Reduced lateral prefrontal cortical volume is associated with performance on the modified Iowa Gambling Task: A surface based morphometric analysis of previously deployed veterans

Nicholas D. Fogleman, Farah Naaz, Lindsay K. Knight, Teodora Stoica, Samantha C. Patton, Jennifer H. Olson-Madden, Meghan C. Barnhart, Trisha A. Hostetter, Jeri Forster, Lisa A. Brenner, Marie T. Banich, Brendan E. Depue

Research output: Contribution to journalArticle

Abstract

Post-traumatic stress disorder (PTSD) and mild traumatic brain injury (mTBI) are two of the most common consequences of combat deployment. Estimates of comorbidity of PTSD and mTBI are as high as 42% in combat exposed Operation Enduring Freedom, Operation Iraqi Freedom and Operation New Dawn (OEF/OIF/OND) Veterans. Combat deployed Veterans with PTSD and/or mTBI exhibit deficits in classic executive function (EF) tasks. Similarly, the extant neuroimaging literature consistently indicates abnormalities of the ventromedial prefrontal cortex (vmPFC) and amygdala/hippocampal complex in these individuals. While studies examining deficits in classical EF constructs and aberrant neural circuitry have been widely replicated, it is surprising that little research examining reward processing and decision-making has been conducted in these individuals, specifically, because the vmPFC has long been implicated in underlying such processes. Therefore, the current study employed the modified Iowa Gambling Task (mIGT) and structural neuroimaging to assess whether behavioral measures related to reward processing and decision-making were compromised and related to cortical morphometric features of OEF/OIF/OND Veterans with PTSD, mTBI, or co-occurring PTSD/mTBI. Results indicated that gray matter morphometry in the lateral prefrontal cortex (lPFC) predicted performance on the mIGT among all three groups and was significantly reduced, as compared to the control group.

Original languageEnglish (US)
Pages (from-to)1-8
Number of pages8
JournalPsychiatry Research - Neuroimaging
Volume267
DOIs
Publication statusPublished - Sep 30 2017
Externally publishedYes

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Keywords

  • Anatomy
  • Magnetic resonance imaging (MRI)
  • Mild traumatic brain injury (mTBI)
  • Modified Iowa Gambling Task (mIGT)
  • Post-traumatic stress disorder (PTSD)
  • Veterans

ASJC Scopus subject areas

  • Neuroscience (miscellaneous)
  • Radiology Nuclear Medicine and imaging
  • Psychiatry and Mental health

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