Citation

Rabinak CA, MacNamara A, Kennedy AE, Angstadt M, Stein MB, Liberzon I, Phan KL. Depress. Anxiety 2014; 31(10): 851-861.

Affiliation

Mental Health Service, Veteran's Administration Ann Arbor Healthcare System, Ann Arbor, Michigan; Department of Psychiatry, University of Michigan, Ann Arbor, Michigan.

Copyright

(Copyright © 2014, John Wiley and Sons)

DOI

10.1002/da.22243

PMID

24677490

PMCID

PMC4141895

Abstract

BACKGROUND: Collectively, functional neuroimaging studies implicate frontal-limbic dysfunction in the pathophysiology of posttraumatic stress disorder (PTSD), as reflected by altered amygdala reactivity and deficient prefrontal responses. These neural patterns are often elicited by social signals of threat (fearful/angry faces) and traumatic reminders (combat sounds, script-driven imagery). Although PTSD can be conceptualized as a disorder of emotion dysregulation, few studies to date have directly investigated the neural correlates of volitional attempts at regulating negative affect in PTSD.

METHODS: Using functional magnetic resonance imaging and a well-validated task involving cognitive regulation of negative affect via reappraisal and known to engage prefrontal cortical regions, the authors compared brain activation in veterans with PTSD (n = 21) and without PTSD (n = 21, combat-exposed controls/CEC), following military combat trauma experience during deployments in Afghanistan or Iraq. The primary outcome measure was brain activation during cognitive reappraisal (i.e., decrease negative affect) as compared to passive viewing (i.e., maintain negative affect) of emotionally evocative content of aversive images RESULTS: The subjects in both groups reported similar successful reduction in negative affect following reappraisal. The PTSD group engaged the dorsolateral prefrontal cortex (dlPFC) during cognitive reappraisal, albeit to a lesser extent than the CEC group. Although the amygdala was engaged in both groups during passive viewing of aversive images, neither group exhibited attenuation of amygdala activation during cognitive reappraisal.

CONCLUSIONS: Veterans with combat-related PTSD showed less recruitment of the dlPFC involved in cognitive reappraisal, suggesting focal and aberrant neural activation during volitional, self-regulation of negative affective states.

Published 2014. This article is a U.S. Government work and is in the public domain in the USA.

Language: en

Keywords

PTSD; combat; emotion regulation; fMRI; prefrontal cortex; reappraisal