Original ArticlesPosttraumatic Stress Disorder's Underlying Dimensions and Their Relation With Impulsivity FacetsContractor, Ateka A. PhD*†; Armour, Cherie PhD‡; Forbes, David PhD§; Elhai, Jon D. PhD*∥Author Information *Department of Psychology, University of Toledo, OH; †Division of Clinical Psychology, Department of Psychiatry and Human Behavior, Warren Alpert Medical School of Brown University, Providence, RI; ‡School of Psychology, University of Ulster, Coleraine Campus, Londonderry, Ireland; §Australian Centre for Posttraumatic Mental Health, and Department of Psychiatry, University of Melbourne, Victoria, Australia; and ∥Department of Psychiatry, University of Toledo, Ruppert Health Center, OH. Ateka A. Contractor, PhD, is now affiliated with the VA Boston Healthcare System (Massachusetts Veterans Epidemiology Research and Information Center). Send reprint requests to Ateka A. Contractor, PhD, Division of Clinical Psychology, Department of Psychiatry and Human Behavior, Warren Alpert Medical School of Brown University, Providence, RI 02912. E-mail: Ateka.email@example.com. The Journal of Nervous and Mental Disease: January 2016 - Volume 204 - Issue 1 - p 20–25 doi: 10.1097/NMD.0000000000000417 Buy Metrics Abstract Research indicates a significant relationship between posttraumatic stress disorder (PTSD) and impulsivity (Kotler, Julian, Efront, and Amir, J Nerv Ment Dis 189:162–167, 2001; Ledgerwood and Petry, J Trauma Stress 19:411–416, 2006). The present study assessed relations between PTSD symptom clusters and impulsivity subscales in an effort to assess the specific impulsivity component most related to PTSD's alterations in arousal/reactivity and alterations in mood/cognitions symptoms. In the current study, the PTSD Checklist for Diagnostic and Statistical Manual of Mental Disorders, 5th Edition, and the UPPS Impulsivity Scale were administered to a sample of 412 nonclinical subjects with a trauma history. Results indicated that PTSD's alterations in arousal/reactivity and mood/cognition factors were most related to impulsivity's sensation-seeking tendency compared with other impulsivity components. Results highlight the importance of assessing and addressing (1) sensation-seeking tendencies and (2) urges to act impulsively when experiencing negative affect in trauma treatment. Furthermore, it is possible that sensation-seeking tendencies are primarily driving the comorbidity between PTSD and certain impulsive behaviors. Copyright © 2016 Wolters Kluwer Health, Inc. All rights reserved.