Genetic and environmental influences on personality trait stability and growth during the transition to adulthood: a three-wave longitudinal study

The Effects of Adverse Childhood Experiences (ACEs), Mental Illness, and Personality Differences on Attitudes Toward Self-Efficacy Among Females on Parole/Probation

Female offenders released from prison often face challenges within the community such as lack of employment, inconsistent attendance in substance use treatment, and complying with parole and probation conditions, which typically decreases their self-efficacy and motivation to refrain from reoffending. Despite this, much is still unknown of psychological factors that could impact female offenders' attitudes toward self-efficacy, such as mental illness symptoms, Adverse Childhood Experiences (ACEs), and personality differences. Thus, this cross-sectional study explored whether mental illness symptoms, ACEs, and personality differences were associated with attitudes toward self-efficacy (N = 398). Results suggest that mental illness symptoms, ACEs, and neuroticism negatively associated with attitudes toward self-efficacy in contrast to extraversion and conscientiousness. Parole/probation reentry and therapeutic implications are discussed.

A Fundamental Difference in the Nature of Personal Values and Personality Traits Revealed Through Different Patterns of Stability Across Their Distributions

OBJECTIVE

Personal values and personality traits are both important aspects of personality, but much is still unknown about the fundamental differences between the constructs, including how their patterns of temporal stability compare. This paper investigated patterns of intra-individual stability in both values and traits.

METHOD

Quantile correlations were estimated between each of the 20 refined personal values and the same values 2 years later in a large longitudinal sample of Australian adults (N = 2875). The same was done for each of the 15 Five-Factor Model trait facets in a subsample of these participants (n = 2424).

RESULTS

It was observed that more important values tended to remain more stable over time, while traits retained a similar stability regardless of trait strength, and frequently showed small decreases in stability at extreme levels.

CONCLUSIONS

Findings indicate that highly prioritized values may be a more central aspect of the self, and a more reliable element for predicting future outcomes, than less highly prioritized values, but in contrast, traits do not function in a way that is dependent on trait strength.

How are poor sleepers with other clinical conditions affected by maladaptive personality traits? A neural network-based analysis

Background

Psychopathology research mainly focused on the cross-sectional and longitudinal associations between personality and psychiatric disorders without considering the moment-to-moment dynamics of personality in response to environmental situations. The present study aimed to both cluster a young sample according to three mixed clinical conditions (poor sleep quality, depression, and somatization) and to predict the derived clusters by maladaptive personality traits and sex differences using a deep machine learning approach.

Methods

A sample of 839 adults aged 18-40 years (64% female) from the west of Iran were clustered according to the mixed clinical conditions using the cluster analysis techniques. An Artificial Neural Network (ANN) modeling is used to predict the derived clusters by maladaptive personality traits and biological gender. A receiver operating characteristic (ROC) curve was used to identify independent variables with high sensitivity specific to the derived clusters.

Results

The cluster analysis techniques suggested a fully stable and acceptable four-cluster solution for Depressed Poor Sleepers, Nonclinical Good Sleepers, Subclinical Poor Sleepers, and Clinical Poor Sleepers. The ANN model led to the identification of one hidden layer with two hidden units. The results of Area under the ROC Curve were relatively to completely acceptable, ranging from.726 to.855. Anhedonia, perceptual dysregulation, depressivity, anxiousness, and unusual beliefs are the most valuable traits with importance higher than 70%.

Conclusion

The machine learning approach can be well used to predict mixed clinical conditions by maladaptive personality traits. Future research can test the complexity of normal personality traits connected to mixed clinical conditions.

Personality traits and co-occurrence of depressive symptoms and high BMI: a prospective cohort study

We assess the associations between personality traits and co-occurrence of depressive symptoms and high BMI from adolescence to early adulthood. We employed a nationally representative cohort in China from 2010 to 2020 year. We included adolescents aged 10-19 years without depressive symptoms and unhealthy weight status (obesity, overweight, or thinness) at baseline and excluded those without any measurement of depressive symptoms or BMI at follow-ups. We assessed baseline personality traits in 7 dimensions of conscientiousness, openness, neuroticism, agreeableness, extraversion, self-esteem, and responsibility. We also assessed the combined effects of these 7 dimensions of personality traits by generating individual-level personality trait risk scores based on the weighted sum of all these 7 dimensions of personality traits. We measured the co-occurrence of depressive symptoms and high BMI using both a single measurement of depressive symptoms and BMI at the last follow-up and repeated measurements of them over 10 years. We used the multinomial logistic regression models to examine the exposure-outcome associations. At baseline, we included 1778 individuals (mean age: 14.4 year; female: 853 (48.0%)). At follow-ups, we observed increased risk of co-occurrence of depressive symptoms and high BMI per 1-SD increase in neuroticism score (1.95-2.38 odds ratio) or 1-SD decrease in self-esteem and conscientiousness (0.63-0.80 odds ratio; all P values < 0.05); we observed no evidence of associations between openness, agreeableness, extraversion, or responsibility and the risk of co-occurrence of depressive symptoms and high BMI (all P values > 0.05). For the combined effects of the 7 dimensions of personality traits, we found an elevated risk of co-occurrence of depressive symptoms and high BMI per 1-SD increase in the personality trait risk scores (OR (95% CI), single measurement at the last follow-up: 2.01, 1.66 to 2.43; trajectory classification using the repeated measurements 2.30, 1.55 to 3.42; average level using the repeated measurements: 2.27, 1.93 to 2.67). In this national cohort in China, personality traits were found to be associated with the co-occurrence of depressive symptoms and high BMI from adolescence to early adulthood. These findings highlight the importance of stratifying individuals based on their personality traits and providing targeted interventions for those at risk of comorbid depression and obesity.

Testosterone, gender identity and gender-stereotyped personality attributes

Sex/gender differences in personality associated with gender stereotyped behavior are widely studied in psychology yet remain a subject of ongoing debate. Exposure to testosterone during developmental periods is considered to be a primary mediator of many sex/gender differences in behavior. Extensions of this research has led to both lay beliefs and initial research about individual differences in basal testosterone in adulthood relating to "masculine" personality. In this study, we explored the relationships between testosterone, gender identity, and gender stereotyped personality attributes in a sample of over 400 university students (65 % female assigned at birth). Participants provided ratings of their self-perceived masculinity and femininity, resulting in a continuous measure of gender identity, and a set of agentic and communal personality attributes. A saliva sample was also provided for assay of basal testosterone. Results showed no compelling evidence that basal testosterone correlates with gender-stereotyped personality attributes or explains the relationship between sex/gender identity and these attributes, across, within, or covarying out sex assigned at birth. Contributing to a more gender diverse approach to assessing sex/gender relationships with personality and testosterone, our continuous measure of self-perceived masculinity and femininity predicted additional variance in personality beyond binary sex and showed some preliminary but weak relationships with testosterone. Results from this study cast doubt on the activational testosterone-masculinity hypothesis for explaining sex differences in gender stereotyped traits and within-sex/gender variation in attributes associated with agency and communality.

The association between smoking and family health with the mediation role of personality among Chinese people: nationwide cross-sectional study

BACKGROUND

There may be unexplored interactions between family health, personality, and smoking that could help provide new perspectives on tobacco control.

OBJECTIVE

To examine the relationship between the health of one's family and their smoking habits, as well as investigate the potential influence of personality on this relationship.

METHODS

For this cross-sectional investigation, a national survey conducted in China in 2022 recruited a total of 21,916 individuals. The Family Health Scale was utilized to assess the health of the family. The 10-item Big Five Inventory scale was utilized to assess the Big five personality traits. The relationship between big five personality, family health, and smoking were investigated using binary and linear logistic regression. The indirect effects mediated by Big five personality were analyzed using mediation analysis with Sobel tests, and the indirect effects were composited using the Karlson-Holm-Breen method.

RESULTS

The overall prevalence of smoking in the study population was 14.87%, 26.19% for males and 3.54% for females. Urban and rural smoking prevalence was 13.81% and 16.10% respectively. Binary logistic regression analysis revealed a significant negative relationship between smoking and family health (odds ratio 0.964, 95% CI 0.959, 0.970, P < 0.001) with covariates controlled. The Karlson-Holm-Breen composition facilitated the connection between extraversion (47.81%) and nervousness (52.19%).

CONCLUSIONS

Preventive interventions for smoking behavior should prioritize family health and the Big five personality as significant areas to focus on. According to this study, in addition to implementing various interventions for different personalities, family health should be strengthened to reduce smoking behavior.

The relevance of perceived work environment and work activities for personality trajectories in midlife

OBJECTIVES

Work is an important developmental context in adulthood, yet little is known about how it contributes to personality trajectories in midlife. The present study examines how subjectively perceived work environment (autonomy, innovation, social integration, stress) and objectively measured work activities (activities related to information and people, physical/manual activities) are related to levels of Big Five personality traits at age 44 and to change over 20 years.

METHODS

We analyzed four-wave longitudinal data from N = 374 participants (born 1950-1952; Mage T1 = 44 years, SD = 1; 44% women) from the Interdisciplinary Longitudinal Study of Adult Development and Aging (ILSE) within the structural equation modeling framework.

RESULTS

At baseline, subjective perceptions of work environments showed a higher number of significant associations with personality than objective work activities. Over time, small declines in neuroticism and extraversion and small increases in agreeableness and conscientiousness were observed, which were largely independent of work characteristics.

CONCLUSIONS

Our findings show slight changes in most Big Five traits from age 44 to 64, which were mostly unrelated to work characteristics. More research is needed to uncover the sources and dynamics of personality trait change in midlife and the role of work for personality trajectories.

Basic or Adaptation: The Assessment and Heritability of a Brief Measure of Agency

The interpersonal circumplex describes two major axes of personality that guide much of social behavior. Agency, one half of the interpersonal circumplex, refers to relatively stable behavioral patterns that center on self-focused dominance and assertiveness. Past empirical work on agency tends to treat the dimension as a characteristic adaptation, rather than a basic component of personality, in part due to the relatively large gender difference in agency with masculine individuals tending to behave more agentic. However, the psychometric overlap between agency and the most closely linked big five dimension, extraversion, is not well-established, and no behavior genetic work has documented evidence concerning the role of genetic and environmental influences. It is unclear whether agency is more similar to a personality trait, with no evidence of shared environmental influence and moderate heritability, or a characteristic adaptation, with some evidence for shared environmental influence and possibly lower heritability. We used the Midlife Development in the United States study to examine agency, big five, and generativity with replication and robustness check (Nnon-twins = 5,194; Ntwins = 1,914; NMilwaukee = 592). Results indicated that agency was higher in men (d = -.24), moderately heritable (44.4%), strongly correlated with extraversion (r = .51), moderately correlated with generativity (r = .36), and that approximately 40% of the variance in agency was shared with the big five. Agency also changed strongly with extraversion and openness, but less so generativity. Altogether, these results indicate that agency functions similar to other basic personality dimensions but is not clearly a dispositional trait.

The impact of virtual reality scenes on stress response characteristics of individuals with different personality traits

Virtual reality based physical stress (VRPS) paradigms could eliminate the influence of social factors on participants, and it may be a desirable tool to explore the impact of personality traits on stress levels. In this study, we attempt to explore the effects of VRPS on stress response among individuals with different personality traits. Forty male participants with an average age of 22.79 ± 0.41 years were divided into two groups based on Harm Avoidance (HA) scores of Tridimensional Personality Questionnaire (TPQ), referred to as the Low-HA group and the High-HA group. The stress levels of the participants were assessed using salivary α-amylase (sAA) activity and heart rate variability (HRV) indices pre- and post-stress. The influence of personality traits on stress response among different groups was analyzed. VRPS significantly affected the sAA activity and HRV indicators of both groups. During and after stress, there were significant differences in sAA activity and HRV indicators between the two groups. The sAA levels and HRV indices of the Low-HA group were lower than those of the High-HA group. Furthermore, sAA levels and HRV indices were correlated with the scores of TPQ. VRPS scenarios elicit different stress responses on individuals with different harm avoidance personality traits. Stress evaluation based on VR scenarios presents potential in personality trait assessments, particularly for distinguishing between individuals with low and high HA tendencies.

Correlation Analyses Between Childhood Behavioral Disturbance and Maternal Alexithymia: An Observational Study

Purpose

Caregivers' responses have an impact on children's emotional and behavioral development. The inability of caregivers to perceive their own emotions affects their responses to children. This study aims to examine the relationship between a mother's difficulties in emotional expression and children's emotional and behavioral disorders.

Patient and Methods

A total of 78 cases, aged between 3 and 15 years old, were included in this study. The mothers completed the Taiwan version of the "Toronto Alexithymia Scale" (TAS) and "Children's Behavior Checklist" (CBCL) questionnaires, which served as research tools. TAS consists of three factors: difficulty in distinguishing emotions (Factor 1, F1), difficulty in expressing feelings (Factor 2, F2), and an externally oriented thinking style (Factor 3, F3). CBCL represents a child's behavior profile. The Mann-Whitney test and correlation analyses were used for follow-up analysis.

Results

Our analysis revealed that F1, F2, F3, and total scores of TAS (TAS-Total) correlate positively with the somatic complaint subscale of CBCL (F1: p = 0.003; F2: p = 0.002; F3: p = 0.034, TAS-Total p=0.002). Additionally, TAS-F1 was positively correlated with the internalizing problems subscale of CBCL (p = 0.020) and the withdrawn (WD) subscale of CBCL (p = 0.044). We also found a significant association between TAS-F1 and WD of CBCL in boys alone (p = 0.022). However, we observed a negative association between TAS-F3 and the social problems subscale of CBCL in boys alone (p = 0.038).

Conclusion

Mothers with alexithymic features are more likely to have children who internalize emotions, leading to withdrawal and somatic expression. Boys tend to exhibit withdrawal traits associated with internalization. This study provides initial evidence of a partial correlation between maternal alexithymia and children's emotional and behavioral disorders, emphasizing the importance of investigating caregivers' emotional traits for a better understanding of children's development in the future.

The stability of personality disorders and personality disorder criteria: A systematic review and meta-analysis

The aim of this systematic review and meta-analysis was to investigate the diagnostic, the dimensional mean-level, and rank-order stability of personality disorders (PDs) and PD criteria over time. EMBASE, PsycInfo, PubMed, and Web of Science were searched for peer-reviewed studies published in either English, German, or French between the first publication of the third edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-III) in 1980 and December 20, 2022. Inclusion criteria were a prospective longitudinal study design, assessing the stability of PDs or PD criteria over at least two measurement occasions at least one month apart, and using the same assessment at baseline and follow-up. Effect sizes included proportion of enduring cases (i.e., diagnostic stability), test-retest correlations (i.e., dimensional rank-order stability), and within-group standardized mean differences (i.e., dimensional mean-level stability), based on the first and last available measurement occasion. From an initial pool of 1473 studies, 40 were included in our analyses, covering 38,432 participants. 56.7% maintained the diagnosis of any PD, and 45.2% maintained the diagnosis of borderline PD over time. Findings on the dimensional mean-level stability indicate that most PD criteria significantly decreased from baseline to follow-up, except for antisocial, obsessive-compulsive, and schizoid PD criteria. Findings on the dimensional rank-order stability suggested moderate estimates, except for antisocial PD criteria, which were found to be high. Findings indicated that both PDs and PD criteria were only moderately stable, although between study heterogeneity was high, and stability itself depended on several methodological factors.

Toward a better understanding of the causal effects of role demands on work-family conflict: A genetic modeling approach

Over the past several decades, there has been considerable interest in the theoretical causes of work-family conflict (WFC). Most studies have focused on situational determinants, often ignoring the role of personal factors such as disposition and heritable elements. We increase understanding of person versus situation influences on WFC through estimation of the relationship between role demands and WFC after controlling for genetic confounding, measured personality traits, family confounds, and other stable dispositions. Based on twin data from the National Survey of Midlife Development in the United States (MIDUS), we examine the role of genetic factors in explaining variation in WFC (both work interference with family [WIF] and family interference with work [FIW]). Results support WFC has an additive genetic component, accounting for 31% [95% CI 18%, 45%] and 16% [95% CI 2%, 30%] of the variance in WIF and FIW, respectively. In addition, we test two competing hypotheses with regard to the relationship between role demands and WFC. Results support the phenotypic causal relationship for WIF, consistent with the notion the relationship between work demands and WIF reflect situational processes. However, results support the genetic confounding hypothesis for FIW, indicating observed relationships between family demands and FIW are primarily due to genetic factors. Our results provide new insights into the nature of WFC relationships and underscore that ignoring the influence of heritability can bias estimates of role demand effects in WFC research. (PsycInfo Database Record (c) 2023 APA, all rights reserved).

The evolution of personality disorders: A review of proposals

Personality disorders (PDs) are currently considered dysfunctions. However, personality differences are older than humanity and are ubiquitous in nature, from insects to higher primates. This suggests that a number of evolutionary mechanisms-other than dysfunctions-may be able to maintain stable behavioral variation in the gene pool. First of all, apparently maladaptive traits may actually improve fitness by enabling better survival or successful mating or reproduction, as exemplified by neuroticism, psychopathy, and narcissism. Furthermore, some PDs may harm important biological goals while facilitating others, or may be globally beneficial or detrimental depending on environmental circumstances or body condition. Alternatively, certain traits may form part of life history strategies: Coordinated suites of morphological, physiological and behavioral characters that optimize fitness through alternative routes and respond to selection as a whole. Still others may be vestigial adaptations that are no longer beneficial in present times. Finally, variation may be adaptative in and by itself, as it reduces competition for finite resources. These and other evolutionary mechanisms are reviewed and illustrated through human and non-human examples. Evolutionary theory is the best-substantiated explanatory framework across the life sciences, and may shed light on the question of why harmful personalities exist at all.

The Trajectory of Anthropomorphism and Pro-Environmental Behavior: A Serial Mediation Model

Anthropomorphism of nature can promote pro-environmental behavior (PEB). However, its underlying mechanism and these age-related changes are unclear. We propose that connectedness to nature and environmental guilt mediate the relationship between anthropomorphism of nature and PEB. The present study tests the hypotheses based on a cross-sectional sample of 1364 residents aged 15-76 years, using structural equation modeling. We found that: (1) environmental guilt decreases, but PEB increases, with age; (2) anthropomorphism of nature decreases in early adulthood and increases in old age; (3) connectedness to nature decreases in mid-late adolescence and increases in early adulthood. Connectedness to nature and environmental guilt have a serial mediating effect in the relationship between anthropomorphism of nature and PEB, with cross-age stability. These findings contribute to enriching the understanding of PEB from the human and nature perspective, and enhancing anthropomorphism of nature that could promote PEB in residents at different ages, through connectedness to nature and environmental guilt.

Sibling relationship quality and parental rearing style influence the development of Dark Triad traits

Currently our understanding of environmental factors that influence the development of dark personality traits (DT) is limited. Therefore, we conducted three studies using online questionnaires, each examining a different aspect of the relation between dark personality traits and family environment. In Study 1, 117 adults (mean age: 30.36 years, SD = 10.19) filled out questionnaires regarding their childhood relationship with siblings and their own DT traits. We found that the amount of conflicts with siblings during adolescence correlated positively with Machiavellianism and psychopathy. The feeling of closeness towards the siblings showed negative correlation with Machiavellianism. Parental partiality towards the other sibling was positively correlated with narcissism. In Study 2, 111 adolescents (mean age: 15.92, SD = 1.24) reported their perceptions of the rearing style of their parents, in addition to their sibling relationships and DT traits. Perceived parental emotional warmth was negatively associated, whereas both rejection and overprotection were positively correlated with psychopathy. Parental warmth was positively, while rejection negatively associated with narcissism. Machiavellianism was positively associated with the amount of conflicts with siblings, but negatively with closeness to siblings. In Study 3, 110 adults (mean age: 32.62 years, SD = 12.25) reported their levels of the Vulnerable Dark Triad that included measures of primary and secondary psychopathy, maladaptive covert narcissism, and borderline personality organization. Results indicated that sibling relation quality had a significant effect on primary psychopathy and borderline traits. Parental rejection and overprotection correlated with borderline traits and vulnerable narcissism. The results of these studies shed some light on how environmental impulses, particularly the quality of relationships between family members, affect the development of personality.

Trait resilience as a moderator between personality dysfunction and caregiving stress in caregivers of children and adults with developmental disabilities

Background

Long-term care of a relative with a disability is associated with negative consequences on the caregiver's mental health. Therefore, investigating how some personality traits, such as resilience, protect caregivers with dysfunctional personality traits from caregiving stress is necessary. This study examines the moderating role of resilience in the relationship between caregiver's personality dysfunction and care stress.

Methods

A total of 224 family caregivers of children and adults with developmental disabilities participated in this cross-sectional research. They completed self-report measures of resilience, personality dysfunction, and care stress.

Results

The results show that medium and high levels of resilience protect familial caregivers from the adverse effects of personality dysfunction on stress. The relationship is maintained for three of the five dysfunctional personality traits (antagonism, disinhibition, and psychoticism).

Conclusions

From a theoretical point of view, the results show the contribution of the dimensional personality model to the study of caregiving stress. From a practical standpoint, the results can be used to optimise the resilience of familial caregivers, providing them with tools to take better care of their relatives.

Risk of Personality disorders among childhood maltreatment victims: A nation-wide population-based study in Taiwan

BACKGROUND

To date, numerous cohort studies and meta-analyses have shown that childhood maltreatment is associated with a wide range of adverse physiological and psychological symptoms. Although childhood maltreatment has been linked to an increased risk of personality disorders, the direction and magnitude of the association remain uncertain. Therefore, this cohort study aimed to evaluate whether children who have suffered childhood maltreatment have a higher incidence of subsequent personality disorders, using a nationwide database in Taiwan.

METHODS

We conducted a large retrospective cohort study using data drawn from Taiwan's National Health Insurance Research Database between 2000 and 2015. A total of 10,345 children who experienced childhood maltreatment were identified using International Classification of Disease codes. They were then compared with 41,380 children who never experienced childhood maltreatment in terms of the prevalence rates of personality disorders.

RESULTS

Childhood maltreatment was associated with an increased risk of personality disorders (considering the control as reference: adjusted hazard ratio, 2.12; 95% confidence interval, 1.90-2.36; p < 0.001). The Kaplan-Meier analysis revealed a significantly higher 15-year cumulative incidence of personality disorders among childhood maltreatment victims than among controls (log-rank test, p < 0.001).

CONCLUSIONS

The present population-based study showed a positive association between prior childhood maltreatment and subsequent personality disorders in the general Taiwanese population. In order to reduce the risk of personality disorders, interventions should be implemented, identifying and supporting economically disadvantaged families and vulnerable children as early as possible.

Gender Differences in Theory of Mind, Empathic Understanding, and Moral Reasoning in an Offending and a Matched Non-Offending Population

Previous research suggests that a lack of pro-social skills is characteristic of an offending personality. Two hundred male and female offenders and matched controls completed measures to assess: Theory of Mind, empathic understanding, and moral reasoning. Significant differences between the offenders and the control group, as well as between the male and female participants, were detected in theory of mind, empathic understanding and moral reasoning with offenders scoring lower than the control group, and with males scoring lower than females on most tests. The ability to assess Theory of Mind, empathic understanding, and moral reasoning, and subsequently to identify reduced ability, is not only useful for researchers but will also allow practitioners to tailor existing (or develop new) interventions specific to the needs of individuals. This could be particularly useful in terms of recidivism when applied to those involved in anti-social or offending behavior.

Prevalence and 10-Year Stability of Personality Disorders From Adolescence to Young Adulthood in a High-Risk Sample

Background

With the implementation of the 11th edition of the International Classification of Diseases (ICD-11) in early 2022, there will be a radical change in the framework and process for diagnosing personality disorders (PDs), indicating a transition from the categorical to the dimensional model. Despite increasing evidence that PDs are not as stable as previously assumed, the long-term stability of PDs remains under major debate. The aim of the current paper was to investigate the categorical and dimensional mean-level and rank-order stability of PDs from adolescence into young adulthood in a high-risk sample.

Methods

In total, 115 young adults with a history of residential child welfare and juvenile-justice placements in Switzerland were included in the current study. PDs were assessed at baseline and at a 10-year follow-up. On a categorical level, mean-level stability was assessed through the proportion of enduring cases from baseline to follow-up. Rank-order stability was assessed through Cohen's κ and tetrachoric correlation coefficients. On a dimensional level, the magnitude of change between the PD trait scores at baseline and at follow-up was measured by Cohen's d. Rank-order stability was assessed through Spearman's ρ.

Results

The prevalence rate for any PD was 20.0% at baseline and 30.4% at follow-up. The most frequently diagnosed disorders were antisocial, borderline, and obsessive-compulsive PDs, both at baseline and at follow-up. On a categorical level, the mean-level stability of any PD was only moderate, and the mean-level stability of specific PDs was low, except of schizoid PD. Likewise, the rank-order stability of any PD category was moderate, while ranging from low to high for individual PD diagnoses. On a dimensional level, scores increased significantly for most PDs, except for histrionic traits, which decreased significantly from baseline to follow-up. Effect sizes were generally low. The rank-order stability for dimensional scores ranged from low to moderate.

Conclusion

The findings indicate low to moderate stability of Pds and Pd traits from adolescence to adulthood, which supports the growing evidence that categorical diagnoses of Pds are quite unstable. This in turn, emphasizes the use of the upcoming ICD-11 that Acknowledgments Pds to be only "relatively" stable.

Understanding early-life pain and its effects on adult human and animal emotionality: Translational lessons from rodent and zebrafish models

Critical for organismal survival, pain evokes strong physiological and behavioral responses in various sentient species. Clinical and preclinical (animal) studies markedly increase our understanding of biological consequences of developmental (early-life) adversity, as well as acute and chronic pain. However, the long-term effects of early-life pain exposure on human and animal emotional responses remain poorly understood. Here, we discuss experimental models of nociception in rodents and zebrafish, and summarize mounting evidence of the role of early-life pain in shaping emotional traits later in life. We also call for further development of animal models to probe the impact of early-life pain exposure on behavioral traits, brain disorders and novel therapeutic treatments.

Non-human contributions to personality neuroscience – from fish through primates. An introduction to the special issue

The most fundamental emotional systems that show trait control are evolutionarily old and extensively conserved. Psychology in general has benefited from non-human neuroscience and from the analytical simplicity of behaviour in those with simpler nervous systems. It has been argued that integration between personality, psychopathology, and neuroscience is particularly promising if we are to understand the neurobiology of human experience. Here, we provide some general arguments for a non-human approach being at least as productive in relation to personality, psychopathology, and their interface. Some early personality theories were directly linked to psychopathology (e.g., Eysenck, Panksepp, and Cloninger). They shared a common interest in brain systems that naturally led to the use of non-human data; behavioural, neural, and pharmacological. In Eysenck’s case, this also led to the selective breeding, at the Maudsley Institute, of emotionally reactive and non-reactive strains of rat as models of trait neuroticism or trait emotionality. Dimensional personality research and categorical approaches to clinical disorder then drifted apart from each other, from neuropsychology, and from non-human data. Recently, the conceptualizations of both healthy personality and psychopathology have moved towards a common hierarchical trait perspective. Indeed, the proposed two sets of trait dimensions appear similar and may even be eventually the same. We provide, here, an introduction to this special issue of Personality Neuroscience, where the authors provide overviews of detailed areas where non-human data inform human personality and its psychopathology or provide explicit models for translation to human neuroscience. Once all the papers in the issue have appeared, we will also provide a concluding summary of them.

Continuity and Change in the Genetic and Environmental Etiology of Youth Antisocial Behavior

Trajectories of youth antisocial behavior (ASB) are characterized by both continuity and change. Twin studies have further indicated that genetic factors underlie continuity, while environmental exposures unique to each child in a given family underlie change. However, most behavioral genetic studies have examined continuity and change during relatively brief windows of development (e.g., during childhood but not into adolescence). It is unclear whether these findings would persist when ASB trajectories are examined across multiple stages of early development (i.e., from early childhood into emerging adulthood). Our study sought to fill this gap by examining participants assessed up to five times between the ages of 3 and 22 years using an accelerated longitudinal design in the Michigan State University Twin Registry (MSUTR). We specifically examined the etiologies of stability and change via growth curve modeling and a series of univariate and bivariate twin analyses. While participants exhibited moderate-to-high rank-order stability, mean levels of ASB decreased linearly with age. Genetic and nonshared environmental influences that were present in early childhood also contributed to both stability and change across development, while shared environmental contributions were negligible. In addition, genetic and nonshared environmental influences that were not yet present at the initial assessment contributed to change over time. Although ASB tended to decrease in frequency with age, participants who engaged in high levels of ASB during childhood generally continued to do so throughout development. Moreover, the genetic and nonshared environmental contributions to ASB early in development also shaped the magnitude of the decrease with age.

Gender differences in the relationship between perceived discrimination and personality traits in young adulthood: Evidence using sibling fixed effects

RATIONALE

Although perceived discrimination (PD) is known to be associated with personality traits, family background characteristics may confound this association. Moreover, little is known about whether the relationship differs by gender.

OBJECTIVE

This study investigates whether the association between PD and personality traits is confounded by family background characteristics. Given gender differences in contexts and perceptions of discrimination as well as personality traits, this study also explores whether the association between PD and personality traits differs for men and women.

METHODS

Using data from the National Longitudinal Study of Adolescent to Adult Health, this study examines the association between PD and Big Five personality traits among young adults. This study uses sibling fixed effects models with a lagged dependent variable to account for unobservable family-level characteristics, such as genetics, parental characteristics, family environment, and childhood social contexts.

RESULTS

Sibling fixed effects estimates showed that PD was associated with lower levels of conscientiousness and extraversion and higher levels of neuroticism. There were also gender differences such that PD was associated with lower conscientiousness only for women and lower extraversion only for men. The positive association with neuroticism was apparent for both men and women.

CONCLUSION

This study suggests that the association between PD and personality traits is generally not confounded by stable family-level characteristics shared by siblings. This study also documents gender differences in the relationship between PD and personality traits. Given substantial implications of personality for a broad range of outcomes, especially among young adults, the findings of this study reaffirm the commitment of the whole society to eradicate any form of discrimination.

Personality, health behaviours and physical health in young adulthood

OBJECTIVE

Personality traits and health are strongly correlated, but unobserved family-level characteristics may confound this relationship. This study investigates whether associations between personality traits and physical health are spurious owing to unobserved family background.

DESIGN

Participants were from the National Longitudinal Study of Adolescent to Adult Health. This study employed sibling fixed-effect approach to account for unobserved family characteristics.

MAIN OUTCOME MEASURES

Main dependent variables were Framingham Risk Scores for 30-year full cardiovascular disease (CVD) and metabolic syndrome.

RESULTS

Sibling fixed-effects models showed that conscientiousness is associated with reductions in CVD risk and metabolic syndrome, and that neuroticism is associated with an increase in both conditions. A higher extraversion score is positively associated with CVD risk. The adverse effect of extraversion on CVD risk is larger among females, and the protective effect of conscientiousness is larger among males. Moreover, while extraversion, neuroticism and conscientiousness are associated with health behaviours in somewhat distinct ways, the associations for agreeableness and openness are spurious owing to unobserved family background.

CONCLUSION

This study ruled out the concern that unobserved family background drives the personality-physical health link. Mechanisms linking personality to physical health may be gendered.

Moving Toward Decent Work: Application of the Psychology of Working Theory to the School-to-Work Transition

This conceptual contribution aims to adapt and apply Psychology of Working Theory to the specificities of the school-to-work transition (STWT) process. The STWT is thus conceptualized as a first attempt to access decent work under the influence of specific predictors, mediators, and moderators and leading to particular outcomes. Based on recent literature, we consider that (1) socioeconomic constraints and belonging to marginalized groups are contextual predictors of a successful transition; (2) psychosocial resources, including self-efficacy and adaptability, and vocational and work role identity, are mediators of the relation between contextual factors and a successful transition; (3) moderator factors include the education system, labor market conditions, social support, and critical consciousness; and (4) decent and meaningful work are the optimal outcomes of the STWT process.

Adolescent Big Five personality and pubertal development: Pubertal hormone concentrations and self-reported pubertal status

In early adolescence, levels of conscientiousness and agreeableness have been found to temporarily decrease, with levels of neuroticism increasing, indicating a dip in personality maturation. It is unknown whether these changes are related to the process of puberty, a major developmental milestone with numerous changes for children. Here, we first replicated the dip in personality maturity in early adolescence (N = 2640, age range 8-18, 51% girls, 65% non-Hispanic white, 21% Hispanic/Latino, 10% African American, 9% other, roughly 33% of families received means-tested public assistance) and tested associations between the Big Five personality dimensions and pubertal development and timing across late childhood and adolescence (n = 1793). Pubertal development was measured using both hormonal assays (DHEA, testosterone, and progesterone) and self-reports of secondary sex characteristics. Of hormonal measures, only higher DHEA concentrations were associated with lower conscientiousness and openness. Nonparametric moderation analyses using LOSEM indicated Complex Age × Sex interactions involving all three hormones. Self-reported pubertal development was associated with lower extraversion, conscientiousness, agreeableness, and openness. More advanced pubertal timing was also related to lower levels of extraversion, conscientiousness, and agreeableness. All associations were small. As some evidence was found for small associations between pubertal development and lower levels of conscientiousness and agreeableness, a dip in personality maturation in these personality traits may be partly due to pubertal development in early adolescence. Overall, results did not indicate that pubertal development was the primary explanation of the maturity dip in adolescent personality. Many small influences likely accumulate to explain the dip in personality maturity in early adolescence. (PsycInfo Database Record (c) 2020 APA, all rights reserved).

Psychological distress and attachment styles in emerging adult students attending and not attending a university counselling service

Emerging adulthood is a turning point in the life cycle with regard mental health. To assess psychological distress and attachment styles 688 university students of which 370 requested a counselling support responded to Symptom Checklist 90 Revised and Attachment Style Questionnaire. Counselling attending students (vs counselling non-attending students) have a higher psychological risk profile, with more psychological distress and insecure attachment. A marked percentage of students not attending counselling presents psychological distress. In both groups associations emerged between psychopathological problems and insecure attachment. The importance of communication strategies aimed to those students who, albeit non requesting psychological help, display psychological distress is discussed.

Effectiveness of a university counseling intervention based on a psychodynamic approach

The study examined the effectiveness of a brief psychodynamic counseling intervention on psychological distress and general life satisfaction in a sample of 124 students by comparing pre- and posttreatment data. The authors also tested the moderating role of pretreatment attachment styles. Results showed that most participants (57%) can be classified as a nonclinical population, whereas only a minority of participants belong to a clinical population (17%) and a subclinical population (26%) according to the Symptom Checklist 90 Revised (SCL-90-R). Psychodynamic counseling intervention was shown to be associated with a decrease in the Global Severity Index and the anxiety and depression subscales of the SCL-90-R. Clinical effectiveness was greater for participants belonging to the clinical group. General life satisfaction increased significantly for all students. The authors found no moderation effect of attachment styles. Brief psychodynamic counseling intervention was associated with a reduction of psychological distress and an increase in life satisfaction.

Antecedents of Thai student teacher sustainable consumption behavior

A new area of research and intervention has arisen, namely the psychology of sustainability. Therefore, this study investigates how an undergraduate student teacher's psychological traits, their psychological state, their situation, and environmental education affect their sustainable consumption behavior. Two sample groups were selected from ten Thai university education programs' science (n = 400) and social science (n = 400) colleges nationwide. The research instrument used randomized multistage questionnaires for each group, which used a five-level scale to evaluate each student teacher's item agreement. The analysis of the causal relationship models used LISREL 9.10 which determined that both models and their four causal variables positively affected a Thai student teacher's sustainable consumption behavior (SCB). For the science education student teachers, these were the situation (SIT = 0.87), environmental education (EDU = 0.34), their psychological state (STATE = 0.22), and their psychological traits (TRAITS = 0.22). For the social science education student teachers, these were SIT = 0.85, STATE = 0.25, EDU = 0.08, and TRAITS = 0.04. Combined, they can explain 92% (science program) and 82% (social science program) of variance in a student teacher's SCB. The study also determined that EDU's attitude and conservation factors were critical, which most probably increased in prominence due to media awareness efforts. There also appears to be greater individual responsibility in SCB as well as the perceived need to conserve resources. Finally, this study further confirmed numerous other studies in which humans have a strong desire to fit in and will conform to the behavior of those around them, with this study concluding that each student teacher's situation was determined to have a moderate to strong influence on either their psychological state or environmental education. This study contributed to the literature as it investigated 18 aspects related to four casual variables affecting a Thai student teacher's sustainable consumption behavior. The study was unique in that it classified and compared opinions from two diverse university teaching programs nationwide (Science and Social Science), whose results can help educational leaders identify and develop in-depth, SCB future programs.

Personality trait change at work: Associations with organizational socialization and identification

OBJECTIVE

This study investigates associations between Big Five personality trait change, organizational socialization, and organizational identification during a 3-year police officer training program (N = 416 police officer cadets).

METHOD

Participants completed a questionnaire measuring the Big Five personality traits when they entered the training academy, and then, completed the same personality questionnaire, along with measures of organizational socialization and identification, during their 2nd (n = 360) and 3rd (n = 397) year of training.

RESULTS

Results corroborated the hypotheses that (a) the Big Five traits can show systematic changes even across a relatively short time period and (b) this change is functional, given that the latent difference scores of all Big Five traits significantly predicted increases in organizational socialization and identification.

CONCLUSION

The Big five personality traits showed significant mean level changes across the 3-year training program. Although these changes were not fully consistent with theoretical expectations, they did predict two aspects of organizational adjustment (socialization and identification). The theoretical and practical implications of these findings were discussed.

Longitudinal Experience–Wide Association Studies—A Framework for Studying Personality Change

The importance of personality for predicting life outcomes in the domains of love, work, and health is well established, as is evidence that personality traits, while relatively stable, can change. However, little is known about the sources and processes that drive changes in personality traits and how such changes might impact important life outcomes. In this paper, we make the case that the research paradigms and methodological approaches commonly used in personality psychology need to be revised to advance our understanding of the sources and processes of personality change. We propose Longitudinal Experience–Wide Association Studies as a framework for studying personality change that can address the limitations of current methods, and we discuss strategies for overcoming some of the challenges associated with Longitudinal Experience–Wide Association Studies. © 2020 European Association of Personality Psychology

The Stability and Change of Loneliness Across the Life Span: A Meta-Analysis of Longitudinal Studies

Individuals experience loneliness when they perceive a deficiency in the quality or quantity of their social relationships. In the present meta-analysis, we compiled data from 75 longitudinal studies conducted in Asia, Australia, Europe, and North America (N = 83, 679) to examine the rank-order and mean-level development of loneliness across the life span. Data were analyzed using two- and three-level meta-analyses and generalized additive mixed models. The results indicate that the rank order of loneliness is as stable as the rank order of personality traits and follows an inverted U-shaped trajectory across the life span. Regarding mean-level development, loneliness was found to decrease throughout childhood and to remain essentially stable from adolescence to oldest old age. Thus, in contrast to other personality characteristics, changes in loneliness are not generally related to age. Implications for theory are discussed.

The development of effortful control from late childhood to young adulthood

The present study investigated the developmental precursors of effortful control, a temperament trait that involves the propensity to regulate one's impulses and behaviors, to motivate the self toward a goal when there are conflicting desires, and to focus and shift attention easily. Data came from the California Families Project, a multimethod longitudinal study of 674 Mexican-origin youth (and their parents), who were assessed at ages 10, 12, 14, 16, and 19. Effortful control (measured via self- and parent-reports) was moderately stable over time (r = .47 from age 10 to 19), and its developmental trajectory followed a u-shaped pattern (decreasing from age 10 to 14, before increasing from age 14 to 19). Findings from latent growth curve models showed that youth who experience more hostility from their parents, associate more with deviant peers, attend more violent schools, live in more violent neighborhoods, and experience more ethnic discrimination tend to exhibit an exacerbated dip in effortful control. In contrast, youth with parents who closely monitor their behavior and whereabouts exhibited a shallower dip in effortful control. Analyses of the facets of effortful control revealed important disparities in their trajectories; specifically inhibitory control showed linear increases, attention control showed linear decreases, and activation control showed the same u-shaped trajectory as overall effortful control. Moreover, most of the precursors of effortful control replicated for inhibitory control and attention control, but not for activation control. We discuss the broader implications of the findings for adolescent personality development and self-regulation. (PsycInfo Database Record (c) 2020 APA, all rights reserved).

Emerging Adulthood, a Pre-adult Life-History Stage

The duration of human maturation has been underestimated; an additional 4-6-year pre-adult period of "emerging adulthood," should be included in models of human maturation. It is a period of brain maturation, learning about intimacy and mutual support, intensification of pre-existing friendships, family-oriented socialization, and the attainment of those social skills that are needed for mating and reproduction. We propose that emerging adulthood is a life-history stage that is a foundation of the high reproductive success of human beings. The period of emerging adulthood has an evolutionary context and developmental markers, and we present evidence that supports the idea that emerging adults require protection because they are still learning and maturing.

Big Five personality domains and relationship satisfaction: Direct effects and correlated change over time

OBJECTIVE

The Big Five Model (BFM) of personality domains is significantly related to romantic relationship outcomes, particularly marital satisfaction. Few studies to date, however, have examined the BFM domains and relationship outcomes longitudinally.

METHOD

We used latent growth curve modeling to estimate the initial levels (intercept) and the rate of change (slope) in the BFM domains and marital satisfaction and determine if change in one construct was associated with change in the other. All available data were retained from participants who remained married to the same individual, as well as early waves for participants who divorced or were widowed, in the Midlife in the United States study (N = 1,965). We expected negative associations between (a) intercepts of Neuroticism and relationship satisfaction and (b) the intercept/slope of Neuroticism with change in marital satisfaction. The other BFM domains were expected to have positive effects on change in satisfaction.

RESULTS

The results suggested that change over time in Neuroticism and Conscientiousness is detrimental to satisfaction, while initial levels of Conscientiousness may predict declining marital satisfaction.

CONCLUSIONS

Changes in Neuroticism accompany parallel changes in relationship satisfaction in a large sample of married U.S. adults, suggesting an ongoing bidirectional influence between these constructs in enduring marriages.

Testing Competing Hypotheses on the Interplay of Importance and Support of the Basic Psychological Needs at Work and Personality Development with Response Surface Analysis

Even though environmental contexts have been associated with personality development, little attention has been paid to individuals’ psychological perceptions thereof. Basic psychological needs theory assesses environments based on their levels of autonomy, competence, and relatedness support. In order to better understand the factors that drive personality development we related the support of basic psychological needs (BPN) and the individual importance ascribed to BPN support to Big Five personality development 1.5 years later. We focused on the context of the first job in a longitudinal study of young Germans (NT1 = 1,886; MageT1 = 18.41). Based on theory and previous research we derived multiple hypotheses and tested them simultaneously against each other with an information theoretic approach including response surface analyses. Results differed across the Big Five: Controlling for personality at T1, people who ascribed greater importance to BPN support, had higher perceptions of BPN support, and who had an incongruence between the two at T1 were higher in emotional stability and extraversion at T2. The pattern was more complex for openness, whereas individuals ascribing more importance to BPN support at T1 were more agreeable and conscientious at T2. Findings are discussed for theory and future research of personality development.

Personality Change in Middle Adulthood: With Focus on Differential Susceptibility

Little attention has been paid to middle adulthood in research on personality stability and change. In addition, previous research on individual differences in personality change has not fully explained its variability. This study focused on the differential susceptibility model, which suggests that individual susceptibility interacts with environmental factors and produces variability in outcomes, and investigated individual differences in personality change with a middle adult sample. A total of 1051 Japanese middle adults (M = 41.61 years; SD = 5.31; range 30-50 years; 534 females) participated in this two-wave short-term longitudinal study. Latent change score model analyses revealed substantial mean-level declines in Agreeableness and Honesty-Humility. Moreover, the results showed that the influences of some life events on personality change are moderated for better and for worse by individual susceptibility to one's environment. These findings suggest that the trends of personality development may differ between Western and non-Western countries and that differential susceptibility model may play an important role in deriving individual differences in personality stability and change.

Cognitive function among schoolchildren in Lebanon: association with maternal alcohol drinking and smoking during pregnancy and domestic use of detergents and pesticides during childhood

To evaluate the relation between caregiver exposure to toxics during pregnancy and childhood and the child's cognitive function in Lebanese children. This was a cross-sectional study conducted on Lebanese students in public and private schools from November 2017 to May 2018, enrolling 464 children. A first linear regression, taking the Cattell total score as the dependent variable and taking sociodemographic characteristics and the family history of the child as independent variables, showed that higher age (Beta = 1.65) was significantly associated with higher cognition, whereas a history of eczema in any of the parents (Beta = -7.32) was significantly associated with lower cognition in the child. A second linear regression, taking the Cattell total score as the dependent variable and taking sociodemographic characteristics and the family history of the child, and the exposure to toxics as independent variables, showed that maternal alcohol intake during pregnancy (Beta = -1.07) and detergent mixing (Beta = -1.48) were significantly associated with lower cognition in the child. A third linear regression, taking the Cattell total score as the dependent variable and taking sociodemographic characteristics and the family history of the child, the exposure to toxics and the diseases in the child as independent variables, showed that maternal alcohol intake during pregnancy (Beta = -1.07) and detergent mixing (Beta = -1.45) were significantly associated with lower cognition in the child, whereas a history of eczema in the child before the age of 2 years (Beta = 8.72) was significantly associated with higher cognition in the child. This study is the first to examine the association of a child's prenatal exposure and their exposure during childhood to environmental toxicants with their cognitive function in Lebanon. We consider this study to be important as it shows the possible effect of cleaning products mixing and maternal alcohol consumption on cognitive functions among children in Lebanon.

Personality and the Social Environment: Contributions to Psychological Adjustment Among Asian and Euro American Students

Introduction: Although personality and sociocultural experiences shape how people adapt to changing life circumstances, these factors’ contributions to psychological adjustment outcomes may differ across ethnic groups. Previous research has shown that personality traits predict psychological distress and wellbeing, and people's comfort with their social environments and interpersonal relationships also can be instrumental in understanding their psychological adjustment. Research on personality and on environmental characteristics have tended to focus on Euro Americans and on people of color, respectively; the extent to which campus climate and ethnic group contact predict psychological adjustment above and beyond personality remains understudied and unclear.

Method: Relative influences of Big 5 personality and environmental characteristics at a predominantly White college were tested as predictors of psychological adjustment among Asian (N = 412; 48.5% women, Mage = 19.60) and Euro American (N = 277; 47.7% women, Mage = 19.46) students.

Results: Measurement invariance tests showed that only a subset of the NEO Five Factor Inventory was equivalent across groups. Hierarchical multiple regressions showed that personality contributed to depression and anxiety symptoms for both groups, but comfort with campus environment and ethnic social comfort were distinctively important predictors of Asians’ psychological adjustment.

Discussion: Implications for research, professional services, and university practices are discussed.

Interpersonal Dynamics in Personality and Personality Disorders

Clinical and basic personality psychologists interact less than they should, given their similar interests. In clinical personality psychology, available evidence supports a transition from the current categorical system to a hierarchical trait scheme for diagnosing the stable features of personality disorder. However, trait models do not capture the dynamic aspects of personality disorders as they have been described in the clinical literature, and thus miss a clinically critical feature of personality pathology. In contrast, basic personality psychologists have coalesced around a consensual structure of individual differences and become increasingly interested in the dynamic processes that underlie and contextualize traits. But trait psychology models are not sufficiently specific to characterize dynamic personality processes. In this paper, I filter clinical descriptions of personality disorders through the lens of interpersonal theory to specify a recursive within–situation interpersonal pattern of motives, affects, behaviours, and perceptions that could contribute to the stable between–situation patterns of maladaptive behaviour of historical interest to both basic and clinical personality psychologists. I suggest that this interpersonal model adds specificity to recent proposals regarding processes in the basic personality literature and has significant potential to advance research on personality dynamics. © 2018 European Association of Personality Psychology

Adult roles as predictors of adult identity and identity commitment in Polish emerging adults: Psychosocial maturity as an intervening variable

In the present study, we examined the relationships between adult identity, strength of identity commitments, and their potential determinants: number of adult social roles undertaken and psychosocial maturity. A total of 358 emerging adults aged 18 to 30 participated. Structural equation modelling analyses indicated that psychosocial maturity dimensions served as intervening variables between adult roles on the one hand and adult identity and identity commitments on the other. The results suggest that vocational and familial adult roles can be related to different aspects of psychosocial maturity. Implications and suggestions for future research are discussed.