Differential relationship of jumping-to-conclusions and incorrigibility with delusion severity

Differential relationship of jumping-to-conclusions and incorrigibility with delusion severity. Christina Andreou, Ruth Veckenstedt, Thies Lüdtke, Vasilis P. Bozikas, Steffen Moritz. Psychiatry Research, https://doi.org/10.1016/j.psychres.2018.04.014

Highlights
•We investigated trait and state aspects of jumping-to-conclusions and incorrigibility
•The two reasoning biases showed differential associations with delusion severity
•Results suggest different roles of the two biases in delusion formation / maintenance

Abstract: Reasoning biases such as jumping-to-conclusions (JTC) and incorrigibility have been suggested to contribute to the generation and maintenance of delusions. However, it is still debated whether these biases represent stable traits of patients with delusions, or are related to state fluctuations in delusion severity. The present study aimed to elucidate this question by combining a cross-sectional with a longitudinal approach. JTC, incorrigibility and delusion severity were assessed in 79 patients with a history of delusions over a 6-month period. To allow for a differentiated look into effects of time vs. symptom changes, patients were divided into patients with (D+) and without (D-) current delusions at baseline. Significant improvement of delusions was noted in D+ at follow-up. JTC did not differ between the two patient groups either at baseline or over time. In contrast, incorrigibility was significantly higher in D+ than D- at baseline; this difference remained stable throughout the 6-month follow-up period. The two biases did not significantly co-vary over time. Our results suggest a dissociation between incorrigibility and JTC as regards their relation to current presence of delusions, and tentatively support theoretical accounts attributing different roles to the two biases in the generation (JTC) and maintenance (incorrigibility) of delusions.

Keywords: Reasoning biases, Cognitive biases, Jumping-to-conclusions, Belief flexibility, Bias against disconfirmatory evidence, Psychosis

h/t: https://twitter.com/DegenRolf