In this longitudinal study, we investigated the factor structure and stability of early-life temperament in a German sample, using three measures developed within Rothbart's psychobiological approach. Temperament was measured using the Infant Behavior Questionnaire Revised (IBQ-R) at the ages of 6 and 12 months, the Early Childhood Behavior…

The directionality and longitudinal course between perfectionism and academic achievement throughout adolescence remains unclear as most studies rely on cross-sectional or short-term data and many examine these associations in university students who do not represent the full spectrum of learners. Moreover, most studies are hampered by their…

The objective of this study was to examine the relation between personality traits and prosocial lie-telling in children. A sample of 187 children aged 8-12 years (M[subscript age] = 9.74 years, SD[subscript age] = 1.01) was recruited from elementary schools in the south of France. The children's prosocial lies were measured using the Helping…

This study examined whether individual differences in personality (development) from adolescence to emerging adulthood were associated with burnout and happiness in emerging adulthood. At Time 1 (2009; M[subscript age] = 15.7 years), Time 2 (2012), and Time 3 (2015), Belgian participants (N = 329; 43.1% boys) reported on the personality dimensions…

Individuals feel lonely when they perceive a discrepancy between their desired and their actually experienced quantity and quality of social relationships. Prior research has demonstrated the importance of loneliness for various health-related aspects. In the present article, we extend the existing literature on loneliness by investigating its…

Research to date has shown longitudinal changes in conscientiousness during early and middle adolescence, but most studies have been conducted in Western countries. The present study aimed to examine the pattern of mean-level conscientiousness change at the transition into early adolescence among a Chinese sample using curve of factors (CUFFS)…

The present study provided a novel examination of how children's theory of mind (ToM) might be related to two maternal beliefs: (1) social dominance orientation (SDO: the belief that inequalities in society are justified) and (2) right-wing authoritarianism (RWA: a belief in following established authorities). We reasoned that these beliefs could…

Background: Although plausible links between language development and personality have been suggested, longitudinal studies of these associations into adulthood have not been conducted. Aim: To investigate whether children's age at attaining language milestones is associated with later adult personality. Methods: Mothers' of 8,400 children from…

Across all cultures, parents have intuitive ideas ("ethnotheories") of what undesirable child characteristics are as well as how to explain them. Yet there have been relatively few cross-cultural comparisons of parents' ethnotheories about the nature and causes of child misbehavior. 108 mothers of 5-year-old children from the United…

Callous-unemotional (CU) traits predict behavioral problems in adolescence. But little is known about early modulatory factors. Behavioral Inhibition (BI) in particular has been suggested to protect against the development of CU-traits. This temperamental predisposition is characterized by heightened environmental sensitivity. The current…

An emerging literature suggests that females are more likely than males to take and post selfies and that such selfies tend to both conform to and legitimize the sexualization of femininity. It has been found that key predictors of selfie behaviors are narcissistic personality traits and that taking a higher number of selfies may, in turn, put…

Despite the robust link between dispositional optimism and well-being across the lifespan, the developmental origins of dispositional optimism are unknown. Understanding the pathways that lead to greater optimism during the transition from adolescence into young adulthood may be important given that this stage of the life course involves the…

The present study used quantitative and qualitative methods to explore how lonely young people are seen from others' perspectives, in terms of their personality, behavior, and life circumstances. Data were drawn from the Environmental Risk Longitudinal Twin Study, a cohort of 2,232 individuals born in the U.K. in the mid-1990s. When participants…

Narcissistic youth use social media to engage in a variety of self-promotional behaviors, which have either antisocial or prosocial characteristics. Differing views exist to explain the processes underlying narcissistic self-promotion, either characterizing these actions as intentional, or as impulsive. This study compared intentional…

The study aimed to find out which differences and similarities emerge in the self-concepts of early and late adolescents and young, middle-aged, and older adults. A total of 822 participants, including 530 adolescents aged 9-19 (over 50% were girls) and 292 adults aged 20-71 (over 80% were women), from Estonia provided their spontaneous…