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BACKGROUND: Cognitive biases may contribute to delusion persistence. We tested this in a longitudinal study of first episode psychosis (FEP). METHODS: 34 FEP patients completed assessments of delusions and Jumping to Conclusions (JTC) at baseline and 12-month follow-up. RESULTS: JTC was associated with baseline delusion severity (t(32)=2.7, p=0.01). Baseline delusions persisted at follow-up for 8/20 participants (40%), who all jumped to conclusions (8/8, 100%), compared to half of those with no or changeable delusions (14/26, 54%; χ(2) (df=1)=5.7, p=0.03; Phi=0.4). CONCLUSION: Findings implicate cognitive biases in delusion persistence, and support the potential to reduce delusions through reasoning-focused interventions.

Original publication




Journal article


Schizophr Res

Publication Date





243 - 246


Delusions, Jumping to conclusions, Neuropsychology, Psychosis, Reasoning, Adolescent, Adult, Awareness, Decision Making, Delusions, Female, Follow-Up Studies, Humans, Male, Middle Aged, Psychiatric Status Rating Scales, Psychotic Disorders, Severity of Illness Index, Young Adult