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Tracking resting state connectivity dynamics in veterans with PTSD.

Han Yuan1, Raquel Phillips2, Chung Ki Wong2

  • 1Stephenson School of Biomedical Engineering, University of Oklahoma, Norman, OK, USA; University of Oklahoma Institute for Biomedical Engineering, Science and Technology, Norman, OK, USA; Laureate Institute for Brain Research, Tulsa, OK, USA.

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Summary

This study reveals distinct brain network dynamics in veterans with posttraumatic stress disorder (PTSD). Abnormalities in resting-state networks, measured by EEG and fMRI, correlate with PTSD severity and mood.

Keywords:
Combat veteransFunctional connectivityPosttraumatic stress disorderResting state networksSimultaneous EEG and fMRITemporal independent EEG microstates

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Medical Imaging

Background:

  • Posttraumatic stress disorder (PTSD) is linked to functional brain abnormalities, particularly in threat detection and emotion regulation networks.
  • Previous neuroimaging studies report altered salience and executive function networks in PTSD.

Purpose of the Study:

  • To investigate the dynamic properties of resting-state functional magnetic resonance imaging (fMRI) networks in combat-related PTSD.
  • To utilize a novel multimodal approach integrating electroencephalography (EEG) and fMRI to analyze brain activity.

Main Methods:

  • Simultaneous EEG and fMRI were used to record neurobiological activity in 36 veterans with combat-related PTSD and 20 controls.
  • A new strategy integrated EEG microstates with fMRI to quantify fast temporal dynamics of resting-state networks.

Main Results:

  • Distinct microstate occurrence rates were observed in the dorsal default mode network and salience networks in the PTSD group.
  • Dorsal default mode network microstate rates correlated positively with PTSD severity; anterior salience network microstate rates correlated negatively with hedonic tone.

Conclusions:

  • Findings highlight abnormal network dynamics in combat-related PTSD, offering insights into the disorder's pathophysiology.
  • Simultaneous EEG-fMRI is a promising tool for studying PTSD neurobiology.