Citation

de Kleine RA, Hendriks L, Becker ES, Broekman TG, van Minnen A. J. Anxiety Disord. 2017; 49: 48-52.

Affiliation

Center for Anxiety Disorders Overwaal, Institution for Integrated Mental Health Care Pro Persona, Nijmegen, The Netherlands; Radboud University, Behavioural Science Institute, NijCare, Nijmegen, The Netherlands.

Copyright

(Copyright © 2017, Elsevier Publishing)

DOI

10.1016/j.janxdis.2017.03.008

PMID

28399468

Abstract

Exposure therapy has proven efficacy in the treatment of posttraumatic stress disorder (PTSD). Emotional processing theory proposes that fear habituation is a central mechanism in symptom reduction, but the empirical evidence supporting this is mixed. Recently it has been proposed that violation of harm expectancies is a crucial mechanism of action in exposure therapy. But to date, changes in harm expectancies have not been examined during exposure therapy in PTSD. The goal of the current study was to examine harm expectancy violation as mechanism of change in exposure therapy for posttraumatic stress disorder (PTSD). Patients (N=50, 44 female) with a primary diagnosis of chronic PTSD received intensive exposure therapy. Harm expectancies, harm experiences and subjective units of distress (SUDs) were assessed at each imaginal exposure session, and PTSD symptoms were assessed pre- and posttreatment with the Clinician Administered PTSD Scale (CAPS).

RESULTS showed that harm expectancies were violated within and strongly declined in-between exposure therapy sessions. However, expectancy violation was not related to PTSD symptom change. Fear habituation measures were moderately related to PTSD symptom reductions. In line with theory, exposure therapy promotes expectancy violation in PTSD patients, but this is not related to exposure therapy outcome. More work is warranted to investigate mechanisms of change during exposure therapy in PTSD.

Copyright © 2017 Elsevier Ltd. All rights reserved.

Language: en

Keywords

Expectancy violation; Exposure therapy; Fear habituation; Mechanisms of change; PTSD