ObjectivesThe present research was conducted to compare cognitive errors and rumination in patients with obsessive-compulsive and social phobia disorders. Methods The research design was cross-sectional post event descriptive survey. The research participants included 30 patients with social phobia disorder and 30 patients with obsessive-compulsive disorder who were aged between 15 and 50 years in Zanjan city, who were available samples. They were selected on the basis of psychiatrist diagnosis and structured diagnostic interviews (SCID-I) and (SCID-II), and the inclusion and exclusion criteria. Cognitive errors questionnaire and ruminative response style questionnaire were used to measure the variables. Results The results, analyzed using multivariate analysis of variance, indicated that there is a significant difference with regard to the components of cognitive error between the patients belonging to the two groups (obsessive-compulsive and social phobia disorders )(P≤0.05). There was no significant difference between the mean scores of rumination components in groups' P≤0.05 level. Conclusion According to the research findings, cognitive errors and rumination play important roles in obsessive-compulsive and social phobia disorders as experienced by both the groups. However, the patients with obsessive-compulsive disorder had more cognitive errors compared to the patients with social phobia disorder. The results confirm the equal role of rumination in the psychopathology of these two groups.

One of the most common anxiety disorders is the Social Anxiety Disorder (SAD) which is characterized by intolerable anxiety and self-consciousness in daily social situations. Although a large body of study is conducted on the treatment for this disorder, further studies are required on new psychological therapies. The present study aims to evaluate the effectiveness of Acceptance and Commitment Therapy (ACT) on patients with SAD. The present randomized controlled trial (RCT) study is done along with pre-test, post-test and follow-up with control group. Based on the Structured Clinical Interview for DSM (SCID), the 34 subjects who were prone to social anxiety disorder on the basis of DSM-5but had no other severe psychiatric disorders were distributed randomly and equally into experimental and control groups. The experimental group was treated with 12 weekly CFT sessions whereas the control group did not receive any treatment. In the initial phase of the research work especially after 12 weeks and after a followup period of 8 weeks, all subjects were evaluated with AAQ-II, MAAS, LOSC, SCS, WHOQOL-BREF and LSAS instruments. In addition to descriptive statistics, repeated measure analysis of variance (RM-ANOVA) was used in order to analyze the findings.Byusing SPSS-21 software, all analyses were conducted. Based on the RM-ANOVA, Acceptance and Commitment Therapy was found more effective than the control group in all of the studied variables in posttest and follow-up. All the observed differences between the two groups were significant (P < 0.01). Acceptance and commitment therapy (ACT) seems to play an essential role in reducing symptoms and in improving the quality of the life of patients with social anxiety disorder (SAD).