3–18. Additional measures were found through ancillary search strategies (e.g. book chapters, review articles, test publishers). Measures were screened and coded by multiple raters with acceptable reliability. Results Overall, 68 instruments met criteria for inclusion, with scales covering irritability (n = 15), anger (n = 19), aggression (n = 45), and/or general overt externalizing problems (n = 27). Regarding overall psychometric support, 6 measures (8.8%) were classified as Excellent, 46 (67.6%) were Good, and 16 (23.5%) were Adequate. Descriptive information (e.g. informants, scales, availability, translations) and psychometric properties (e.g. reliability, validity, norms) are summarized. Conclusions Numerous instruments for youth irritability, anger, and aggression exist with varying degrees of empirical support for specific applications. Although some measures were especially strong, none had uniformly excellent properties across all dimensions, signaling the need for further research in particular areas. Findings promote conceptual clarity while also producing a well-characterized toolkit for researchers and clinicians addressing transdiagnostic problems affecting youth.

Youth Aggression and Peer Victimization as Predictors of Adolescent Alcohol and Marijuana Use: A Longitudinal Analysis of Youth with Aggressive Behavior Problems.

Youth who are behaviorally aggressive and victimized by their peers comprise a significant population with specific risks and vulnerabilities relative to substance use. The goals of the current study were to examine the roles that youth aggression and peer victimization play in determining the timing of alcohol and marijuana use initiation and the frequency of use 5-years later in a sample of at-risk, aggressive youth. 360 youth (Mage= 10.17 years; 65% boys, 35% girls; 78.1% African American, 20.3% Caucasian, 1.4% Hispanic, and 0.3% other) recruited for a prevention program for at-risk youth were followed for 5 years (4th - 9th grade). Cox PH regressions were conducted to predict timing of alcohol and marijuana use initiation. Zero-inflated negative binomial regressions were used to predict frequency of alcohol and marijuana use 5 years later. Results showed that peer victimization inferred decreased risk of alcohol use initiation. However, this effect was only observed for youth with relatively moderate, and low levels of aggression. Findings suggest that differences in youth aggression and victimization interact to predict distinct outcomes, suggesting the need for a more comprehensive approach when working with aggressive youth who have experienced peer victimization.

A Prospective Study of Co-Rumination in Parent-Adolescent Conversations Several Years After a Devastating Tornado

ABSTRACT Objective This study examined the association between youth post-disaster stress responses and co-rumination in conversations with a parent several years after a devastating tornado. Method Adolescents (N = 200) drawn from an ongoing study for aggressive youth (ages 13 to 17; 80% African American) and their parents experienced an EF-4 tornado in 2011 and then provided joint recollections about their tornado experiences approximately 5 years later. Recollections were coded for the four components of co-rumination: rehashing problems, dwelling on negative affect, mutual encouragement of problem talk, and speculating about problems. Parent-rated post-traumatic stress symptoms (PTSS) and youth resting respiratory sinus arrhythmia (RSA) were measured approximately 6-months and 1-year post-tornado, respectively. Results Results indicated that co-rumination could be identified, and reliably measured, in the tornado conversations. Resting RSA moderated the association between post-disaster PTSS and the co-rumination component dwelling on negative affect, such that youth PTSS was associated with higher levels of dwelling on negative affect but only at lower levels of resting RSA (an index of physiological dysregulation). There was no association between youth PTSS and dwelling on negative affect at high resting RSA (an index of better physiological regulation). Youth PTSS and resting RSA were unrelated to the other three co-rumination components. No gender differences were found. Conclusions Results provide preliminary evidence establishing the co-rumination coding scheme in a sample of disaster-exposed parents and adolescents. Results also indicated that PTSS and resting RSA are important youth-level factors that relate to how parents and adolescents discuss their disaster experiences even years post-exposure.

Parent, Teacher, and Youth Reports on Measures of Reactive and Proactive Aggression.

More research is needed to improve measurement selection and to better understand informant differences in reports of reactive and proactive aggression. Toward this goal, the current study evaluated the psychometrics (i.e., reliability, factor structure, and validity) and correlates of two measures of reactive and proactive aggression (i.e., Dodge & Coie, in J Pers Soc Psychol 53:1146, 1987; Raine et al. in Aggress Behav 32:15-171, 2006) across three informants (i.e., parent, teacher, and youth). Parent, teacher and youth reports of measures were collected in a community recruited sample of 9-12 year-old youth (M = 10.44; 56% male). Both measures demonstrated adequate to good internal consistency by parent- and teacher-report, and borderline to adequate internal consistency by youth-report. Additionally, aggression subscales were correlated within and across measures and informants, and an appropriate 2-factor structure was identified for both measures across informants. Consistent with prior research, reactive aggression was more robustly associated with depression symptoms and effortful control than proactive aggression across measures, but there were some links with proactive aggression. Overall findings suggest that both measures are psychometrically appropriate to use with parents, teachers, and youth. However, there were distinctions between the two measures, and relying solely on youth reports in this age group is not recommended. Further, there are unique associations evident with various informants, supporting the need for multiple informants when assessing functions of aggression in youth.

84.2 A Clinical Pathway for Evaluating and Managing Aggression in Youth With ASD in the Emergency Setting

84.2 A Clinical Pathway for Evaluating and Managing Aggression in Youth With ASD in the Emergency Setting

The effect of Instagram posts` Cyberbullying on Passive aggression of Egyptian youth: Social Learning Theory

The effect of Instagram posts` Cyberbullying on Passive aggression of Egyptian youth: Social Learning Theory

Associations of age, anxiety, cognitive functioning, and social impairment with aggression in youth with autism

BackgroundPrevious research has indicated that aggression in children with autism is associated with cognitive functioning, age, anxiety, and social functioning, although most samples only include parent-report measures and participants without intellectual disability. Furthermore, there is a lack of research investigating how different aspects of social impairment are associated with aggressive behaviour in youth with autism while anxiety is included in the analyses. The aim of this study was to clarify the relationships of these variables with aggression in a large sample, diverse in age and cognitive level, using both parent- and teacher-report measures. MethodParticipants were 1179 youth (age 4–18) with a diagnosis of autism spectrum disorder, from the SFARI database. Parent- and teacher-report measures were obtained for aggression, anxiety, and social impairment. Univariate statistics were calculated to determine how each variable was associated with aggression and hierarchical regressions were conducted with all variables together. ResultsAge and intellectual disability presence/severity had small positive relationships with teacher-measured aggression while anxiety and social impairment severity had strong relationships with aggression when rated by both parents and teachers. In a regression analysis, anxiety and social communication problems had the strongest positive relationships with aggression while social motivation problems had a negative relationship with aggression. ConclusionThese results indicate the importance of anxiety and social problems, particularly in social communication and motivation, when studying and treating aggression in youth with autism.

Parenting styles contributes to overt aggression, but age and gender matters

BackgroundEvidence from Euro-American and Eastern cultures suggest that parenting practices are linked to diverse problems, including aggression in youths. Findings from the sub-Saharan region rarely contribute to this debate. MethodWe examined the contributions of Baumrind's parenting style typology to overt aggression among Nigerian adolescents. Adolescents (n=261) completed measures of parenting styles and overt aggression. ResultsResults revealed that males were more overtly aggressive compared to females. Parenting styles were weakly related to overt aggression in adolescents. Girls who received authoritative parenting styles were the only group noticed to have a decline in overt aggression especially as they grew older. Boys who received authoritative parenting as well as boys and girls who received both authoritarian and permissive parenting reported sustained heightened levels of overt aggression even as they grew older. ConclusionParenting outcomes differ between gender and that authoritative parenting training could help reduce overt aggression among adolescent girls.

Relationship among Aggression, Non-Suicidal Self-Injury, and Depression in Youths.

Competition among countries becomes fiercer with progress in globalization. As the future and hope of national development, the youth are undertaking intensifying competitive pressures. More youths suffer psychological health issues, such as non-suicidal self-injury (NSSI), depression, and aggressive behaviors. What are the relationships among suicidal self-injury, aggression, and depression? There's few systematic study on these two aspects yet. Thus, we examined the relationship between aggression and NSSI in youths, as well as the mediating effects of depression in such a relationship. A total of 770 youths (comprising university students, community youths and rural migrant workers) in Zhejiang, Anhui and Henan in China were investigated from August to December 2022 by using the aggression scale, NSSI scale, and depression scale. The relationship among aggression, NSSI and depression in youths was discussed through a t-test, correlation analysis, and multivariate regression analysis. With respect to abuse experiences during childhood, parental emotional status and family conditions, the total scores in aggression, NSSI, and depression of youths differed significantly (P<0.05). A significantly positive correlation existed between aggression and NSSI of youths (r=0.41, P<0.01), a significantly positive correlation existed between aggression and depression (r=0.42, P<0.01), and a significantly positive correlation exists between NSSI and depression (r=0.42, P<0.01). Aggression of youths had not only direct and positive prediction effects on NSSI (B=0.41, P<0.001) but also indirect effects on NSSI through depression. Aggression, NSSI and depression of youths were influenced significantly by abuse experiences during childhood, parental emotional status and family conditions. Depression has partial mediating effects between aggression and NSSI in youths.

DESIGN OF GROUP COUNSELING INTERVENTION WITH RATIONAL EMOTIVE BEHAVIOR THERAPY (REBT) TECHNIQUES TO REDUCE STUDENT'S AGRESSIVE BEHAVIOR

Behavior aggressive in teenagers is phenomenon that requires attention quick for handled so as not give bad impact good for individual nor other people. Study this have destination for make design intervention counseling group with REBT (Rational Emotive Behavior Therapy) technique in reduce behavior aggressive. Study this use method studies literature with display results study appropriate past _ with variable discussion. Study results literature this explain two points related: 1) method counseling group with REBT technique in handle behavior aggressive youth, and (2) design intervention counseling group with REBT technique.

'Prosociality' in Daily School Life and Early Adolescents' Peer Aggression: A Multilevel Latent Profile Analysis Approach.

We aimed to typify prosocial characteristics of aggressive youth. We classified early adolescents based on daily configurations of prosocial behavior and autonomous prosocial motivations (performing prosocial behavior for identified and intrinsic reasons) and controlled prosocial motivations (performing prosocial behavior for external and introjected reasons) and explored the links between the obtained sub-groups and peer aggression. The sample included 242 Israeli six-graders [Mage = 11.96 (SD = 0.18), 50% girls] and their teachers. At the daily level, adolescents self-reported on prosocial behaviors and their autonomous and controlled prosocial motivations for ten consecutive days. At the trait level, adolescents reported on global, reactive, and proactive peer aggression. Teachers reported on adolescents' global peer aggression. Using multilevel latent profile analysis, we identified four day-level profiles of prosociality: 'high prosocial autonomous' (39% of days), 'low prosocial' (35%), 'average prosocial controlled' (14%), and 'high prosocial bi-motivation' (13%). At the adolescent level, we identified four sub-groups, each characterized by one dominant daily profile: 'stable high autonomy' (33% of adolescents); 'stable high bi-motivation' (12%); 'often average controlled' (16%); 'often low' (39%). Higher self-reported aggressive adolescents, particularly proactive aggressive, had the least chance of being in the 'stable high autonomy' sub-group of all sub-groups. Teacher-reported aggressive adolescents had the least likelihood of being in the 'stable high autonomy' sub-group and the most likelihood of being in the 'often low' sub-group. In sum, peer aggression is a function of the configured phenomenology of prosocial behavior and motivations, with high prosocial autonomously motivated youth being the least aggressive.