ArticleNEED FOR CLOSURE AND JUMPING-TO-CONCLUSIONS IN DELUSION-PRONE INDIVIDUALSCOLBERT, SUSANNAH MAY B.Sc.1; PETERS, EMMANUELLE R. Ph.D.2Author Information 1 University Department of Psychiatry and Psychology, GKT, University of London, St. Thomas’s Hospital, London SE1 7EH, United Kingdom. Send reprints request to Ms. Colbert. 2 Department of Clinical Psychology, Institute of Psychiatry, University of London, United Kingdom. The Journal of Nervous and Mental Disease: January 2002 - Volume 190 - Issue 1 - p 27-31 Buy Abstract Members of the general population were screened for delusion-proneness using the Peters et al. Delusions Inventory (PDI). Two groups were formed from the participants who scored in the upper and lower quartiles of the PDI and compared on a probability judgment task and on the Need for Closure scale (NFC). The study investigated whether the “jump-to-conclusions” (JTC) reasoning bias, characteristic of deluded participants, could be found in delusion-prone individuals. NFC was investigated as a motivational factor that may correlate with this reasoning bias. Evidence for the existence of the data-gathering, but not the probability judgment, part of the JTC reasoning bias was found in the delusion-prone individuals. This group also scored significantly higher on the NFC scale. As the data-gathering reasoning bias was found in delusion-prone individuals this suggests that it may be involved in the formation, rather than merely the maintenance, of delusional beliefs. © 2002 Lippincott Williams & Wilkins, Inc.