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Developing Neuroimaging Phenotypes of the Default Mode Network in PTSD: Integrating the Resting State, Working Memory, and Structural Connectivity
Published on: July 1, 2014
Integrative assessment of brain function in PTSD: brain stability and working memory
Melinda D Veltmeyer1, Alexander C McFarlane, Richard A Bryant
1Cognitive Neuroscience Laboratory and School of Psychology, Flinders University of South Australia, Adelaide 5001, Australia.
Journal of Integrative Neuroscience
|March 18, 2006
Summary
Posttraumatic Stress Disorder (PTSD) is linked to altered brain activity and arousal. This study connects brain working memory deficits to underlying brain stability issues in PTSD patients.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Psychology
Background:
- Posttraumatic Stress Disorder (PTSD) is associated with hyperarousal, avoidance, intrusive memories, and attention deficits.
- Previous studies indicate electroencephalogram (EEG) and event-related potential (ERP) abnormalities in PTSD, but their interrelations and links to clinical symptoms are unclear.
Purpose of the Study:
- To investigate the relationship between EEG-indexed cortical arousal, working memory, and attention deficits in PTSD.
- To determine how these neurophysiological and cognitive abnormalities correlate with clinical symptoms of PTSD.
Main Methods:
- Collected EEG data during resting (eyes-open) and a working memory task (one-back).
- Assessed behavioral and clinical (CAPS) measures of working memory, attention, and PTSD severity.
- Analyzed relationships between EEG parameters (alpha power, theta/alpha ratio), ERPs (P3 amplitude), and behavioral performance.
Main Results:
- PTSD group exhibited altered cortical arousal (reduced alpha power, increased theta/alpha ratio), correlating with clinical arousal measures.
- Working memory deficits in PTSD were observed in both theta power and ERP indices, suggesting linked abnormalities.
- Medication status influenced parameters like P3 amplitude and target detection accuracy.
Conclusions:
- Abnormalities in brain working memory in PTSD may be associated with underlying issues in brain stability.
- This study provides a more integrated view of neurophysiological and cognitive deficits in PTSD, accounting for medication status.
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