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Neural correlates of trauma-unrelated emotional processing in war veterans with PTSD

  • S. J. H. van Rooij (a1) (a2), A. R. Rademaker (a2), M. Kennis (a1) (a2), M. Vink (a1), R. S. Kahn (a1) and E. Geuze (a1) (a2)...

Abstract

Background

Post-traumatic stress disorder (PTSD) is thought to be characterized by general heightened amygdala activation. However, this hypothesis is mainly based on specific studies presenting fear or trauma-related stimuli, hence, a thorough investigation of trauma-unrelated emotional processing in PTSD is needed.

Methods

In this study, 31 male medication-naive veterans with PTSD, 28 male control veterans (combat controls; CC) and 25 non-military men (healthy controls; HC) were included. Participants underwent functional MRI while trauma-unrelated neutral, negative and positive emotional pictures were presented. In addition to the group analyses, PTSD patients with and without major depressive disorder (MDD) were compared.

Results

All groups showed an increased amygdala response to negative and positive contrasts, but amygdala activation did not differ between groups. However, a heightened dorsal anterior cingulate cortex (dACC) response for negative contrasts was observed in PTSD patients compared to HC. The medial superior frontal gyrus was deactivated in the negative contrast in HC, but not in veterans. PTSD+MDD patients showed decreased subgenual ACC (sgACC) activation to all pictures compared to PTSD–MDD.

Conclusion

Our findings do not support the hypothesis that increased amygdala activation in PTSD generalizes to trauma-unrelated emotional processing. Instead, the increased dACC response found in PTSD patients implicates an attentional bias that extends to trauma-unrelated negative stimuli. Only HC showed decreased medial superior frontal gyrus activation. Finally, decreased sgACC activation was related to MDD status within the PTSD group.

Copyright

Corresponding author

* Address for correspondence: Drs S. J. H. van Rooij, Heidelberglaan 100 (HPN A01.1.46), 3584 CX Utrecht, The Netherlands. (Email: SJHvanRooij@gmail.com)

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Neural correlates of trauma-unrelated emotional processing in war veterans with PTSD

  • S. J. H. van Rooij (a1) (a2), A. R. Rademaker (a2), M. Kennis (a1) (a2), M. Vink (a1), R. S. Kahn (a1) and E. Geuze (a1) (a2)...

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