ISSN 2043-8087
Journal of Experimental Psychopathology
 Volume 8, Issue 3, 288-302, 2017
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Bias Against Disconfirmatory Evidence in a large Nonclinical Sample: Associations with Schizotypy and Delusional Beliefs

  Michael Bronstein - Yale University Dept. of Psychology
  Tyrone D. Cannon - Yale University Dept. of Psychology

Volume 8, Issue 3, 2017, Pages 288-302


Bias against disconfirmatory evidence (BADE) associates with delusion-like ideation and delusion-related aspects of schizotypy in nonclinical populations. Using a well-validated BADE assessment, we sought to demonstrate that only one of two facets of BADE (Evidence Integration, and not Conservatism) accounts for these associations. To this end, 743 MTurk participants completed a survey which included the Schizotypal Personality Questionnaire (SPQ), the Peter’s Delusion Inventory (PDI), and a version of the aforementioned BADE assessment adapted to increase its fidelity to real-world belief revision processes. Using multiple regression, it was found that only Evidence Integration accounted for unique variance in delusion-related outcomes. These results suggest that, as hypothesized, Evidence Integration specifically associates with personality traits and cognitions previously linked to BADE more generally. These findings suggest that in the general population ambiguous situations may combine with cognitive biases to maintain delusion-like ideation.

Table of Contents
Supplementary Material
 Section 1. Main Manuscript Results Without Outlier Processing
 Section 2. Liberal Acceptance, Hypersaliance of Evidence-Hypothesis Matches, and Initial Plausibility Ratings in the BADE Task

Correspondence to
Michael V. Bronstein

BADE, belief revision, delusions, Evidence Integration, nonclinical

Received 31 Mar 2016; Revised 21 Mar 2017; Accepted 21 Mar 2017; In Press 16 Apr 2017

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