title: Expectancy bias and the persistence of posttraumatic stress.
abstract: Anxious individuals tend to overestimate the probability that encounters with anxiogenic stimuli (CS) will be followed by aversive consequences (UCS). This study examined whether such (biased) UCS expectancies predict the persistence of PTSD symptoms. A total of 265 soldiers were recruited before a four-month deployment to Iraq in 2004. About 2-5 months after deployment, 171 (65%) soldiers completed self-report scales about adverse events in Iraq and PTSD symptoms, and a UCS expectancy task. In this task, participants were exposed to a series of deployment-related and deployment-unrelated (control) picture stimuli. For each trial, the participants indicated the subjective probability that a particular slide would be followed by an imminent loud noise. Around 15 months after deployment, 130 (76%) soldiers completed surveys about PTSD symptoms again. Only a small group of participants had high levels of PTSD symptoms. Regression analyses showed that the level of PTSD symptoms at 15 months was predicted by earlier PTSD symptoms, but also and independently by an enhanced UCS expectancy to deployment-related stimuli. The findings support the notion that UCS expectancy bias contributes to the persistence of PTSD symptoms.
authors.affiliation: Clinical and Health Psychology, Utrecht University, Utrecht, The Netherlands. i.m.engelhard@uu.nl
authors.forename: Iris M
authors.initials: IM
authors.lastname: Engelhard
authors.forename: Peter J
authors.initials: PJ
authors.lastname: de Jong
authors.forename: Marcel A
authors.initials: MA
authors.lastname: van den Hout
authors.forename: Mark
authors.initials: M
authors.lastname: van Overveld
mesh_terms: D000293:Adolescent; D000328:Adult; D001007:Anxiety / Q000523:psychology*; D001288:Attention; D003130:Combat Disorders / Q000175:diagnosis / Q000523:psychology*; D005260:Female; D006801:Humans; D054542:Iraq War, 2003-2011; D008016:Life Change Events; D008297:Male; D008889:Military Personnel / Q000523:psychology*; D010555:Personality Inventory; D011569:Psychiatric Status Rating Scales; D057566:Self Report; D013313:Stress Disorders, Post-Traumatic / Q000175:diagnosis / Q000523:psychology*; D011795:Surveys and Questionnaires