The present study was designed with the purpose of contributing to the existing scientific literature about the presence of Dark Tetrad personality traits--Machiavellianism, psychopathy, narcissism, and sadism--in aggressors and victims of school bullying, also taking into account the possible gender differences in both roles. The results,…

Introduction: Suicide in adolescents poses a major public health crisis as the second leading cause of death in youth. Suicidal thoughts and behaviors (STBs) are a principal reason for psychiatric hospitalization among adolescents. Numerous studies across development have identified risk factors (e.g., depression, borderline personality (BPD)…

This study explores the associations among narcissistic traits, emotion regulation strategies, and peer problems among adolescents. Specifically, it examines whether cognitive reappraisal and expressive suppression moderate the relationship between narcissistic traits and peer problems. In total 2207 individuals (1165, 52.8% females), aged between…

We examined how bullying victimization across childhood and adolescence was associated with BPD symptoms in emerging adulthood. Participants were drawn from the McMaster Teen Study, representing a community sample. A three-class solution of bullying victimization trajectories was selected from a semi-parametric group-based trajectory analysis…

Perfectionism is a multidimensional personality trait with two higher-order dimensions; perfectionistic strivings and perfectionistic concerns. The purpose of the present study was to explore and evaluate the two-factor model for the first time using three instruments developed to measure perfectionism in sport. In doing so, we (i) assessed the…

Children who show elevated levels of indirect aggression (IA) from childhood to adolescence are at increased risks of experiencing detrimental outcomes. Some studies suggest that psychopathic traits could act as a predisposing vulnerability in the development of IA, but the contributions of all three dimensions of psychopathic traits in explaining…

Ostracism and dark triad personality traits have been found to be linked with social media addiction. Despite the well-established relationship between the dark triad (i.e., narcissism, machiavellianism, and psychopathy) and social media addiction, there is limited research on their mediating effect. In the present study, we tested a hypothetical…

A family systems framework guided our investigation of self-injurious behavior (SIB) in adolescents. As part of a larger study, we collected data examining SIB and family functioning from 29 adolescents (M[subscript age] = 15.66) and their caregivers. These adolescents with traits of borderline personality disorder were seeking counseling from…

Research on adults indicates other-oriented perfectionism (requiring perfection from others) is associated with various consequential outcomes independent of self-oriented perfectionism (requiring perfection of the self) and socially prescribed perfectionism (believing others require perfection of the self). However, historically, the most widely…

Recent studies have consistently demonstrated that antisocial behaviors occur in online environments. Although online antisocial behavior has a long history, it appears to have become more widespread in recent years due to the widespread use of online social networks. Although there are established criteria and instruments assessing antisocial…

Youth with greater levels of narcissism face a wide array of difficulties in interactions with others. However, there exists a curious lack of research on their close relationships, such as friendships. In this study, we examined associations between narcissism and friendship features over time. Participants were 261 eighth and ninth graders (112…

Objective: In this review, we examined if there is a deficit in facial recognition of emotion (FER) in children, adolescents, and adults with attention deficit hyperactivity disorder (ADHD). Background: Emotional regulation is impaired in ADHD. Although a facial emotion recognition deficit has been described in this condition, the underlying…

Borderline personality disorder is a severe disorder with distinct features which might be early identified in adolescence. Adverse experiences in childhood have been established as a risk factor for developing borderline features, and self-compassion has been proposed as a protective factor. This study aimed to test the mediation role of the…

Indirect aggression has been associated with antisocial personality traits like Machiavellianism, but there is a lack of evidence on their longitudinal development across adolescence. Therefore, the joint developmental trajectories of adolescent indirect aggression and Machiavellianism across 3 years of high school (Grades 10 to 12) were…

Background: Borderline personality symptoms include emotional dysregulation, high levels of impulsivity leading to self-harm and suicidality, an unstable sense of self, fears of abandonment, extremely turbulent relationships, and psychic pain. They are considered to disrupt normative adolescent development however their unique contribution to…