Prediction of Severity of Delusion Based on Jumping-to-Conclusion Bias in Schizophrenia Patients

Objectives: New cognitive theories of delusions have proposed that deficit or bias in inference stage (a stage of normal belief formation) is significant in delusion formation. The aim of this study was predicting the severity of delusions based on jumping-to-conclusion bias in patients with schizophrenia. Methods: The sample consisted of 60 deluded patients with schizophrenia who were selected from the Ebnesina and Razi hospitals in Shiraz using convenience sampling method. The Similarity Task was used to measure the jumping-to-conclusion biases. Results: Its results have shown that the jumping-to-conclusion biases could predict a great part of the variance of delusions. Discussion: These results generally indicated that the jumping to conclusion biases may provide a more useful explanation for the delusion formation.