The development of Addiction-Prone Personality traits in biological and adoptive families

This project investigated the predictors of Addiction-Prone Personality (APP) scores in youth and young adults from biological (N = 328, 53% female) and adoptive (N = 77, 53% female) families. The development of offspring’s APP traits was examined from three different angles: (1) patterns in biological and adoptive families, (2) offspring’s vs. parent’s perceptions of familial environment, and (3) different points in the life span. The offspring’s APP scores were found to be significantly predicted by parents’ APP scores in both biological and adoptive families. Parents’ APP scores and offspring’s gender consistently showed significant direct influences on offspring’s APP scores in biological families. The familial care factor (maternal and paternal care, family cohesion, and family adaptability) was found to be the consistent significant predictor of offspring’s APP scores in adoptive families even when offspring became older. These results are consistent in showing that the social environment plays an important role in the development of Addiction-Prone Personality traits.     

Personality traits change in adulthood: reply to Costa and McCrae (2006)

In a response to comments by P. T. Costa, Jr., and R. R. McCrae on the current authors' original article, the authors show that Costa and McCrae's writings on personality suggest a belief in immutability of personality traits. The authors agree with Costa and McCrae that new personality trait models that provide an accurate lower order structure of personality traits are needed and explain why the Revised NEO Personality Inventory is not the correct model for that purpose. The authors provide direct evidence refuting the hypothesis that personality traits change only because of biologically based intrinsic maturation. The authors present arguments supporting the contention that meta-analyses should be preferred to single longitudinal studies when drawing inferences about general patterns of personality development. Finally, the authors point out why the differences between their position and Costa and McCrae's are important.     

Personality characteristics and event related potentials (ERP)

Our investigation deals with high interindividual variability of Event-Related-Potentials (ERP). We tried to find out systematic causes of these variability. In a performance situation 36 Ss were asked to solve arithmetical tasks. They got a weak electric shock applied at one finger when the result was wrong (negative feedback), at another finger when it was correct (positive feedback). The electrical stimulus triggered the ERPs. Special personality characteristics related to "need-achievement" (processing of success and failure) "and anxiety" had influence upon ERPs. We found various differences between ERPs following positive as well as negative feedback (success and failure) that point to the suggestion that there exist differences in processing feedback information in persons with different personality traits mentioned above.     

Personality traits and affective states: Relationships with and without affect induction

Substantial evidence shows that extraversion is related to positive affect (PA) and neuroticism is related to negative affect (NA), and there are several possible explanations for these relationships. The current paper replicates these findings and examines relationships between the other Big Five traits with general positive and negative states (N = 257). Agreeableness was negatively related to NA, while conscientiousness and openness were positively related to PA. Next, affect was induced and extraversion and conscientiousness predicted changes in affect following an affect-induction (N = 262). The current findings support some theoretical understandings of broad personality traits and their relationships to general affect, and also suggests some refinements.     

Personality traits associated with seasonal disturbances in mood and behavior

It has recently been shown that those individuals who experience more profound seasonal disturbances in mood and behavior have increased levels of neurotic personality traits (Jang, Lam, Livesley, & Vernon, 1997; Kane & Lowis, 1999; Murray, Hay, & Armstrong, 1995). The present study however proposes that the development and nature of seasonal depressions may be better explained through consideration of the combined effects of neurotic and extraverted personality traits. Using the EPQ and the Seasonal Pattern Assessment Questionnaire, personality and levels of seasonal disturbance were measured in 77 adults (16 males and 61 females). As predicted, increased levels of neurotic personality traits were associated with more profound seasonal disturbances in mood and behavior but the degree of seasonal variation in mood and behavior was equally well explained in terms of “impulsivity” as reflecting the activity of the Behavioral Activation System. Overall, it is concluded that a more integrated approach to personality could be adopted to aid the understanding of seasonal depressions.     

Personality traits in eating-disordered patients with and without self-injurious behaviors

Although there is a high comorbidity of eating disorder and self-injurious behavior (SIB), no systematic research has focused on personality trait differences in patients with and without SIB. In this study, a Dutch adaptation of the NEO-FFI (Costa & McCrae, 1985, 1992) was completed by 178 female, eating-disordered (ED) patients of whom 46.5% showed at least 1 form of SIB (e.g., cutting, burning, hair pulling). A subsample of 41 patients also completed the NEO-PI-R. Compared to patients without SIB, ED patients with SIB scored significantly higher on the Neuroticism scale and significantly lower on the Extraversion scale; on subtraits (facet scores) they appeared to be more anxious, more willing to please and less cheerful, efficient and ambitious. Personality traits were not associated with frequency or form of SIB or subtype of ED (except for impulsiveness). We also did not find a significant interaction effect between ED subtype and presence/absence of SIB.     

Personality traits associated with seasonal disturbances in mood and behavior

It has recently been shown that those individuals who experience more profound seasonal disturbances in mood and behavior have increased levels of neurotic personality traits (Jang, Lam, Livesley, & Vernon, 1997; Kane & Lowis, 1999; Murray, Hay, & Armstrong, 1995). The present study however proposes that the development and nature of seasonal depressions may be better explained through consideration of the combined effects of neurotic and extraverted personality traits. Using the EPQ and the Seasonal Pattern Assessment Questionnaire, personality and levels of seasonal disturbance were measured in 77 adults (16 males and 61 females). As predicted, increased levels of neurotic personality traits were associated with more profound seasonal disturbances in mood and behavior but the degree of seasonal variation in mood and behavior was equally well explained in terms of “impulsivity” as reflecting the activity of the Behavioral Activation System. Overall, it is concluded that a more integrated approach to personality could be adopted to aid the understanding of seasonal depressions.     

Differences in personality characteristics between body-modified and non-modified individuals: associations with individual personality traits and their possible evolutionary implications

After a long history of negative stigmatisation, the practices of tattooing and body piercing have become fashionable in the last decade. Today, 10% of the population in modern western societies have some form of body modification. The aim of this study was to quantify the demographic and personality traits of tattooed and pierced individuals and to compare them with a control group of individuals without body modifications. These comparisons are based on questionnaires completed by 359 individuals that investigate the details of body modification, and which incorporate five personality scales. We describe several sex differences in ornament style and location. We found no relevant differences between modified and non-modified individuals in relation to demographic variables. This indicates that some of the traditional attitudes towards tattoos and piercings appear to be outdated. However, we found striking differences in personality traits which suggest that body-modified individuals are greater sensation seekers and follow a more unrestricted mating strategy than their non-modified contemporaries. We discuss these differences in light of a potential signalling function of tattoos and piercings in the mating context. Copyright © 2007 John Wiley & Sons, Ltd.     

Personality characteristics in primary benzodiazepine-dependent patients: Comparison with controls and polydrug users

The present study applied Karolinska Scales of Personality (KSP) to study (i) if patients with benzodiazepine dependence have a characteristic personality profile, (ii) if the personality characteristics in patients with benzodiazepine dependence differ from those of polydrug users and normal controls, (iii) if differences in treatment outcome existed between the groups, and (iv) if the possible difference in treatment outcome was associated with any particular personality characteristic shown by the patients. The personality characteristics of primary benzodiazepine dependent patients (BDZ) and a group of polydrug users (MIX) were studied initially (during the first week in project as an inpatient) and approximately one year after drug discontinuation, and a comparison was made with healthy controls on both test occasions. The results showed that the personality of both groups of patients differed significantly from the Controls in the following characteristics: Detachment, Socialization, Somatic Anxiety, Muscular Tension, Psychic Anxiety, and Psychasthenia. Significant differences existed between the polydrug and benzodiazepine users in Somatic and Psychic Anxiety as well as in Socialization. The MIX group differed significantly from the BDZ group and from the Controls in Suspicion. Results of treatment outcome indicated that the benzodiazepine dependent patients were significantly more successful in quitting their drug use compared to polydrug users. Further, the results demonstrated that patients scoring high in the investigated personality characteristics are those who fail the treatment goal of quitting their drug use, especially the patients with a high level of anxiety and detachment.     

Still cautious: Personality characteristics of extremely low birth weight adults in their early 30s

Extremely low birth weight survivors (ELBW; <1000 g) display a personality style characterized by cautiousness, shyness, and risk aversion in their 20s. We examined whether non-impaired ELBW survivors were still more cautious than their normal birth weight (NBW) peers at ages 30–35 and assessed the stability of this personality characteristic across approximately a decade in the oldest known cohort of ELBW survivors. Of the 154 participants tested at ages 22–26, 111 (i.e., 72%) of them returned approximately 10 years later [i.e., 69% (49/71) ELBW and 75% (62/83) NBW], and once again they completed the Eysenck Personality Questionnaire-Revised (EPQ-R). We created the same theoretically and empirically derived composite measure of cautiousness at each visit by summing the EPQ-R psychoticism scale (reverse scored) and the EPQ-R lie scale. We found that ELBW adults reported higher cautiousness than their NBW counterparts at ages 30–35. We also found that levels of cautiousness remained stable over approximately 10 years in both groups. Our findings suggest that individuals born at ELBW were more cautious than NBW peers and that this personality characteristic remained stable into their early 30s. The present study appears to be the first empirical demonstration of personality stability among adult ELBW survivors.     

Personality traits in old age: measurement and rank-order stability and some mean-level change

Lothian Birth Cohorts, 1936 and 1921 were used to study the longitudinal comparability of Five-Factor Model (McCrae & John, 1992) personality traits from ages 69 to 72 years and from ages 81 to 87 years, and cross-cohort comparability between ages 69 and 81 years. Personality was measured using the 50-item International Personality Item Pool (Goldberg, 1999). Satisfactory measurement invariance was established across time and cohorts. High rank-order stability was observed in both cohorts. Almost no mean-level change was observed in the younger cohort, whereas Extraversion, Agreeableness, Conscientiousness, and Intellect declined significantly in the older cohort. The older cohort scored higher on Agreeableness and Conscientiousness. In these cohorts, individual differences in personality traits continued to be stable even in very old age, mean-level changes accelerated.     

Personality traits of the behavioural approach and inhibition systems: associations with processing of emotional stimuli

This study examined the relationships of the traits associated with Gray's behavioural approach system (BAS) and behavioural inhibition system (BIS) with cognitive processing of emotional information. Initially, participants completed questionnaires covering trait impulsivity and anxiety, and BAS and BIS sensitivities. They were then tested individually. After completing a questionnaire of current positive and negative moods, they completed three tasks measuring processing of pleasant, unpleasant and neutral information. Consistent with Gray’s theory, the results showed that impulsivity and BAS sensitivity were associated with the processing of pleasant information, while anxiety and BIS sensitivity were associated with the processing of unpleasant information. These findings imply that Gray’s BAS–BIS theory can be extended to cognitive processing of emotional information.     

Dispositional traits and internal migration: Personality as a predictor of migration in Australia

This study analyses a large longitudinal panel dataset (HILDA, or the Household Income and Labour Dynamics in Australia) to assess the extent to which personality traits predict four constructs pertaining to the migration decision: intention to migrate, certainty around intention, migration outcomes, and the strength of association between migration intention and subsequent migration outcomes. Results show small but significant effects of Extraversion and Openness on both migration and intention to migrate. Openness negatively predicted certainty around intention, and Conscientiousness related to the extent to which migration intentions align with outcomes for those who did migrate, while Extraversion predicted migration events among those without a prior intention to migrate.     

Callous-unemotional and borderline traits in nonclinical adolescents: Personality profiles and relations to antisocial behaviors

Callous-unemotional and borderline traits, antisocial behaviors, depressive symptoms and social anxiety were assessed in 972 high-school students. Cluster analysis yielded four groups: a low traits group, a second group that was above the mean in callous-unemotional traits and below the mean in borderline traits (moderate callous-unemotional traits cluster), a third group that was well above the mean in borderline traits but low on callous-unemotional traits (borderline traits cluster), and a fourth group that was high on both traits (high traits cluster). The high traits cluster was characterized by the highest level of antisocial behaviors and shared with the borderline traits cluster a high level of depressive symptoms and social anxiety. The moderate callous-unemotional traits cluster and the borderline traits cluster had similar levels of antisocial behaviors that were higher than those of the low traits cluster. This study suggests that there is a significant minority of non-clinical adolescents characterized by the presence of both callous-unemotional and borderline traits, and higher levels of antisocial behaviors and emotional distress.