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ised fo 1.1. Reasoning biases in psychosis ence. A Bayesian approach provides a general frame-work for evaluating beliefs as it incorporates knowledge widely in the literature relevant to schizophrenia. The tendency to JTC, request less information, abandon existing hypotheses readily and express higher certainty Psychiatry Research 150 (20⁎Several authors have suggested that a defective or un-usual reasoning style may help account for psychotic experiences, and in particular the development and main-tenance of delusions. Most prominently, Garety (1991) postulates that delusions stem from a bias in probabilistic reasoning because of a resultant tendency to ‘jump to conclusions ’ (JTC).According to this account, peoplewith delusions abandon existing hypotheses more readily than others and form new ones on little supporting evidence. of prior events in order to predict future events. It also permits the revision of one's belief in a hypothesis when new information is obtained (Fischoff and Beyth-Marom, 1983). This framework is useful as it allows investigation into the way in which people reach con-clusions when reasoning probabilistically, rather than solely if the answer was right or wrong, (Garety and Freeman, 1999). A probabilistic reasoning bias has been demonstratedtask. It was found that highly anhedonic participants made more invalid inferences both when reasoning about the consequences of others ' emotions and implications for their own self-state. Impulsive Non-conformity was also associated with poor reasoning when ‘deducing consequences from others emotions’. The findings suggest that individuals with impulsive and/or anhedonic traits may tend to ignore alternative information when reasoning about personally relevant emotional statements leading to poorer reasoning