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Psychother."],"published-print":{"date-parts":[[2009,7]]},"abstract":"<jats:p><jats:bold>Background:<\/jats:bold>This study investigated the role of cognitive mechanisms underlying obsessive compulsive and panic disorders in psychosis, and in particular, their possible contributions to acute psychosis.<jats:bold>Method:<\/jats:bold>A total of 90 participants were recruited comprising three equal-size groups, including two clinical groups (acute and stable) and one non-clinical matched control group. Symptom severity and distress was assessed using the PSYRATS, and questionnaire measures of anxiety and obsessive beliefs were administered to all participants.<jats:bold>Results:<\/jats:bold>Individuals with a diagnosis of psychosis reported significantly higher levels of obsessional beliefs and anxiety sensitivity than the non-clinical group. Furthermore, acutely psychotic patients reported a significantly higher sense of responsibility and catastrophic misinterpretation than the stable psychiatric controls, and than samples of OCD and GAD patients.<jats:bold>Conclusions:<\/jats:bold>Results suggest that these anxiety processes are particularly important during acute psychotic episodes, beyond the reported comorbidity. 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