Attentional bias and its temporal dynamics among war veterans suffering from chronic pain: investigating the contribution of post-traumatic stress symptoms Mahdi Mazidi a,b, Kelsey Vig c,Seyran Ranjbar d,Mohammad-Reza Ebrahimi e, Ali Khatibi f* a Centre for the Advancement of Research on Emotion, The University of Western Australia, Crawley, WA, Australia b Department of Clinical Psychology, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran c Department of Psychology, University of Regina, Regina, SK, Canada d Psychology Department, Shahid Beheshti University, Tehran, Iran e Military Psychiatry Center, 505 Psychiatric hospital, AJA University of Medical Sciences, Tehran, Iran f Department of Neurology and Neurosurgery, McGill University, Montreal, QC, Canada * Corresponding Author: Ali Khatibi,
[email protected], address: NW141, Montreal Neurological Institute, Montreal, Canada, Phone: +1-514-398-5564 Funding sources: This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors. Conflict of interests: Authors declare no conflict of interest regarding the current submission 1 Abstract Background: Cognitive models propose that attentional dysregulation, including an attentional bias towards threat, is one of the factors through which chronic pain and post- traumatic stress symptoms (PTSS) maintain and exacerbate one another. The current investigation assessed the attentional bias for painful facial expressions and its relationship with PTSS, using both traditional and variability-based attentional bias measures, among veterans with chronic pain and PTSS and controls. Method: Fifty-four veterans with chronic pain and 30 age/education-matched controls participated in this investigation. Participants completed a self-report measure of PTSS and a modified version of the dot-probe task with painful, happy, and neutral facial expressions.