Functional connectivity reveals inefficient working memory systems in post-traumatic stress disorder

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Psychiatry

Background:

• Working memory (WM) is crucial for cognitive function.
• Post-traumatic stress disorder (PTSD) is associated with cognitive deficits.
• Understanding neural underpinnings of WM in PTSD is essential.

Purpose of the Study:

• To investigate functional magnetic resonance imaging (fMRI) brain network abnormalities in working memory (WM) systems in patients with post-traumatic stress disorder (PTSD).
• To compare large-scale brain network activity during WM updating and maintenance tasks between PTSD patients and healthy controls.

Main Methods:

• Covariance-based multivariate analysis of functional magnetic resonance imaging (fMRI) data.
• Participants included 13 patients with PTSD and 12 matched healthy controls.
• fMRI scans were acquired while participants performed verbal stimuli updating and maintenance tasks in WM.

Main Results:

• Healthy controls exhibited distinct fronto-parietal networks for WM updating and maintenance.
• PTSD patients demonstrated a single fronto-parietal network for both WM tasks, indicating inefficient resource allocation.
• A second network, unique to PTSD patients, showed differential activation in regions linked to hyperarousal and abnormal reactivity.

Conclusions:

• PTSD is associated with aberrant large-scale brain network organization during working memory tasks.
• The findings suggest inefficient cognitive resource allocation and potential hyperarousal-related neural activity in PTSD.
• Abnormal fronto-parietal network engagement in WM may contribute to cognitive deficits observed in PTSD.