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Persons with delusions tend to display a jumping-to-conclusions (JTC) bias which is considered relevant to delusion formation. However, its contribution in real life social scenarios is unknown. This study investigates whether JTC increases when decisions have to be made in delusion-relevant situations and whether the increase is uniquely moderated by delusion-proneness.

JTC was assessed by a social reasoning paradigm in 92 healthy participants that were classified as high, medium or low in paranoid ideation and social anxiety. Decisions had to be made for emotionally salient scenarios without direct self-relevance, self-relevant scenarios and delusion-relevant scenarios, by successively drawing pieces of information.

All participants drew less information in the scenarios that were self-relevant and delusion-relevant compared to non-self-relevant …