Aim and Background: High prevalence of borderline personality disorder and its harmful social, health and economic consequences highlights the importance of studying this disorder and its underlying factors. The present study aimed to investigating Behavioral-brain systems of individuals with borderline disorder and its discriminative aspects of these systems in patients and healthy controls.Methods and Materials: Thus 30 patients who admitted to Razi Hospital (Tabriz, Iran), completed the Behavioral inhibition system (BIS), Behavioral activation system (BAS) questionnaire by Carver and White (BIS/BAS scales). Control group consisted of 30 subjects without any mental disorder history.Findings: Results from multi-variant regression analysis showed that the two groups had statistically significant differences in BAS, BIS and sensation seeking scale (P<0.01). Among these factors, sensation seeking scale with Wilks’ lambda=0.42 and BAS with Wilks’ lambda=0.53 had statistically significant role in discrimination between the two groups.Conclusions: Hyperactivity of BIS caused a permanent anxiety and negative emotions experienced by borderline patients and hyperactivity of BAS could be the underlying reason of impulsivity, which is the core component of borderline personality disorder. According to other studies in the field of bio-neural factors effects in development of borderline personality disorder, this study can help to improve our understanding of disorder and therefore help to improve developing accurate methods to predict the possibility of disorder. In addition, it will help us to develop methods for primary prevention and developing more effective therapy methods.

The research purpose is to investigate the relationship between Behavioral activation system (BAS) and Behavioral inhibition system (BIS) with students’ capabilities and Behavioral disorders. Our statistical population included all the male and female students studying in junior high school and the first grade of high school in the school year ran from 2003-2004, out of which 600 students (288 boys and 312 girls) were selected using multi-stage sampling and the instruments employed were "Gary and Wilson Personality Questionnaire (GWPQ) and Goodman’s Strength and Difficulties Questionnaire (SDQ)" filling out self-report and parents-report forms.Findings indicated that anxiety disorders are positively, significantly correlated to Behavioral approach system, conduct disorder (CD) and attention deficit hyperactivity disorder (ADHD). Overall, our findings also showed a statically significant relationship between Behavioral approach system in Gary and Wilson’s theory and students ‘capabilities.

Background: Study of personality can help to explanation of pathology in mental disorders. The aim of this study was to examine major depressive disorder (MDD) based on revisedreinforcement sensitivity theory (r-RST). Materials and Methods: Forty-five patients with MDD along with 45 healthy individuals as a control group participated in the present study. Following the informed consent form, Structured Clinical Interview (SCID-I), General Intelligence Test (SGIT), Jackson's 5-factor questionnaire for assessing personality, and Beck Depression Inventory (BDI-II) were administered to the two groups. Data were analyzed using Chi-square, independent t-test, analyses of variance (ANOVA), and multiple analyses of variance (MANOVA). Results: MANOVA results showed a significant difference between MDD and control groups in the items of Jackson's 5-items questionnaire. The MDD group score in r-BAS (P<0. 001, η 2=0. 242) was lower than that of the control group but was higher in r-BIS (P<0. 001, η 2=0. 367), Fight (P<0. 001, η 2=0. 245), Flight (P<0. 001, η 2=0. 068) and Freeze (P<0. 001, η 2=0. 081). Conclusion: Depression is significantly related to Behavioral inhibition system but not related to behavior activation system. A more knowledge of r-RST can help in the diagnosis, aberration and continuation of common mental disorders. The results of this study can help in understanding the pathology associated with the personality of patients with MDD.