Theo Klimstra

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• PhD
• Senior Lecturer at Tufts University

Identity research largely emerged from clinical observations. Decades of empirical work advanced the field in refining existing approaches and adding new approaches. Furthermore, the existence of linkages of identity with psychopathology is now well established. Unfortunately, both the directionality of effects between identity aspects and psychopa...

Overviews on research on personal identity tend to be overly focused on research in North America and West Europe. In this chapter, we argue for a more cosmopolitan approach to identity. We first outline major conceptualizations of identity and etic (cross-cultural) applications of these models outside of the Western world. Next, we discuss specifi...

Identity development-exploring options and making commitments-is an important process related to human functioning across the lifespan. An accurate understanding of identity development processes requires precise measures, but commonly used questionnaires have not been subject to intensive psychometric analyses. We investigated the psychometric pro...

In this paper, we argue that who one is and wants to become is closely related to whom one admires. Although the links between identity formation and exemplars have been largely neglected, we claim that integrating both literature studies provides interesting new insights. First, exemplars can play an important role in and constitute a powerful too...

A vast body of knowledge on development and correlates of personality dimensions has led to recommendations on policy implications and interventions. However, we argue that there has not been enough attention to the socio-cultural contexts of personality development, resulting in incomplete and potentially harmful interpretations of the data. Altho...

Longitudinal data are necessary for the study of young adult development, but researchers face many options with respect to designs. This chapter focuses on longitudinal mixed-methods designs, which refer to research that integrates qualitative and quantitative data analyses. The first section describes why researchers should consider mixed-method...

A rich theoretical and empirical literature captures experiences of identity conflict and tension at the nexus of identity domains that feel incompatible. The Identity Negotiation Experiences and Strategies (INES) scale was developed to provide a quantitative tool for capturing experiences of identity strain or conflict, and strategies for respondi...

Identity research focuses on multiple processes capturing how adolescents form and maintain a sense of self. However, identity content (the “what” of identity) might impact associations between identity and the association with well-being. We examined this potential role of content (i.e., valence and life domain) in two studies, focusing on autobio...

Identity distinctiveness, continuity, and coherence are all components of adolescents’ identity development, but their longitudinal relations have rarely been examined. Data were analyzed on these three constructs collected over three years from 349 Dutch adolescents (Mage = 14.7, SDage = 0.7, 215 [61.6%] girls and 133 [38.1%] boys). A cross-lagged...

Adolescence is a period where personality difficulties can start emerging. At the same time, a great deal of development in narrative identity takes place. Given that identity impairments are a key feature in personality pathology, it is useful to understand how pathological traits and narrative identity features are related. The current study addr...

The transition out of university education and into the workforce represents a turning point in terms of the evolution of one's goals, roles, responsibilities, relationships, and lifestyle. For this reason, this transition might create important challenges and opportunities for identity formation. The present mixed-method longitudinal study examine...

Positive peer and romantic relationships are crucial for adolescents' positive adjustment and relationships with parents lay the foundation for these relationships. This longitudinal meta-analysis examined how parent-adolescent relationships continue into later peer and romantic relationships. Included longitudinal studies (k = 54 involving peer re...

This is a commentary to "Ten Steps Toward a Better Personality Science: How Quality may be Rewarded More in Research Evaluation" (Leising et al., 2022). It is published in the open access journal Personality Science.

Positive peer and romantic relationships are crucial for adolescents’ positive adjustment and relationships with parents lay the foundation for these relationships. This longitudinal meta-analysis examined how supportive and negative parent-adolescent relationships continue into later peer and romantic relationships. Multilevel meta-regressions bas...

Resilience is a key construct in psychology, which describes the maintenance of comparatively good mental health despite of environmental adversities or successful recovery from such adversities. Furthermore, it labels a specific personality type, characterized by high levels across the Big Five. However, whether the resilient type predicts less un...

In this chapter, we critically discuss contemporary approaches to infer identity statuses. We will focus on how identity statuses can be delineated through a person-centered approach (e.g., cluster analysis and latent class/profile analysis [LCA/LPA]). These methods can depict how multiple variables are configured within persons, capturing identity...

Since the early 2000s, researchers have been taking advantage of the increasing availability of internet-based technology to gather intensive longitudinal data over short-term (e.g., hours, days) time intervals. However, phenomena that are relevant at long-term (e.g., months, years) time intervals may manifest themselves differently at different ti...

Traditional personality disorder (PD) taxonomies have been developed for adult populations. We aimed to identify an adolescent hierarchical tree typology of PD indicators to provide classification into broad severity classes but also more fine-grained classification within those classes. A large sample of community adolescents (N = 1,940) completed...

Introduction Experiences during the last years of college could stimulate identity formation processes within and across the domains of future plans and education. In the present study, the first research question addressed how identity formation dimensions for education and future plans were associated with each other during the last years in educ...

Increasing immigration around the world has affected the lives of children and adolescents. The ability to cope with the stress of migration and adaptation to a new culture likely is an important protective factor for optimal identity development under these conditions. The present study examined the role of coping strategies in interpersonal ident...

Stressful events are associated with various outcomes, but there is variability in these associations suggesting that the interpretation of these events is important. This interpretation is reflected in the narratives adolescents tell of events, which are largely constructed in social interactions. We examined the associations of perceived friendsh...

Stressful events are associated with various outcomes, but there is variability in these associations suggesting that the interpretation of these events is important. This interpretation is reflected in the narratives adolescents tell of events, which are largely constructed in social interactions. We examined the associations of perceived friendsh...

Grounded in the family stress model and recent studies on cognitive effects of poverty, the current study examines how family material conditions relate to identity-relevant information processing among adolescents via family economic strain, family financial conflicts, and parenting behaviors. Data for the study come from the first wave of a longi...

Identity development has been linked to substance use, but the directionality of this relationship remains unclear. We examined the longitudinal associations of educational and relational identity with substance use across three annual waves in 360 Dutch adolescents (M age = 13.7 years). We found three latent profiles using the identity dimensions...

Identity development has been linked to substance use, however, the directionality of this relationship remains unclear. We examined the longitudinal associations of educational and relational identity with substance use across three annual waves in 360 Dutch adolescents (Mage = 13.7 years). Using the identity dimensions of commitment, exploration,...

Identity development has been linked to substance use, however, the directionality of this relationship remains unclear. We examined the longitudinal associations of educational and relational identity with substance use across three annual waves in 360 Dutch adolescents (Mean age = 13.7 years). Using the identity dimensions of commitment, explorat...

Narrative identity is likely to be important in the development of personality disorder (PD) in adolescence. Adolescents’ life narratives provide rich material that is near to their lived experiences and reveal individual differences in self and relatedness and in ways of constructing meaning. Narrative identity is linked with well-being and psycho...

Adolescents with schizotypal personality disorder (STPD) features such as odd thinking and bizarre fantasies may have difficulty developing effective life narratives. Their autobiographical memories likely will include aberrant, stressful experiences that are difficult to integrate into a cohesive, healthy sense of self. Moreover, these adolescents...

There is currently a lack of understanding of the structure of personality disorder (PD) trait facets. The network approach may be useful in providing additional insights, uncovering the unique association of each PD trait facet with every other facet. A unique feature of network analysis is centrality, which indicates the importance of the role a...

Adolescents with schizotypal personality disorder (STPD) features such as odd thinking and bizarre fantasies may have difficulty developing effective life narratives. Their autobiographical memories likely will include aberrant, stressful experiences that are difficult to integrate into a cohesive, healthy sense of self. Moreover, these adolescents...

The narrative and dual-cycle approach conceptualize and operationalize adolescents’ identity formation in different ways. While the narrative approach focuses on the construction of an autobiographical life story, the dual-cycle approach focuses on the formation of identity commitments. Although these approaches have different emphases, they are co...

Age and gender differences across the lifespan in dark personality features could provide hints regarding these features’ functions. We measured manipulation, callous affect, and egocentricity using the Dirty Dozen and their links with agreeableness in a pooled cross-sectional dataset (N = 4,292) and a longitudinal dataset (N = 325). Age trends for...

Becoming independent from parental financial support and developing financial capabilities are important life tasks in emerging adulthood (EA). However, research on how the accomplishment of these tasks contributes to perceptions of EA features is rare. This study investigates how functioning in the financial domain shapes perceptions of EA feature...

A dimensional perspective on personality pathology in which trait assessment plays an important role has been proposed in the DSM-5, as represented in the PID-5 measure. In an attempt to increase the feasibility of the personality disorder (PD) assessment process, Maples and colleagues constructed a reduced, 100-item version of the PID-5. This stud...

This 8-wave person-centered multi-informant study tested whether the quality of parent–adolescent relationships predicted the romantic experiences of young adults and their partners (N = 374; 54.8% girls; Mage = 13.08 years, SDage = 0.48 at the first measurement wave). Perceptions of parent–adolescent relationships were assessed using adolescent, m...

The narrative and dual-cycle approach conceptualize and operationalize adolescents’ identity formation in different ways. While the narrative approach focuses on the construction of an autobiographical life story, the dual-cycle approach focuses on the formation of identity commitments. Although these approaches have different emphases, they are co...

Studies on identity formation focus on various components of identity. However, these components have mainly been studied separately, and researchers in different fields are not always aware of each other’s work. Therefore, this systematic review provides an overview of theories and empirical studies on three key components of identity: distinctive...

The formation of a stable identity, consisting of a strong set of commitments, is a key developmental task in adolescence and young adulthood. Not resolving this task and lacking strong identity commitments is related to difficulties like depressive symptoms and stressful life events. However, the exact role of identity commitments in these negativ...

Individual distinctiveness is theorized to characterize an adaptive identity, but its importance remained underexplored. In two studies, we investigated the nomological networks of two common conceptualizations of distinctiveness: general and comparative distinctiveness. We compared these to the network of identity formation’s best-validated marker...

The social investment theory (SIT) proposes that personality maturation is triggered by transitions into age‐graded roles and psychological commitment to these roles. The present study examines the predictions of SIT by focusing on the transition from student life to working life. We analysed three‐wave longitudinal data and compared participants w...

Emotion dysregulation and hyperreactivity are considered central features of Borderline Personality Disorder (BPD). We assumed that such emotion dysregulation is also reflected in increased crying behavior of these patients and, consequently, hypothesized that BPD patients (N=62), compared to Cluster C personality disorder patients (Cluster C-PD; N...

Previous work has identified important correlational linkages between the dark triad of personality (Machiavellianism, psychopathy, and narcissism) and antisocial behavior in adolescence. However, little is known about the longitudinal associations between these personality characteristics and antisocial behavior, and the processes underlying these...

Background Adolescents face major developmental tasks such as increasing individuation and establishing autonomy. These developmental tasks increase demands on adolescent self-control, hereby putting youth with poor effortful control at risk for psychopathology. Specific parenting behaviors might be warranted to buffer against this risk. Objective...

Individual distinctiveness is theorized to characterize an adaptive identity, but its importance remained underexplored. In two studies, we investigated the nomological networks of two common conceptualizations of distinctiveness: general and comparative distinctiveness. We compared these to the network of identity formation’s best-validated marker...

According to Linehan (1993), emotion dysregulation is a central feature of borderline personality disorder (BPD). We hypothesized that patients with BPD are emotionally hyperresponsive. For BPD treatment, it is important to evaluate this hypothesis, because, if it is supported, therapeutic interventions could be designed to help patients to better...

Although studies have explored how cultural identity impacts young people’s daily lives, these studies have exclusively focused on daily variability in cultural identity salience, overlooking daily variability in the underlying developmental processes. In the present study, we used a 12-day daily assessment conducted with 873 Hispanic college stude...

The current study is among the first to examine rank-order stability and mean-level change across college in both broad Big Five personality trait domains (e.g., Neuroticism) and the narrower facets underlying these domains (i.e., self-reproach, anxiety, and depression). In addition, the current study tests longitudinal associations between Big Fiv...

Developmental changes in adolescents’ relationships with parents and friends intertwine, but individual differences in these relationships are likely to emerge as not all adolescents develop similarly. Generalized anxiety symptoms may underlie these individual differences, as these symptoms have frequently been associated with interpersonal difficu...

Two main reasons for dropping out of higher education are making an erroneous educational choice (an identity commitment) and lack of motivation. This study examined whether identity formation and motivation among prospective students at the moment of choosing a bachelor's program (N=8723) predicted their academic achievement in their first year. P...

Studies on identity formation focus on various components of identity. However, these components have mainly been studied separately, and researchers in different fields are not always aware of each other's work. Therefore, this systematic review provides an overview of theories and empirical studies on three key components of identity: distinctive...

In this chapter, we discuss identity formation during adolescence and young adulthood focusing on two prominent contemporary models. Both models are extensions of Marcia’s (1966) original model of identity formation, in which dimensions of commitment and exploration are split into three or five processes. We review research on general developmental...

The formation of a stable identity, consisting of a strong set of commitments, is a key developmental task in adolescence and young adulthood. Not resolving this task and lacking strong identity commitments is related to difficulties like depressive symptoms and stressful life events. However, the exact role of identity commitments in these negativ...

Identity formation is a key developmental task in adolescence. Although many adolescents in modern societies face issues of identity, there are substantial individual differences in identity exploration and commitment. Little is known about the origins of these individual differences. The current study investigated the genetic and environmental con...

The separation-individuation, evolutionary, maturational, and expectancy violation-realignment perspectives propose that the relationship between parents and adolescents deteriorate as adolescents become independent. This study examines the extent to which the development of adolescents’ perceived relationship with their parents is consistent with...

Objectives: The present study investigated deficiencies in different components of emotional intelligence in borderline personality disorder (BPD). Method: The Mayer-Salovey-Caruso Emotional Intelligence Test (MSCEIT) and the Emotional Quotient Inventory (EQ-i) were used to assess EI dimensions. BPD patients (N = 85; 69 women; M = 33.6 years) we...

The present study examined the role of person–group dissimilarity in personality in peer victimization. It was hypothesized that adolescents who show more deviation from the classroom norm in personality experience more peer victimization. Data from 1108 adolescents (48% boys; Mage = 13.56 years, SD = 1.13) from 54 classrooms were used to test this...

Early executive functioning is an important predictor for future development of children’s cognitive skills and behavioral outcomes. Parenting behavior has proven to be a key environmental determinant of child executive functioning. However, the association of parental affect and cognitions directed to the child with child executive functioning has...

Emerging adulthood theory highlights ambivalence about one’s adult status as a distinctive feature of this period. However, most studies that addressed this ambivalence employed rather limited, single-item measures, or measures that focused on specific life domains but addressed them separately. Although existing literature suggests that various li...

Important linkages between daily mood and identity formation have been theorized, but have not been empirically tested as of yet. The present study provided a first examination of these linkages within individuals (N = 392; 55.1% boys; Mage at T1 = 13.24, SD = 0.44) across 15 series of 5 days distributed over five years. Results revealed negative w...

In the present research, we examined associations between contextual and individual factors and adolescents’ conflict resolution with mothers. In Study 1, we explored links between maternal responsiveness and psychological control and adolescent conflict resolution styles (positive problem solving, conflict engagement, withdrawal, and compliance) w...

No previous studies examined longitudinal associations between personality facets and identity dimensions in early and middle adolescence. To uncover these relationships, we test the direction of effects of domain- and facet-level personality traits with identity dimensions in early and middle adolescence. For this purpose, we used two annual waves...

Person-centred approaches classify individuals with similar attributes in the same group and describe differences between these groups of individuals. However, these approaches are scarcely used, partly due to their low predictive power. This study aimed to overcome previous limitations using an adjusted person-centred procedure to identify a relia...

Identity formation is a lifelong task, yet much research focuses on adolescence and emerging adulthood. Little is known about whether parents' identities are related to their adolescent children's identities. The present studies were designed to examine intergenerational associations. Specifically, we focused on identity styles (Study 1 with 191 mo...

The purpose of this study was to examine the psychometric properties of the Utrecht-Management of Identity Commitments Scale (U-MICS), a self-report measure aimed at assessing identity processes of commitment, in-depth exploration, and reconsideration of commitment. We tested its factor structure in university students from a large array of cultura...

Accumulating evidence suggests that the Dark Triad of personality (i.e., Narcissism, Psychopathy, and Machiavellianism) is useful in explaining individual differences in adult adjustment. The present study is among the first to examine unique effects of these traits on multi-informant ratings of adolescent aggressive behavior. In two samples (Ns =...

Maes, M., Wang, J. M., Van den Noortgate, W., & Goossens, L. (2016). Loneliness and attitudes toward being alone in Belgian and Chinese Adolescents: Examining measurement invariance. Journal of Child and Family Studies, 25, 1408-1415. doi:10.1007/s10826-015-0336-y Maes, M., Klimstra, T., Van den Noortgate, W., & Goossens, L. (2015). Factor structur...

New frameworks for studying linkages between personality and psychopathology are needed. Yet, it is crucial to incorporate extant knowledge on both personality and psychopathology in such new models. In particular, we argue that a dimensional approach to psychopathology is preferred over a categorical approach based on arbitrary distinctions betwee...

Personality traits are hypothesized to be among the most important factors contributing to individual differences in identity development. However, longitudinal studies linking Big Five personality traits to contemporary identity models (in which multiple exploration and commitment processes are distinguished) are largely lacking. To gain more insi...

Benefits and disadvantages of solitude for adolescents are often highlighted. However, research focusing on adolescents’ attitudes towards solitude and their associations with such disadvantages or benefits is rather limited. The present study provides a personcentred perspective on the co-occurrence of two attitudes towards solitude (i.e., aversio...

The aim of this cross-national study was to assess the relationships among sense of community (SoC) vis-à-vis the residential community (i.e., one's home town), identity formation processes, and feelings of loneliness toward parents and peers. The sample included 431 Italian adolescents (59.4% females) and 221 Belgian (Flemish) adolescents (54.3% f...

Love and work constitute two life-defining identity domains for emerging adults. The present study utilized a five-dimensional identity model and examined identity configurations across these two domains, capturing the degree to which identity statuses correspond across domains. A sample of German 18–30-year-olds who were either working or studying...

Maes, M., Klimstra, T., Van den Noortgate, W., & Goossens, L. (2015). Factor structure and measurement invariance of a multidimensional loneliness scale: Comparisons across gender and age. Journal of Child and Family Studies, 24, 1829-1837. doi:10.1007/s10826-014-9986-4

This study focuses on the factor structure of a multidimensional loneliness measure, that is, the Loneliness and Aloneness Scale for Children and Adolescents (LACA). Confirmatory factor analyses were conducted on a large sample of children and adolescents (N = 9,676) in Belgium. Results indicated that the supposed four-factor structure of the instr...

The role of parenting (adolescent-perceived maternal solicitation of information and control), and child-driven processes (adolescent disclosure and secrecy) in parental knowledge of adolescents' activities, norm-breaking, and anxiety were examined among 498 poor Palestinian youth (M = 15 years) living in refugee camps in Jordan. With family relati...

Inspired by the common sense model, the present cross-sectional study examined illness perceptions and coping as intervening mechanisms in the relationship between Big Five personality traits and illness adaptation in adults with Type 1 diabetes. A total of 368 individuals with Type 1 diabetes (18-35 years old) completed questionnaires on personali...

The directionality of effects in the associations between personality and externalizing behavior (i.e., delinquency, soft drugs use, and alcohol abuse) is unclear. Moreover, previous studies only examined personality trait domains when examining these associations, whereas personality facets underlying these broad domains provide more specificity....

The internal consistency and construct validity of the RULS-8, a brief measure of loneliness for use with adolescents, was examined in three samples of Dutch-speaking adolescents in Belgium (for a total of N = 6,236). The measure showed high levels of internal consistency (ranging between .80 and .82), strong convergence with the original 20-item i...

The increasing popularity of Facebook among adolescents has stimulated research to investigate the relationship between Facebook use and loneliness, which is particularly prevalent in adolescence. The aim of the present study was to improve our understanding of the relationship between Facebook use and loneliness. Specifically, we examined how Face...

Correlated change between different personality traits has recently caught the attention of researchers studying personality development. We conducted two studies to examine age effects (Study 1) and effects of cognitive ability (Study 2) on this phenomenon. Results indicated that correlated change was relatively stable from adolescence through adu...

Within a dual-level model of personality, loneliness, and attitudes toward aloneness can be regarded as phase-specific adaptations that are influenced by personality traits. Therefore, we examined the associations between personality traits (i.e., the Big Five, sociotropy, and autonomy), loneliness, and attitudes toward aloneness in two samples of...

Adolescence and young adulthood are characterized by important changes in personality, changes toward a more stable identity, and the establishment of intimate relationships. We examined the role of personality traits in establishing intimate relationships, the interplay between personality traits and interpersonal identity processes during these r...

Adolescents at-risk for problem behaviors can have more difficulties in developing a firm sense of personal identity. Hence the purpose of this prospective longitudinal study was to scrutinize how externalizing problems in early adolescence impact identity development in middle to late adolescence. Participants were 443 (43.12 % female) Dutch adole...

During early adulthood, individuals from different cultures across the world tend to become more agreeable, more conscientious, and less neurotic. Two leading theories offer different explanations for these pervasive age trends: Five-factor theory proposes that personality maturation is largely determined by genetic factors, whereas social-investme...

Previous studies have found that perceived parental interpersonal interaction behaviors, such as rejection, overcontrol, and negative attachment behaviors, increase adolescent generalized anxiety disorder (GAD) symptoms. However, most of these studies have been cross-sectional, as opposed to longitudinal, and have examined these perceived parental...

Personal identity formation constitutes a crucial developmental task during the teens and 20s. Using a recently developed five-dimensional identity model, this cross-sectional study (N = 5834) investigated age trends from ages 14 to 30 for different commitment and exploration processes. As expected, results indicated that, despite some fluctuations...

Personality development is not only about changes in traits, but also about changes in other layers of the self, such as the identity layer. In adolescence, identity formation is thought to be the key developmental task, but profound changes in personality traits have also been found in this period. The present overview summarizes current direction...

Personality is among the most important factors contributing to individual differences in identity formation. However, previous studies mainly focused on broad personality domains and neglected more specific facets. In addition, it has only recently been recognized that identity formation is guided by multiple types of commitment and exploration. T...

Personal identity formation represents a core developmental challenge for adolescents and young adults. Because much of the identity literature focuses on college students, it is necessary to conduct a detailed inquiry into the ways in which specific commitment and exploration processes develop over time for college students and for employed indivi...