Aberrant Neural Connectivity during Emotional Processing Associated with Posttraumatic Stress.
Naomi Sadeh1, Jeffrey M Spielberg2, Stacie L Warren3
1University of Illinois at Urbana-Champaign ; National Center for PTSD, VA Boston Healthcare System.
Summary
Posttraumatic stress disorder (PTSD) symptoms alter brain connectivity. Hyperarousal links to amygdala-mPFC coupling, while reexperiencing affects hippocampus-insula function, impacting emotional processing.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Science
Background:
- Understanding the neural basis of posttraumatic stress disorder (PTSD) is complex.
- Characterizing functional connectivity among brain regions is crucial for explaining PTSD pathophysiology.
Purpose of the Study:
- To examine functional connectivity patterns in brain regions associated with PTSD.
- To investigate how PTSD symptom severity influences neural network coupling during emotional processing.
Main Methods:
- Functional connectivity was assessed in 35 trauma-exposed adults using an emotion-word Stroop task.
- The study analyzed the moderating effects of PTSD symptom severity on brain region coupling.
Main Results:
- Hyperarousal symptoms moderated amygdala-medial prefrontal cortex (mPFC) coupling, correlating with impairment and amygdala reactivity.
- Reexperiencing symptoms moderated hippocampus-insula coupling during emotional word processing.
- PTSD symptoms differentially alter functional coupling during emotional interference tasks.
Conclusions:
- Altered functional connectivity patterns in PTSD may indicate dysfunctional inhibitory control during affective processing.
- Hyperarousal is linked to negative mPFC-amygdala coupling, while reexperiencing is associated with altered insula-hippocampus function.
- Network connectivity analysis is vital for PTSD research, potentially revealing separable indicators of the disorder.
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