Treatment as Usual will continue for patients in both groups. CBM-pa involves participants reading stories on a computer screen, completing missing words and answering questions about each story in a way that encourages more helpful beliefs about themselves and others. Patients will be randomised at a 50:50 ratio, to computerised CBM-pa or a text-reading control intervention, receiving one 40-min session per week, for 6 weeks. The ‘Cognitive Bias Modification for paranoia’ (CBM-pa) study is a feasibility, double-blind, randomised controlled trial (RCT) for 60 stabilised outpatients with persistent, distressing paranoid symptoms. Our aim is to test the clinical feasibility of a novel psychological intervention, which manipulates biased interpretations toward more adaptive processing, in order to reduce paranoia in patients. Recent advances favour targeted interventions, focussing on specific symptoms or mechanisms. Persecutory delusions are thought to be sustained by biased cognitive and emotional processes. Persecutory delusions are the most common type of delusions in psychosis and present in around 10–15% of the general population.
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