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This is a post by Vaughan Bell and gives a summary of a new pre-printed paper called ‘ De-Rationalising Delusions ’ co-authored with Nichola Raihani and Sam Wilkinson .  Vaughan is an Associate Professor in Clinical Psychology at University College London, and also works in the Psychological Interventions Clinic for outpatients with Psychosis (PICuP), in South London and Maudsley NHS Foundation Trust. Nichola Raihani is a Professor in Evolution and Behaviour at University College London, and Sam Wilkinson is a Lecturer in Philosophy at Exeter University.   Historically, delusions have been understood as pathological beliefs that are characterised by their irrationality. Someone who believes, for example, that a camera has been implanted in their tooth and is taking pictures of their mind, would seem, on face value, to have problems in reasoning rationally about the world. This has motivated researchers to look for problems in domain-general reasoning to explain delusions. Th...