Background: Several studies have indicated that obsessive-compulsive disorder (OCD) is a common comorbidity in\npatients with psychotic disorders, but there is sparse knowledge about the relationship between symptoms of OCD\nand psychotic symptoms. Metacognitions which guides thinking and coping is theorized to be a transdiagnostic\ncomponent central for development and maintenance of psychological disorders, OCD and psychosis included. The\naim of the study was therefore to explore how symptoms of OCD and metacognitions relate to symptoms of\npsychosis. Our main hypotheses were that metacognitions would be significantly related to all symptoms of\npsychological distress, and that there is considerable overlap between symptoms of psychosis and OCD.\nMethods: Community controls (N = 194) completed an internet survey measuring levels of paranoid ideation,\npredisposition to hallucinations, symptoms of OCD, depression, anxiety, and metacognitions. Correlations and\nhierarchical multiple linear regression analyses were used to unveil the relationship between symptoms and beliefs.\nResults: Symptoms of OCD showed a strong positive correlation with symptoms of psychosis, and the relationships\nwere still significant after controlling for symptoms of anxiety and depression. Metacognitions also showed strong\npositive correlations with all symptom measures. Metacognition and OCD-symptoms accounted for 53.8% of the\nvariance in paranoid ideation and 43.8% of predisposition to hallucinations. There was a large overlap between\nsymptoms of psychosis, OCD-symptoms, and metacognitions (30.2ââ?¬â??37.3%).\nConclusions: In general, the results suggest considerable overlap between paranoid ideation, predisposition to\nhallucinations, and OCD and metacognitive beliefs in a non-clinical sample. Further experimental- and clinical\nstudies are needed in order to explore metacognitive models of OCD and psychosis.
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