Latent profiles of DSM-5 PTSD symptoms and the “Big Five” personality traits

Typologies of DSM-5 PTSD symptoms and personality traits were evaluated in regard to coping styles and treatment preferences using data from 1266 trauma-exposed military veterans of which the majority were male (n = 1097; weighted 89.6%). Latent profile analyses indicated a best-fitting 5-class solution; PTSD asymptomatic and emotionally stable (C1); predominant re-experiencing and avoidance symptoms and less emotionally stable (C2); subsyndromal PTSD (C3); predominant negative alterations in mood/cognitions and combined internalizing–externalizing traits (C4); and high PTSD severity and combined internalizing–externalizing traits (C5). Compared to C5, C1 members were less likely to use self-distraction, denial, and substance use and more likely to use active coping; C2 and C4 members were less likely to use denial and more likely to use behavioral disengagement; C3 members were less likely to use denial and instrumental coping and more likely to use active coping; most classes were less likely to seek mental health treatment. Compared to C1, C2 members were more likely to use self-distraction, substance use, behavioral disengagement and less likely to use active coping; C3 members were more likely to use self-distraction, and substance use, and less likely to use positive reframing, and acceptance; and C4 members were more likely to use denial, substance use, emotional support, and behavioral disengagement, and less likely to use active coping, positive reframing, and acceptance; all classes were more likely to seek mental health treatment. Emotional stability was most distinguishing of the typologies. Other implications are discussed.     

Heritability of personality disorder traits: a twin study

Genetic and non-genetic influences on the hierarchy of traits that delineate personality disorder as measured by the Dimensional Assessment of Personality Problems (DAPP-DQ) scale were examined using data from a sample of 483 volunteer twin pairs (236 monozygotic pairs and 247 dizygotic pairs). The DAPP-DQ assesses four higher-order factors, 18 basic dimensions and 69 facet traits of personality disorder. The correlation coefficients for monozygotic and dizygotic twin pairs ranged from 0.26 to 0.56 and from 0.03 to 0.41, respectively. Broad heritability estimates ranged from 0 to 58% (median value, 45%). Additive genetic effects and unique environmental effects emerged as the primary influences on these scales, with unique environmental influences accounting for the largest proportion of the variance for most traits at all levels of the hierarchy.     

Trait emotional intelligence,the Big Five personality traits and isometric maximal voluntary contraction level under stress in athletes

ObjectivesThe purpose of the study was to investigate the effects of trait emotional intelligence (EI) and the Big Five personality traits on athletes’ ability to tolerate stress during isometric maximal voluntary contraction (MVC).MethodsFifty-two elite athletes with a mean age of 21.5 year (17 female) volunteered to participate. The Short Form Big Five Inventory and the Schutte Self-Report Emotional Intelligence Test measured personality and trait EI, respectively. Electromyography (EMG) determined the MVC level of the triceps surae muscle group in the absence and presence of a stressor. The mental stressor was to count downwards, repeatedly subtracting 13 from a starting value of 1000.ResultsAthletes’ MVC values were positively associated with conscientiousness and trait EI regardless of the presence or absence of a mental stressor. Two hierarchical regressions were conducted to determine whether personality traits and trait EI could predict MVC values measured during the absence and presence of mental stressor. Results show that personality traits explain variability in MVC values measured in both the absence and the presence of a mental stressor. Further, trait EI increased the model's ability to predict MVC. Personality traits combined with trait EI had stronger predictive ability for MVC values during exposure to a mental stressor.ConclusionAthletes with higher levels of conscientiousness and trait EI may be able to tolerate more stress without a decrease in performance.     

Understanding the role of social capital in adolescents' Big Five personality effects on school-to-work transitions

The school-to-work transition constitutes a central developmental task for adolescents. The role of Big Five personality traits in this has received some scientific attention, but prior research has been inconsistent and paid little attention to mechanisms through which personality traits influence job-search outcomes. The current study proposed that the joint effects of Big Five personality traits and social capital (i.e., available resources through social relations) would shed more light on adolescents' job-search outcomes. Analyses on 685 Dutch vocational training graduates showed that extraversion and emotional stability were related to better job-search outcomes after graduation. Some relations between Big Five personality traits and job-search outcomes were explained by social capital, but no relations were dependent on social capital. Social capital had a direct relation with the number of job offers. Contrary to popular belief, this study shows that Big Five personality traits and social capital relate to job-search outcomes largely independently.     

Predicting white matter integrity from multiple common genetic variants

Several common genetic variants have recently been discovered that appear to influence white matter microstructure, as measured by diffusion tensor imaging (DTI). Each genetic variant explains only a small proportion of the variance in brain microstructure, so we set out to explore their combined effect on the white matter integrity of the corpus callosum. We measured six common candidate single-nucleotide polymorphisms (SNPs) in the COMT, NTRK1, BDNF, ErbB4, CLU, and HFE genes, and investigated their individual and aggregate effects on white matter structure in 395 healthy adult twins and siblings (age: 20-30 years). All subjects were scanned with 4-tesla 94-direction high angular resolution diffusion imaging. When combined using mixed-effects linear regression, a joint model based on five of the candidate SNPs (COMT, NTRK1, ErbB4, CLU, and HFE) explained ≈ 6% of the variance in the average fractional anisotropy (FA) of the corpus callosum. This predictive model had detectable effects on FA at 82% of the corpus callosum voxels, including the genu, body, and splenium. Predicting the brain's fiber microstructure from genotypes may ultimately help in early risk assessment, and eventually, in personalized treatment for neuropsychiatric disorders in which brain integrity and connectivity are affected.     

Negative emotionality: monoamine oxidase B gene variants modulate personality traits in healthy humans

Monoamine oxidase A and B (MAOA and MAOB) appear to be involved in the pathogenesis of Major Depression, and vulnerability of Major Depression is associated with personality traits relating to positive and negative affect. This study aimed to investigate associations between MAOA and MAOB polymorphisms and personality traits of positive and negative emotionality in healthy volunteers, to elucidate mechanisms underlying personality and the risk for depression. Healthy Caucasian volunteers (N = 150) completed the Multiphasic Personality Questionnaire (MPQ), which includes independent superfactors of Positive Emotionality and Negative Emotionality. Participants were genotyped for 8 MAOA and 12 MAOB single nucleotide polymorphisms (SNPs). Association analyses for both SNPs and haplotypes were performed using the permutation approach implemented in PLINK. Negative Emotionality was significantly associated with the two highly linked MAOB polymorphisms rs10521432 and rs6651806 (p < 0.002). Findings were extended in haplotype analyses. For MAOB the 4-SNP haplotype GACG formed from rs1799836, rs10521432, rs6651806 and rs590551 was significantly related to lower Negative Emotionality scores (p < 0.002). MAOA was not related to personality in this study. Our finding provides the first evidence that MAOB polymorphisms influence levels of negative emotionality in healthy human volunteers. If confirmed, these results could lead to a better understanding of personality traits and inter-individual susceptibility developing psychiatric disorders such as major depression.     

The relative contribution of common and rare genetic variants to ADHD

Attention deficit hyperactivity disorder (ADHD) is highly heritable. Genome-wide molecular studies show an increased burden of large, rare copy-number variants (CNVs) in children with ADHD compared with controls. Recent polygenic risk score analyses have also shown that en masse common variants are enriched in ADHD cases compared with population controls. The relationship between these common and rare variants has yet to be explored. In this study, we tested whether children with ADHD with (N=60) a large (>500 kb), rare (<1% frequency) CNV differ by polygenic risk scores for ADHD to children with ADHD without such CNVs (N=421). We also compared ADHD polygenic scores in ADHD children with and without CNVs with a group of population controls (N=4670; of whom N=397 had CNVs). The results show that children with ADHD with large, rare CNVs have lower polygenic scores than children without such CNVs (odds ratio (OR)=0.73, P=0.023). Although ADHD children without CNVs had higher scores than controls (OR=1.18, P=0.0031), this difference was not observed for ADHD children with CNVs (OR=0.86, P=0.27). These results are consistent with a polygenic liability threshold model of ADHD with both common and rare variants involved.     

Influences of parenting on normal personality traits

There is a considerable literature linking aspects of experienced parenting to later personality disorders. Because dimensionally measured personality disorders are associated with variations in normal personality traits, it is important to understand the contribution of parenting experienced in childhood to later normal personality traits. In this report, 742 community-based individuals, subjects from the Hopkins Epidemiology of Personality Disorders Study, were assessed for normal personality traits, as measured by the Revised NEO Personality Inventory (NEO-PI-R) and the Temperament and Character Inventory (TCI), and for parental behavior experienced as children, as measured by the Parental Bonding Instrument (PBI). The PBI dimensions were significantly, but moderately, correlate with measures of normal personality, the strongest associations being with the NEO-PI-R factors, neuroticism and conscientiousness, and with the TCI factors, self-directedness and harm avoidance. Subjects who reported lower parental care and higher parental intrusiveness were more likely to be higher in neuroticism, lower in conscientiousness, lower in self-directedness, and higher in harm avoidance. Also, trends emerged suggesting both parent-specific and gender-specific differences in the relationship between the PBI dimensions and normal adult personality traits. As variations in normal personality traits are associated with dimensionally measured personality disorders, it is conceivable that the role of parenting in later personality disorder may be mediated by associations between parenting and normal personality traits.     

Heritability estimates for psychotic disorders: the Maudsley twin psychosis series

BACKGROUND: Previous twin studies have supported a genetic contribution to the major categories of psychotic disorders, but few of these have employed operational diagnostic criteria, and no such study has been based on a sample that included the full range of functional psychotic disorders. METHODS: A total of 224 twin probands (106 monozygotic, 118 dizygotic) with a same-sex co-twin and a lifetime history of psychosis was ascertained from the service-based Maudsley Twin Register in London, England. Research Diagnostic Criteria psychotic diagnoses were made on a lifetime-ever basis. Main-lifetime diagnoses of DSM-III-R and International Statistical Classification of Diseases, 10th Revision schizophrenia were also made. Probandwise concordance rates and correlations in liability were calculated, and biometrical model fitting applied. RESULTS: A substantial genetic contribution to variance in liability was confirmed for the major diagnostic categories except Research Diagnostic Criteria depressive psychosis and unspecified functional psychosis, where familial transmission was confirmed, but the relative contribution of genetic and common environmental factors was unclear. Heritability estimates for Research Diagnostic Criteria schizophrenia, schizoaffective disorder, mania, DSM-III-R schizophrenia, and International Statistical Classification of Diseases, 10th Revision schizophrenia were all between 82% and 85%. None of the estimates differed significantly from any other. CONCLUSIONS: Heritability estimates for schizophrenia, schizoaffective disorder, and mania were substantial and similar. Population morbid risk estimates were inferred rather than directly measured, but the results were very similar to those from studies where morbid risks were directly estimated.     

Big Five personality traits may inform public health policy and preventive medicine: Evidence from a cross-sectional and a prospective longitudinal epidemiologic study in a Swiss community

BackgroundSome evidence documents the importance of personality assessments for health research and practise. However, no study has opted to test whether a short self-report personality inventory may comprehensively inform health policy.MethodsData were taken from a population-based epidemiologic survey in Zurich, Switzerland, conducted from 2010–2012. A short form of the Big Five Inventory was completed by n = 1155 participants (54.4% women; mean age = 29.6 years), while health-related outcomes were taken from a comprehensive semi-structured clinical interview. A convenience subsample averaging n = 171 participants additionally provided laboratory measures and n = 133 were subsequently followed-up at least once over a maximal period of 6 months.ResultsPersonality traits, in particular high neuroticism and low conscientiousness, related significantly to poor environmental resources such as low social support (R² = 0.071), health-impairing behaviours such as cannabis use (R² = 0.071), and psychopathology, including negative affect (R² = 0.269) and various mental disorders (R² = 0.060–0.195). The proportion of total variance explained was R² = 0.339 in persons with three or more mental disorders. Personality significantly related to some laboratory measures including total cholesterol (R² = 0.095) and C-Reactive Protein (R² = 0.062). Finally, personality prospectively predicted global psychopathological distress and vegetative symptoms over a 6-month observation period.ConclusionsPersonality relates consistently to poor socio-environmental resources, health-impairing behaviours and psychopathology. We also found some evidence for an association with metabolic and immune functions that are assumed to influence health. A short personality inventory could provide valuable information for preventive medicine when used as a means to screen entire populations for distinct risk exposure, in particular with respect to psychopathology.     

The dynamic relationship of parental personality traits with the personality and psychopathology traits of anorectic and bulimic daughters

Objective

Parenting and family dynamics influence the emergence, development, and maintenance of eating disorders (EDs). Although family interventions are relevant for therapeutic programs, knowledge of the relationship between parental personality traits and the eating psychopathology of daughters is scarce. This study explored the personality and psychopathology of women with EDs and correlated them with parental personality traits.

Method

The personality and eating psychopathology traits of 38 restricter anorectics, 30 bingeing/purging anorectics, 37 bulimics, and their parents' personality traits (87 fathers and 97 mothers) were measured with the Temperament and Character Inventory, the Clinical Global Impression Scale, the Eating Disorders Inventory-2, and the Beck Depression Inventory. The results were compared with matched controls (54 women, 50 fathers, 54 mothers). Personality and psychopathology were correlated with multiple regression.

Results

Women with ED displayed high harm avoidance and low self-directedness, whereas restricter anorectic women had high persistence. Low persistence was common in fathers of daughters across all EDs. Fathers of restricter anorectics were highly harm avoidant. Fathers of both anorectic subtypes and mothers of bulimic women displayed low self-directedness. Parental personality traits were linearly correlated with their daughter's personality and psychopathology, but the correlation differed among EDs.

Conclusion

Parents of eating-disordered participants displayed personality characteristics that differed from controls and, among ED subgroups, these differences were related to their daughter's personality and psychopathology. The linear correlation did not fully explain the relationship of the parental personality traits to the presence of their daughter's ED, suggesting that a more complex personality-based family dynamic is involved. A Temperament and Character Inventory profile of the entire family may be used in the planning of family treatment.     

The influences of family environment on personality traits

In order to clarify the influences of family environment on the development of personality traits, 150 children (104 males and 46 females, mean age 13.2 +/- 2.4 years) who had been interviewed at the Child Guidance Clinic in Osaka were investigated. From 13 behavioral characteristics (activity, talkativeness, sociability, social skills, rule-keeping, will, aggression, emotional control, imagination, anxiety, maturity, intelligence, and neuroticism), factor analysis identified three personality traits: extraversion, maturity, and intellect. The effects of family environment (maternal and paternal participation in child rearing before and after 4years of age, child-rearing style, parental relationship, sibling relationship, number of siblings, birth order, and socioeconomic status) on these personality traits were examined based on a structural equation model. The results found, first, that extraversion was negatively associated with overprotection/interference and with maternal participation in child rearing. Maturity correlated with high socioeconomic status, appropriate child-rearing style, and paternal participation in child rearing. Intellect was related to high socioeconomic status and maternal participation in child rearing. Second, path analysis with selected variables revealed that 8% of variance in extraversion, 14% in maturity, and 10% in intellect was due to family environment. Third, children with high introversion or high intellect had stronger influences from family environment than did those with high extraversion or low intellect.     

Compulsive buying disorder clustering based on sex,age, onset and personality traits

In spite of the revived interest in compulsive buying disorder (CBD), its classification into the contemporary nosologic systems continues to be debated, and scarce studies have addressed heterogeneity in the clinical phenotype through methodologies based on a person-centered approach.ObjectivesTo identify empirical clusters of CBD employing personality traits, as well as patients' sex, age and the age of CBD onset as indicators.MethodsAn agglomerative hierarchical clustering method defining a combination of the Schwarz Bayesian Information Criterion and log-likelihood was used.ResultsThree clusters were identified in a sample of n = 110 patients attending a specialized CBD unit a) “male compulsive buyers” reported the highest prevalence of comorbid gambling disorder and the lowest levels of reward dependence; b) “female low-dysfunctional” mainly included employed women, with the highest level of education, the oldest age of onset, the lowest scores in harm avoidance and the highest levels of persistence, self-directedness and cooperativeness; and c) “female highly-dysfunctional” with the youngest age of onset, the highest levels of comorbid psychopathology and harm avoidance, and the lowest score in self-directedness.ConclusionSociodemographic characteristics and personality traits can be used to determine CBD clusters which represent different clinical subtypes. These subtypes should be considered when developing assessment instruments, preventive programs and treatment interventions.     

Clinical assessment of pathological personality traits

OBJECTIVE: Research has raised questions about the ability of clinicians to make reliable diagnostic judgments about personality. The aim of this study was to assess the reliability and validity of the dimensional diagnosis of pathological personality traits with the Shedler-Westen Assessment Procedure-200 (SWAP-200) Q sort. METHOD: Two clinician/judges independently described 24 outpatients using the SWAP-200, based on a systematic clinical interview. Treating clinicians described the patients using the SWAP-200 based on their knowledge of the patients over the course of treatment while they were blind to interview data. RESULTS: Interrater reliability was high. Convergent and discriminant validity between interviewers and clinicians was also strong. A procedure recently developed for providing precise estimates of construct validity with contrast analysis applied to correlational data documented strong evidence of validity. CONCLUSIONS: Clinicians and independent interviewers can reliably assess complex personality traits associated with personality pathology using the SWAP-200.     

Influences of parental rearing on the personality traits of healthy Japanese

Influences of parental rearing on the personality traits of healthy subjects were studied in 323 Japanese volunteers. Perceived parental rearing was assessed with the use of the Parental Bonding Instrument, which consists of the factors of care and protection, whereas personality traits were assessed with the use of the Temperament and Character Inventory, which has 7 dimensions. In male subjects, all personality dimensions except for novelty seeking were influenced by parental rearing; in female subjects, only the harm avoidance (HA) and self-directedness (SD) dimensions were affected by parenting. Paternal rearing influenced 3 dimensions in male subjects and 1 dimension in female subjects, whereas maternal rearing influenced 5 dimensions in male subjects and 2 dimensions in female subjects. In male subjects, higher HA was related to higher paternal protection (P < .05), whereas in female subjects, it was related to higher maternal protection (P < .01). In male subjects, lower SD was related to higher paternal protection (P < .05) and lower maternal care (P < .01), whereas in female subjects, it was related to lower paternal care (P < .05) and higher maternal protection (P < .01). These results suggest that parental rearing influences the personality traits of healthy subjects, especially HA and SD, with sex specificity in parents and recipients.     

The impact of aversive personality traits on the psychotic-spectrum of disorders

ObjectivesThough relatively unexplored in clinical populations, aversive personality traits have been shown to impact the expression, the management, and the outcomes of psychotic disorders. This paper seeks to gather and organize existing evidence of the complex interplay linking social ethics, personality and experiences of psychosis through the lens of the so-called Dark Triad personality model, comprising the three multidimensional constructs Machiavellianism, narcissism and psychopathy.MethodsA semi-systematic review of major literature databases was conducted; search terms aimed at capturing each of the Dark Triad dimensions and their known relations with both clinical (with single-symptom approach) and non-clinical psychotic experiences.ResultsReviewed studies suggest that all the components of the Dark Triad model present significant clinical implications in the management of psychotic disorders.ConclusionsAversive personality traits interact with and modulate the experiences of psychosis. They can be shown to influence the clinical and functional outcomes of psychotic patients. Therefore, further research on this theme seems justified in that it may inform rehabilitative efforts.