Temperament And Character Inventory Subscales Research Articles

TEMPERAMENT AND CHARACTER TRAITS IN PATIENTS WITH OBSESSIVE-COMPULSIVE DISORDER.

Personality is an essential variable in order to understand the course of Obsessive-Compulsive Disorder (OCD). Among the studies investigating the relationship between OCD and personality traits, the most common finding is that individuals diagnosed with OCD was reported to have higher levels of Harm Avoidance (HA) trait compared to healthy controls. In addition, OCD group was found to have lower scores regarding Self- Directedness (SD), Cooperativeness (C) or Novelty Seeking (NS). The patient group of the study consisted of patients were diagnosed with OCD by SCID-I scanning. The healthy control group had similar age, gender, and educational level characteristics as the patient group. The patients and the control group were asked to fill out a Sociodemographic Data Form, Temperament and Character Inventory (TCI), Beck Depression and Beck Anxiety Scales. For the patient group, Yale-Brown Obsessive-Compulsive Scale, and Yale-Brown Symptom Checklist were filled out by the clinician who conducted the psychiatric interview. Patients with OCD (n=70) were characterized by higher HA (p<0.001) scores and lower C (p=0.034), and SD (p<0.001) scores than the healthy control group (n=65). When comparing pure OCD patients (n=23) with the healthy control group, their HA scores were higher and the self-transcendence (ST) scores were lower. Compared to the healthy control group, OCD patients with psychiatric comorbidity (n=47) had a higher HA score and a lower SD score. Comorbid OCD patients' SD scores were lower and ST scores were higher compared to the patients with Pure OCD. No significant relationship was found between OCD severity and TCI subscales. Our findings indicate the importance of considering the presence of comorbid psychiatric diagnoses for the evaluation of personality dimensions in OCD patients. The assessment of temperament and character traits in OCD may provide clinical benefit in terms of predicting the prognosis and planning appropriate psychotherapeutic interventions.

Effects of personality on the developmental trajectories of academic burnout among Korean medical students.

BackgroundMedical students have a high risk of burnout from tremendous academic stress, and previous cross-sectional studies have explained this risk from the personality perspective. However, the relationship between complex personality profiles and developmental trajectory of burnout has not been delineated yet.MethodsThe longitudinal changes in burnout were measured by the Maslach Burnout Inventory-Student Survey (MBI-SS) at baseline (1st week), mid-term (9th week), and end-term (17th week), and personality was examined at baseline using the Temperament and Character Inventory (TCI). Latent trajectory groups based on the MBI-SS total scores were extracted using the General Growth Mixture Model (GGMM), and significant differences in personality profiles among the latent groups were identified using profile analysis and Analysis of Variance.ResultsThree burnout trajectory groups of high-increasing (HI), moderate-increasing (MI), and low-stable (LS) were identified, and these groups had significantly different TCI subscale profiles. The HI group had the highest score in Harm-Avoidance (HA) and lowest score in Self-Directedness (SD), and the MI group had a higher score in HA and lower scores in SD and Cooperativeness (CO) when compared to the LS group with the lowest score in HA and highest scores in SD and CO.ConclusionThe current study showed that the HA, SD, and CO subscales of the TCI might explain the longitudinal development of academic burnout in medical students. Prevention of burnout and promotion of well-being in medical education concerning personality are discussed.

The Yin-Yang personality from biopsychological perspective using revised Sasang Personality Questionnaire

BackgroundThe biopsychological, pathological and physical characteristics of Yin-Yang (Eum-Yang in Korean) have been suggested using Sasang Personality Questionnaire (SPQ), however, the revision of SPQ is required for escalating its clinical use and multidimensional study on Yin-Yang. Methods274 university students were recruited to complete the SPQ, candidate items of revised SPQ (rSPQ) along with the Temperament and Character Inventory (TCI). After selecting rSPQ items using Item Analysis and Explorative Factor Analysis, its psychometric property was examined using Confirmatory Factor Analysis, Pearson’s correlation and t-test. The biopsychological features of Yin and Yang personality groups based on rSPQ total score were illustrated with the TCI using ANOVA and Profile Analysis. ResultsThe behavior, cognition and emotion subscales of 15-item rSPQ had robust psychometric construct and showed distinctive psychological characteristics of Yin-Yang. The rSPQ-total score was correlated positively with SPQ-total (r = 0.644, p < 0.01) and TCI Novelty-Seeking (r = 0.398, p < 0.01), and negatively with TCI Harm-Avoidance (r = −0.364, p < 0.01). And, the Yin personality group (34.45 ± 10.36 and 46.82 ± 12.27) has significantly different scores in Novelty-Seeking and Harm-Avoidance compared to Yang personality group (43.2 ± 9.1 and 36.53 ± 10.78). Yin and Yang personality groups showed distinctive TCI subscale profiles as shown in previous studies. ConclusionThe current study showed the organized subscale structure and clinical validity of rSPQ for Yin-Yang personality, and it would provide foundation for East-West cross-cultural psychology and integrative medicine.

M65. INTERPLAY OF TRAIT RESILIENCE WITH NEUROCOGNITIVE FUNCTIONING AND PERSONALITY CHARACTERISTICS IN YOUNG PEOPLE WITH PUTATIVE ‘AT RISK MENTAL STATE’

BackgroundIn the last decades psychological resilience has been increasingly recognized as a relevant area of research and clinical intervention in mental health. However, in the field of “at risk mental states” this topic remains underexplored. Limited studies involving individuals with ‘at risk mental state’ have demonstrated that they have lower levels of resilience than healthy controls, and that baseline resilience is lower among those who convert to frank psychosis than among those who do not. What is more, at risk individuals are characterized by a wide range of cognitive impairments, including general intelligence, executive function, verbal and visual memory, verbal fluency, attention, working memory, processing speed and social cognition. Recently, it has also been shown that a great majority of at-risk individuals have personality disorders, mainly depressive, borderline or schizotypal type.MethodsNinety-three young adults were administered a neurocognitive battery assessing attention, processing speed, verbal learning, working memory and verbal fluency along with Cloninger’s Temperament and Character Inventory (TCI), a self-report measure of psychological resilience (CD-RISC 10) and a semi-structured interview assessing at-risk mental state (CAARMS). We performed a two-step regression analysis. In the first model the results of cognitive tests were included as predictors of resilience, in the second model we added personality and temperamental traits to the significant cognitive predictors from the first model.ResultsThe first model demonstrated that verbal fluency (b*=0.25, p=0.033), digit coding score (b*=-0.27, p=0.039), TMT version B performance time (b*=-0.33, p<0.005), and D2 test total score (b*=-0.32, p<0.005) were all significant predictors of resilience. In the second model all of them except for D2 test total score, remain significant along with Self-directedness (b*=0.33, p<0.001) and Reward dependence (b*=0.22, p=0.022) subscales of TCI. What is more, resilience has proven to be a predictor of the positive symptoms subscale in CAARMS (b=-0.21, p=0,047).DiscussionThe obtained results indicate that resilience is associated with both neurocognitive functioning and personality traits, although significant standardized beta scores are not high (they range from 0.21 to 0.33) in this sample. Generally, they are consistent with previous findings that more resilient people are more ‘cognitively dexterous’ than those who are more prone to stress and adversity. However, an interesting findings of our study is the negative beta coefficients for digit symbol coding and D2 total score with resilience, which suggests that more resilient individuals do not necessarily “do their best” on cognitive testing. The result can also be examined from the point of view of the relationship between resilience and reward dependence demonstrated in this study. Perhaps the more resilient participants were aware that they would receive a reward (cash voucher) for participating in the study anyway, so they were not motivated enough to complete the task at their utmost. Nontheless, these results stimulate the reflection on the definition of resilience that still remain equivocal and polysemic.

Temperament and character profiles of patients with chronic idiopathic urticaria.

IntroductionPsychosocial factors have been implicated as being important in the onset and/or exacerbation of urticaria.AimTo examine both personality factors of patients with chronic idiopathic urticaria (CIU) and the correlations between illness duration, severity of itching, urticaria activity score (UAS) and temperament-character dimensions.Material and methodsA total number of 70 CIU patients and 60 healthy individuals were included in the study. The Temperament and Character Inventory (TCI) was administered individually. The relationship between UAS, illness duration and severity of pruritus and TCI subscales were evaluated.ResultsThe CIU group had significantly higher scores of novelty seeking and lower scores of cooperativeness, reward dependence and self-directedness than the control group.ConclusionsThe current study shows that CIU patients have distinctive temperament and character dimensions when compared with the control group. We suggest that evaluation and treatment of CIU should also include psychosomatic approaches in clinical practice.

Study on the Psychobiological Characteristics of Sasang Typology Based on the Type-Specific Pathophysiological Digestive Symptom

The purpose of this study was to analyze the psychobiological traits of each Sasang typology based on the Sasang Digestive function Inventory (SDFI) which measures the Sasang type-specific pathophysiological digestive symptom. The SDFI, Temperament and Character Inventory (TCI) and NEO-Personality Inventory (NEOPI) were measured with 199 College students. The correlation coefficient was measured with Pearson correlation among SDFI, TCI, and NEOPI. The influence of TCI, sex and age on SDFI and its subscales were analyzed with regression analysis. We also compared the psychobiological features between high and low SDFI score groups to elucidate its psychobiological profiles. There was significant correlation between SDFI and TCI Harm-Avoidance (r=-0.192, p<0.001). The SDFI subscales were showed to have significant correlations with subscales of NEOPI and TCI. The regression model with TCI can explain 8-16% of type-specific pathophysiological digestive symptoms. The low SDFI score group (39±9.3) has significantly (p=0.007) higher than the high SDFI group (33.6±12.2) in TCI Harm-Avoidance which is considered important for the gastrointestinal dysfunction and So-Eum type differentiation. We found that the TCI may explain the mechanism underneath the Sasang type-specific pathophysiological symptom. It was suggested that the TCI Reward-Dependence would be useful for the study on Tae-Eum Sasang type, and its clinical meanings were discussed in the pathophysiological perspectives. 

Temperament and character profiles of Japanese university student suicide completers

ObjectiveThe aims of this study were to investigate the personality traits of suicide completers using the Temperament and Character Inventory (TCI) scale. MethodsNewly enrolled students who enrolled at Hokkaido University in 1999–2002 and 2004–2007 completed the TCI. Among these students, twenty subjects (2 females and 18 males) later completed suicide. We compared the TCI scales of these subjects with those of 60 (6 females and 54 males) well-matched controls. The controls were matched for age, gender, university department and year of enrollment in the university. Because the number of females was too small, the statistical analyses for the TCI subscales and logistic regression analysis were performed only with the 18 males. ResultsA univariate analysis of seven personality dimensions on the TCI revealed higher scores of harm avoidance (HA) in subjects with suicide completion (P=0.034). Analysis of the male subjects showed that suicide completers had higher scores for anticipatory worry (HA1, P=0.007) and fear of uncertainty (HA2, P=0.036) and lower scores for spiritual acceptance (ST3, P=0.038) than did the controls. A multivariate analysis, which was performed to adjust confounding factors, demonstrated significantly higher scores for HA1 among suicide completers (P=0.01, OR=1.32). ConclusionsThese results suggest that higher HA scores may predict suicide completion.

On the relationship between autistic traits and executive functioning in a non-clinical Dutch student population

We examined the association between autistic traits and different aspects of executive functioning (EF), using non-clinical Social Science and Science students as participants. Autistic traits, and associated personality traits, were measured using the Autism Quotient (AQ) and the Temperament and Character Inventory (TCI), respectively. EF was examined by means of a random number generation test and a phonemic fluency test. Using appropriate dependent measures, the following EF components were examined: 1) inhibition of prepotent responding, 2) simple output inhibition, 3) working memory monitoring and updating, and 4) switching. No significant relationship was found between the AQ and each of the four components of EF. However, two TCI subscales were reliably correlated with either the working memory or the shifting component. These results were discussed in view of the concept of an autism spectrum with respect to executive abilities.

Effects of Temperament and Character Profiles on State and Trait Depression and Anxiety: A Prospective Study of a Japanese Youth Population

Objective. To examine the effects of temperament and character profiles on state and trait depression and anxiety in a Japanese youth population. Method. Japanese university students were solicited for participation in a two-wave study, with assessments performed at Time 1 (T1) and Time 2 (T2), separated by a five-month interval. A total of 184 students completed the Japanese version of the temperament and character inventory (TCI) at T1 and the Hospital Anxiety and Depression Scale (HADS) at T1 and T2. We posited two latent variables, trait depression and anxiety, composed of the T1 and T2 HADS depression and anxiety scores, respectively. We also posited that temperament domain traits would predict character domain traits, and that all the personality traits would be linked to trait depression and anxiety and also predict T2 depression and anxiety. Results. Structural regression modeling showed that (1) only high Novelty Seeking predicted T2 Anxiety score, (2) trait depression and anxiety were linked to high harm avoidance and low self-directedness, and (3) trait depression was linked to high self-transcendence whereas trait anxiety was linked to low reward dependence, persistence, and cooperativeness. Conclusion. The characteristic associations between TCI subscales and depression and anxiety were limited to the trait rather than state aspects of depression and anxiety.

Convergent/Divergent Validity of the Brief Multidimensional Measure of Religiousness/Spirituality: Empirical Support for Emotional Connectedness as a “Spiritual” Construct

The objective of this article is to determine the convergent/divergent validity of the Brief Multidimensional Measure of Religiousness/Spirituality (BMMRS; Fetzer Institute & National Institute on Aging Working Group 1999) subscales by correlating it with the Temperament and Character Inventory (TCI) Self-Transcendence subscales (i.e., Mysticism, Transpersonal Identification, Self-Forgetfulness; Cloninger et al. 1994). The cross-sectional analysis of 97 undergraduate/graduate students from a Midwestern university was made. The results are (1) all five BMMRS spirituality subscales were significantly correlated with the TCI Mysticism scale; (2) two BMMRS scales (i.e., Daily Spiritual Experiences, Values/Beliefs) were significantly correlated with the TCI Transpersonal Identification scales; (3) no BMMRS spiritual subscales were significantly correlated with the TCI Self-Forgetfulness scale; and (4) of the BMMRS religion scales, only the Organizational Religiousness subscale was correlated with any TCI subscale (i.e., Mysticism). The BMMRS appears to have adequate convergent/divergent validity, although the need exists to determine specific dimensions of spirituality. Inspection of the specific items of the BMMRS and TCI spiritual subscales that were most consistently correlated (i.e., BMMRS Daily Spiritual Experiences, Values/Beliefs; TCI Mysticism, Transpersonal Identification) suggests the existence of a distinct spiritual construct that is best conceptualized as the experience of emotional connectedness to the divine, nature, and/or others.

Relationship of alexithymia and temperament and character dimensions with lifetime post‐traumatic stress disorder in male alcohol‐dependent inpatients

The purpose of the present study was to evaluate the prevalence of lifetime post-traumatic stress disorder (PTSD) in male alcohol-dependent inpatients and to investigate the relationship of PTSD with alexithymia and temperament and character dimensions. Participants were 156 consecutively admitted male alcohol-dependent subjects. Patients were investigated using the Clinician-Administered PTSD Scale (CAPS), the Toronto Alexithymia Scale (TAS-20) and the Temperament and Character Inventory (TCI). Among alcohol-dependent inpatients 32.1% were considered as having lifetime PTSD. Mean scores of alexithymia, novelty seeking (NS), harm avoidance (HA) and self-transcendence (ST) were higher in the PTSD group, whereas age and self-directedness (S) were lower. Among age and other factors of TAS-20, 'difficulty in identifying feelings (DIF)' predicted PTSD in a logistic regression model. When age and personality dimensions of TCI were taken as independent variables, S predicted PTSD in the logistic regression model. Finally, among subscales of TCI, 'impulsiveness versus reflection' (NS2) and 'congruent second nature versus bad habits' (S5) predicted PTSD. Alexithymia and personality traits, particularly high DIF and S scores are related with lifetime PTSD diagnosis, even when controlling for age among alcohol-dependent inpatients. Causal relationships between alexithymia, personality dimensions and PTSD, and their implications on treatment are not clear and should be evaluated in longitudinal studies.

Interaction between serotonin 5-HT2A receptor gene and dopamine transporter (DAT1) gene polymorphisms influences personality trait of persistence in Austrian Caucasians

We examined 89 normal volunteers using Cloninger's Temperament and Character Inventory (TCI). Genotyping the 102T/C polymorphism of the serotonin 5HT2A receptor gene and the ser9gly polymorphism in exon 1 of the dopamine D3 receptor (DRD3) gene was performed using PCR-RFLP, whereas the dopamine transporter (DAT1) gene variable number of tandem repeats (VNTR) polymorphism was investigated using PCR amplification followed by electrophoresis in an 8% acrylamide gel with a set of size markers. We found a nominally significant association between gender and harm avoidance (P=0.017; women showing higher scores). There was no association of either DAT1, DRD3 or 5HT2A alleles or genotypes with any dimension of the TCI applying Kruskal–Wallis rank-sum tests. Comparing homozygote and heterozygote DAT1 genotypes, we found higher novelty seeking scores in homozygotes (P=0.054). We further found a nominally significant interaction between DAT1 and 5HT2A homo-/heterozygous gene variants (P=0.0071; DAT1 and 5HT2A genotypes P value of 0.05), performing multivariate analysis of variance (MANOVA). Examining the temperamental TCI subscales, this interaction was associated with persistence (genotypes: P=0.004; homo-/heterozygous gene variants: P=0.0004). We conclude that an interaction between DAT1 and 5HT2A genes might influence the temperamental personality trait persistence.

Temperament and character in subjects with obsessive-compulsive disorder

Background The aims of this study were to evaluate the differences between personality traits of patients with obsessive-compulsive disorder (OCD) and normal controls using the Temperament and Character Inventory (TCI) and to examine the relationship of personality traits and the severity of obsessive-compulsive (OC) symptoms. We also aimed to examine the influence a particular personality trait might have on the 5 factor-analyzed symptom dimension scores of OCD. Method We recruited 130 patients with OCD and 185 age- and sex-matched normal controls. All subjects completed the TCI. Patients with OCD were assessed with the Yale-Brown Obsessive-Compulsive Scale (Y-BOCS), the Hamilton Depression Rating Scale, and the factor-analyzed symptom dimension scores from the Y-BOCS checklist. Results Patients with OCD had higher harm avoidance scores and lower self-directedness (SD), reward dependence (RD), and cooperativeness (C) scores than the controls. Lower SD scores and lower C scores were associated with OC symptom severity measured by the Y-BOCS after adjusting for age and depression severity. Hoarding dimension of OC symptoms was associated with lower SD scores and higher persistence (P) scores after adjusting for age, OC symptom severity, and depression severity. Conclusions There were significant differences in TCI subscales between patients with OCD and controls. Particular personality traits may have an influence on the severity and the dimensions of OC symptoms.

Association between monoamine oxidase A (MAOA) and personality traits in Japanese individuals

It has been reported that personality traits are related to several neurotransmitters. However, the association between personality traits and the central nervous system remains unclear. In the present study, we investigated the relationships between a polymorphism involving a variable number of tandem repeats in the promoter of the monoamine oxidase A ( MAOA-VNTR) gene and personality traits, as assessed by the Temperament and Character Inventory (TCI). Promoter VNTRs in the MAOA were genotyped in 558 healthy Japanese individuals. Females homozygous for high-activity allele (4/4) had significantly higher persistence scores than those homozygous for the low-activity allele (3/3) ( p = 0.012, ANOVA). Meanwhile no difference in persistence was found between 3 and 4 allele in males. There were no differences between other scores of TCI subscales and MAOA-VNTR polymorphism. Our results suggest a gender-specific contribution of MAOA-VNTR polymorphism to persistence scores.

An association study of catechol- O-methyltransferase and monoamine oxidase A polymorphisms and personality traits in Koreans

Catechol- O-methyltransferase (COMT) and monoamine oxidase A (MAOA) are both involved in the degradation of various biogenic amines which have been hypothesized to have a relationship with personality traits. The present study investigated the possible relationships between the genotypes of COMT Val158Met and MAOA-uVNTR polymorphisms and personality traits measured by the Temperament and Character Inventory (TCI). We recruited 286 normal, unrelated Korean subjects (138 males and 148 females). There were no associations between the COMT Val158Met genotypes or the TCI subscales in the male subjects. However, a significant correlation was observed between the COMT genotype and harm avoidance (HA, F = 6.0, p = 0.003) in females. Post hoc analyses showed that the subjects with the Met/Met genotype had the lowest mean HA (HA = 13.8 ± 5.7, p = 0.02), Val/Met group had an intermediate mean HA score (HA = 16.3 ± 7.0, p = 0.02), and Val/Val group had the highest mean HA value (HA = 19.6 ± 7.0, p = 0.02). There were no associations between the MAOA-uVNTR and the TCI subscales in either the male or female subjects. These results suggest that genetic variants of the COMT Val158Met gene may play a role in HA in Korean females but not in males.

An interaction between the serotonin transporter promoter region and dopamine transporter polymorphisms contributes to harm avoidance and reward dependence traits in normal healthy subjects

There is evidence for an association between polymorphisms of serotonin- and dopamine-related genes and temperamental personality traits. Recent findings have shown that interactions between allelic variants of the different genes may contribute to personality traits. We examined the effects of serotonin transporter-linked promoter region (5-HTTLPR) and dopamine transporter (DAT1) gene polymorphisms for associations with the Temperament and Character Inventory (TCI) temperament subscales in 209 Koreans. We found that the variants of 5-HTTLPR interacted with the DAT1 gene polymorphism to influence the HA and RD temperament subscales of TCI. Neither of these two genes affected any subscales of TCI alone.Controlling for the effects of gender and age, we found significant interactions between 5-HTTLPR and DAT1 genes on Harm Avoidance (HA) and Reward Dependence (RD) as measured by the TCI (Hotelling's Trace = 3.0, P = 0.02). In the presence of the DAT1 10/10 genotype, subjects of group L of 5-HTTLPR had a significantly higher HA score and significantly lower RD score than those of group S (F = 5.04, df = 1, p = 0.03 and F = 8.35, df = 1, p = 0.004, respectively). These findings suggest that the variants of 5-HTTLPR interacted with the DAT1 gene polymorphism to influence the HA and RD temperament subscales of TCI.

Self-mutilation in substance-dependent patients and relationship with childhood abuse and neglect, alexithymia and temperament and character dimensions of personality

Objective: Aim of this study was to evaluate the prevalence of self-mutilation (SM) in Turkish male substance-dependent patients, and to investigate the relationship of SM with childhood abuse and neglect, alexithymia and temperament and character dimensions of personality. Methods: Participants were 136 consecutively admitted males with substance dependence (96 alcohol and 40 drug). Substance dependence was diagnosed by means of the Structured Clinical Interview for DSM-IV (SCID-I), Turkish version. Patients were investigated with the childhood abuse and neglect questionnaire, Toronto alexithymia scale (TAS-20) and temperament and character inventory (TCI). Results: Among substance-dependent patients 34.6% was considered as a group with SM. Rates of being single and unemployed, histories of physical and sexual abuse and suicide attempts were higher in the SM group. Current age, age at first substance use and age at regular substance use were lower in the group with SM. Mean of TAS-20 and ‘difficulty in identifying feelings’ (DIF) and ‘difficulty in describing feelings’ (DDF) subscales of TAS-20 were higher in SM group. There were no significant differences between groups in terms of TCI subscales. Age, childhood physical abuse and suicide attempt history predicted SM in logistic regression. Conclusions: Young substance users with childhood physical abuse histories could be the target population to prevent self-mutilating behavior. This study also suggests that whenever self-mutilating behavior is present, the possibility of childhood abuse, alexithymia and suicide attempts must be evaluated.

Alexithymia correlates with the size of the right anterior cingulate.

The authors investigated a possible relationship between interindividual variability in anterior cingulate gyrus (ACG) morphology and alexithymia. Magnetic resonance images were obtained in 100 healthy university graduates (51 female, 49 male; mean age 25.6 y). Surface area measurements of the ACG were performed on reformatted sagittal views in both hemispheres. The Toronto Alexithymia Scale (TAS-20) and the Temperament and Character Inventory (TCI) were administered. Right ACG surface area significantly correlated with TAS-20 total score in men (r = 0.37; p = 0.009) and in women (r = 0.30; p = 0.034). After controlling for three TCI subscales (harm avoidance, self-directedness, and self-transcendency), the correlation between TAS-20 total and right ACG became nonsignificant in women, but was only slightly reduced (r = 0.32; p = 0.032) in men. A linear regression model with right ACG as a dependent variable revealed brain volume, TCI-harm avoidance and TAS 20 total score as significant predictors in the total sample (explained proportion of total variation (EPTV) 37%). In men, beside brain volume, only TAS-20 total score showed a highly significant contribution (EPTV 41%), whereas in women only TCI-harm avoidance was a significant predictor (EPTV 36%). The authors' findings indicate that there is a significant positive relation between the size of the right ACG and alexithymia as measured with the TAS in healthy subjects. This applies especially for men whereas in women ACG size is more associated with the subscale harm avoidance of the TCI. Our findings also suggest a partial lateralization of human emotion processing, especially negative emotion.

Serotonergic genes and personality traits in the Korean population

Serotonergic genes have been implicated in mood disorders, alcoholism and certain personality traits. The goal of this study was to investigate the relationship between personality traits and several important genes in the serotonin system. The participants included 146 healthy adults with no history of psychiatric disorders or other physical illness during the last 6 months. All participants were tested by the Temperament and Character Inventory (TCI) and genotyped serotonin transporter, serotonin receptors (5-HT 2A and 5-HT 6) and tryptophan hydroxylase gene polymorphisms. Genotyping was analyzed with polymerase chain reaction. Differences in TCI dimensions and sub-scales among three groups were examined with ANOVA. Our result suggested that 5-HT 2A receptor gene polymorphism (A-1438G) appears to be associated with self-determinism and self-transcendence (ST). Our result also indicated a significant relationship between 5-HT 6 receptor gene polymorphism (C267T) and ST. Further studies of polymorphisms of other genes and their interactions may clarify the complex relationship between personality and genes.

Alexithymia and the Temperament and Character Model of Personality

Objective: In our study we explored the associations between alexithymia (Toronto Alexithymia Scale 20, TAS-20) and the dimensions and subscales of Cloninger’s theoretically based and empirically validated psychobiological model of personality to further clarify the relationship between alexithymia and personality traits. Methods: Psychiatric in- and outpatients (n = 254) were investigated with the TAS-20, the Temperament and Character Inventory (TCI) and the Symptom Check List SCL-90-R to control for the severity of current psychopathology. Correlation and regression analyses were performed. Results: The regression analysis identified the TCI dimensions low self-directedness (SD), low reward dependence (RD) and to a minor degree harm avoidance (HA) as independent predictors for alexithymia. At the level of subscales, interpersonal detachment (RD3), low resourcefulness (SD3), low responsibility and blaming (SD1) and shyness with strangers (HA3) were predictors for alexithymia. The degree of explained variance of the TAS-20 scores by the TCI dimensions and subscales ranged between 43 and 45% whereas the inclusion of the general severity index into the regression models accounted for an additional 5% of the variance. Conclusions: Alexithymia is best explained by a mixture across different dimensions and subscales within Cloninger’s psychobiological model of personality. However, alexithymia is captured only partly by current concepts of personality, and additional contributing psychological and biological factors need to be identified to understand alexithymia more extensively.