BACKGROUND: Preschool represents the budding and initial stage of bullying behavior, where perpetration of physical bullying predominates as the primary form of bullying. An in-depth understanding of the factors linked to preschool physical bullying behavior is crucial for enabling early prevention and intervention strategies.
OBJECTIVE: The purpose of this study was to examine the relationship between Theory of Mind and physical bullying behavior in 4-6 years old children in kindergarten and the mediating role of peer rejection and gender in this relationship.
METHODS: Data on perpetration of physical bullying and peer rejection were obtained from 310 preschool children (age range = 52-79 months, M = 66.85, SD = 7.04) by the peer nomination method, and their Theory of Mind was measured by the Theory of Mind Development Scale.
RESULTS: The results showed that Theory of Mind negatively predicted perpetration of physical bullying in preschool children and that Theory of Mind was related to perpetration of physical bullying in preschool children only through peer rejection. Boys were also found to have a stronger association between peer rejection and perpetration of physical bullying in preschool children than girls.
CONCLUSIONS: Peer rejection may play a mediating role between Theory of Mind and perpetration of physical bullying in preschool children. In addition, the relationship between peer rejection and perpetration of physical bullying appears to be stronger for boys than for girls. This contributes to our understanding of the relationship between Theory of Mind and perpetration of physical bullying in preschool children and has implications for how bullying prevention and intervention can be tailored to the gender of young children.

In the early years of schooling, peer groups are key to fostering students\' overall learning and development. Yet it has been found that around 10% of children suffer from peer rejection in the classroom, with this problem entailing negative consequences both in the short and long term. The problem proves difficult for adults to detect, which usually leads to a delay in measures being taken to intervene and prevent it. This study applies an experimental design with pre-test and post-test measurements in two groups-experimental and control-in order to address the problem of rejection in the early years of schooling. It explores aspects such as sociometric type, degree of victimisation, social and antisocial behaviour, as well as problematic situations among 637 students at six schools. We then implement an intervention programme for socioemotional competence throughout a school year in an effort to improve students\' social skills and relationships, focusing specifically on preventing and reducing the rejection experienced by some of these children. The programme comprises 35 teaching activities and strategies that promote the development of competences for student inclusion (curbing aggression, encouraging teamwork, fostering self-esteem, etc.) and that seek to involve all students, teachers, and relatives by offering an array of complementary resources that enrich the initiatives applied (a programme calendar, assessment notebook, questionnaires, related website, material resources). After the intervention programme, it was found that the experimental group had reduced the percentage of students who suffered rejection from 9.9% to 7.3%, although the same was not true of the control group, which went from 9.5% of rejected students to 10.2%. The reduction in the percentage of rejected students in the experimental group after the application of the programme is an encouraging result that invites us to continue working on more comprehensive interventions to prevent and reduce this phenomenon.

Facing a stressful environment of peer rejection and discrimination, Chinese migrant adolescents are at high risk of developing behavior problems while receiving insufficient family support. In this context, the current study aimed to explore the pathway from peer rejection to adolescent behavior problems via the mediating role of delinquent peer affiliation and with the moderating roles of parental company and parental monitoring taken into consideration. A sample of 2041 migrant adolescents (46.2% female, mean age = 13.595) was drawn from the first and second waves of the China Education Panel Survey (CEPS) for running a moderated mediation model. The results demonstrated that peer rejection positively predicted behavior problems through the mediator of delinquent peer affiliation (indirect effect = 0.007, 95% CI = [0.003, 0.014]). This mediating mechanism was moderated by parental company and by parental monitoring. Our study deepened the theoretical understanding and application of the general strain theory by showing how the interaction of peer stressors and parenting elements affected the behavior of migrant adolescents in a Chinese context. Further studies could pay more attention to the dynamic interplay between the family and peer systems, especially for rejected and marginalized adolescent groups. Limitations and implications for future school-based and family-based practices are also discussed.

The goal of the current study was to examine trajectories of relational and physical aggression in early childhood and evaluate peer predictors of these trajectories (i.e., peer rejection, relational victimization, and physical victimization). The study spanned three-time points (T1 in the spring, T2 in the fall, and T3 in the spring) in early childhood (N = 300; 44.0% girls; Mage  = 44.70 months, SD = 4.38; 3.0% African American/Black, 7.6% Asian/Asian American/Pacific Islander, 1.0% Hispanic/Latinx, 11.3% multiracial, 62.1% White, and 15.0% missing/unknown). Observations of peer victimization and teacher report of peer rejection were collected at T1, and teacher report of aggression was collected at all time points. Results from piecewise latent growth models demonstrated that both forms of aggression decreased from T1 to T2 as children entered a new classroom and increased from T2 to T3 as they remained in that classroom. The increase in physical aggression from T2 to T3 was only significant for boys. Peer rejection at T1 emerged as a predictor of both intercepts and slopes from T1 to T2, and physical victimization predicted the physical aggression intercept and physical aggression slope from T1 to T2. Children high on these peer risk variables had higher initial levels of aggression, followed by a greater decrease in aggression from T1 to T2. Results underscore the importance of studying incremental change in aggression in early childhood and suggest that children who experience negative peer treatment have greater fluctuations in aggression over time.

Detrimental effects of early life stress on cardiovascular health are evident in adolescence. Cardiovascular reactivity and recovery in response to interpersonal stress may be a mechanism. This study aimed to evaluate if adolescent girls with higher early life stress demonstrated greater cardiovascular reactivity and slower recovery to peer rejection. A sample of 92 adolescent girls (age: M = 13.24) self-reported early life stressors. Systolic blood pressure (SBP), diastolic blood pressure (DBP), and heart rate (HR) were continuously measured before, during, and after a laboratory peer rejection paradigm. Counter to hypotheses, adolescent girls with higher early life stress had lower, not higher, HR during the recovery period. Early life stress was not associated with SBP or DBP recovery. Additionally, early life stress was not associated with SBP, DBP, or HR reactivity. Future research is needed to assess if blunted cardiovascular reactivity to interpersonal rejection during adolescence is a mechanism linking early life stress and later cardiovascular disease risk in women.

Substance use escalates between adolescence and young adulthood, and most experimentation occurs among peers. To understand underlying mechanisms, research has focused on neural response during relevant psychological processes. Functional magnetic resonance imaging (fMRI) research provides a wealth of information about brain activity when processing monetary rewards; however, most studies have used tasks devoid of social stimuli. Given that adolescent neurodevelopment is sculpted by the push-and-pull of peers and emotions, identifying neural substrates is important for intervention. We systematically reviewed 28 fMRI studies examining substance use and neural responses to stimuli including social reward, emotional faces, social influence, and social stressors. We found substance use was positively associated with social-reward activity (e.g., in the ventral striatum), and negatively with social-stress activity (e.g., in the amygdala). For emotion, findings were mixed with more use linked to heightened response (e.g., in amygdala), but also with decreased response (e.g., in insula). For social influence, evidence supported both positive (e.g., cannabis and nucleus accumbens during conformity) and negative (e.g., polydrug and ventromedial PFC during peers\' choices) relations between activity and use. Based on the literature, we offer recommendations for future research on the neural processing of social information to better identify risks for substance use.

The experience of peer rejection in the classroom, an environment in which students spend a large part of their time, is accompanied by a sense of social pain which can have a profound effect on self-perception and attitude toward the overall school environment. These attitudes can be subsequently reflected in the student\'s behavior at school and in his/her school success. The research aims to identify differences in the perception of school life (interpersonal and intrapersonal) among rejected and popular upper-primary school students. For this purpose, the sociometric nomination method and a questionnaire measuring the student\'s perception of the school environment were used. From a total of 1,625 students (aged 11-15) from 20 schools, 312 students with the status of popular (liked) and rejected (disliked) were included in the research. The multivariate analysis of covariance (with age and gender as covariates) results revealed no significant differences between the two contrasting groups (popular and rejected) in terms of the perception of school life (interpersonal and intrapersonal). The results of the research indicated a different perception of the school environment within the groups of rejected and popular students rather than differences between the groups. Both the rejected and popular students report contradictory attitudes toward school life. Half of the students indicated that they feel lonely at school and have no confidence in teachers, considering the school a place where they do not like to learn, where they are troubled and where they do not like to talk to their classmates. Perhaps counterintuitively, a larger number of popular students stated that they feel lonely than did the rejected students from the class. Although the results do not paint a very positive picture of perceptions of the school environment, this should be seen as an opportunity to develop active class work with a greater emphasis on strengthening collective trust in the school.

Peer rejection powerfully predicts adolescent anxiety. While cognitive differences influence anxious responses to social feedback, little is known about neural contributions. Twelve anxious and 12 age-, gender- and IQ-matched, psychiatrically-healthy adolescents received \'not interested\' and \'interested\' feedback from unknown peers during a Chatroom task administered in a neuroimaging scanner. No group differences emerged in subjective ratings to peer feedback, but all participants reported more negative emotion at being rejected (than accepted) by peers to whom they had assigned high desirability ratings. Further highlighting the salience of such feedback, all adolescents, independent of anxiety levels, manifested elevated responses in the amygdala-hippocampal complex bilaterally, during the anticipation of feedback. However, anxious adolescents differed from healthy adolescents in their patterns of persistent amygdala-hippocampal activation following rejection. These data carry interesting implications for using neuroimaging data to inform psychotherapeutic approaches to social anxiety.

BACKGROUND: Children with autism have difficulties in understanding relationships, yet little is known about the levels of autistic traits with regard to peer relationships. This study examined the association between autistic traits and peer relationships. Additionally, we examined whether the expected negative association is more pronounced in children with a lower non-verbal IQ and in those who exhibit more externalizing problems.
METHODS: Data were collected in a large prospective birth cohort of the Generation R Study (Rotterdam, the Netherlands) for which nearly 10,000 pregnant mothers were recruited between 2002 and 2006. Follow up data collection is still currently ongoing. Information on peer relationships was collected with PEERS application, an interactive computerized task (M = 7.8 years). Autistic traits were assessed among general primary school children by using the Social Responsiveness Scale (M = 6.1 years). Information was available for 1580 children.
RESULTS: Higher levels of autistic traits predicted lower peer acceptance and higher peer rejection. The interaction of autistic traits with externalizing problems (but not with non-verbal IQ or sex) was significant: only among children with low externalizing problems, a higher level of autistic traits predicted less peer acceptance and more peer rejection. Among children exhibiting high externalizing problems, a poor peer acceptance and high level of rejection is seen independently of the level of autistic traits.
CONCLUSIONS: We conclude that autistic traits-including traits that do not classify as severe enough for a clinical diagnosis-as well as externalizing problems negatively impact young children\'s peer relationships. This suggests that children with these traits may benefit from careful monitoring and interventions focused at improving peer relationships.

Although childhood aggression is typically associated with peer rejection, some children concurrently employ coercive and socially skilled behavior and successfully avoid negative peer outcomes. However, research on children\'s dual use of coercive and social behavior has largely employed cross-sectional designs with nonclinical populations and, as a result, little is known about the covariation of aggression with social skills, particularly among high-risk samples. We directly addressed this limitation by testing childhood aggression and social skills as separate time-varying predictors of prospective change in peer rejection in a sample of children with and without attention-deficit/hyperactivity disorder (ADHD). Two hundred and two 5-10-year-old children (M = 7.9 years, SD = 1.2) with and without ADHD were followed prospectively for 6 years. Key constructs, including children\'s overt aggression, social skills, and peer rejection, were collected at each of the three waves using multiple methods and informants. Controlling for demographic factors and time-varying ADHD symptoms, longitudinal change in child-, parent-, and teacher-reported aggression positively predicted prospective change in parent- and teacher-reported peer rejection. Importantly, predictions were moderated by parent- and teacher-reported social skills, such that aggression inversely predicted peer rejection for children with high social skills. These results demonstrate that social skills meaningfully alter trajectories of peer rejection predicted from cross-time variation in aggression. We discuss the theoretical and empirical implications of these findings within a developmental psychopathology framework, including recommendations for directions for future research.