@ARTICLE{10.3389/fpsyt.2015.00066, AUTHOR={Khazaal, Yasser and Chatton, Anne and Dieben, Karen and Huguelet, Philippe and Boucherie, Maria and Monney, Gregoire and Lecardeur, Laurent and Salamin, Virginie and Bretel, Fethi and Azoulay, Silke and Pesenti, Elodie and Krychowski, Raoul and Costa Prata, Andreia and Bartolomei, Javier and Brazo, Perrine and Traian, Alexei and Charpeaud, Thomas and Murys, Elodie and Poupart, Florent and Rouvière, Serge and Zullino, Daniele and Parabiaghi, Alberto and Saoud, Mohamed and Favrod, Jérôme}, TITLE={Reducing Delusional Conviction through a Cognitive-Based Group Training Game: A Multicentre Randomized Controlled Trial}, JOURNAL={Frontiers in Psychiatry}, VOLUME={6}, YEAR={2015}, URL={https://www.frontiersin.org/articles/10.3389/fpsyt.2015.00066}, DOI={10.3389/fpsyt.2015.00066}, ISSN={1664-0640}, ABSTRACT={Objective“Michael’s game” (MG) is a card game targeting the ability to generate alternative hypotheses to explain a given experience. The main objective was to evaluate the effect of MG on delusional conviction as measured by the primary study outcome: the change in scores on the conviction subscale of the Peters delusions inventory (PDI-21). Other variables of interest were the change in scores on the distress and preoccupation subscales of the PDI-21, the brief psychiatric rating scale, the Beck cognitive insight scale, and belief flexibility assessed with the Maudsley assessment of delusions schedule (MADS).MethodsWe performed a parallel, assessor-blinded, randomized controlled superiority trial comparing treatment as usual plus participation in MG with treatment as usual plus being on a waiting list (TAU) in a sample of adult outpatients with psychotic disorders and persistent positive psychotic symptoms at inclusion.ResultsThe 172 participants were randomized, with 86 included in each study arm. Assessments were performed at inclusion (T1: baseline), at 3 months (T2: post-treatment), and at 6 months after the second assessment (T3: follow-up). At T2, a positive treatment effect was observed on the primary outcome, the PDI-21 conviction subscale (p = 0.005). At T3, a sustained effect was observed for the conviction subscale (p = 0.002). Further effects were also observed at T3 on the PDI-21 distress (p = 0.002) and preoccupation subscales (p = 0.001), as well as on one of the MADS measures of belief flexibility (“anything against the belief”) (p = 0.001).ConclusionThe study demonstrated some significant beneficial effect of MG.} }