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Cerebral function in posttraumatic stress disorder during verbal working memory updating: a positron emission
C Richard Clark1, Alexander C McFarlane, Philip Morris
1School of Psychology, Flinders Medical Research Institute, Flinders University, Adelaide, Australia.
Biological Psychiatry
|March 20, 2003
Summary
Individuals with posttraumatic stress disorder (PTSD) show altered brain activity during working memory tasks. Specifically, PTSD affects left dorsolateral prefrontal cortex activation crucial for cognitive control.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Psychiatry
Background:
- Posttraumatic stress disorder (PTSD) is associated with altered brain function.
- Working memory is critical for cognitive processing and emotional regulation.
Purpose of the Study:
- To investigate cerebral function in PTSD during working memory updating.
- To examine how PTSD affects the brain's response to trauma-neutral verbal information.
Main Methods:
- Ten individuals with PTSD and matched controls performed a visuoverbal target detection task.
- The task involved conditions with continuous updating or no updating of target identity.
- Brain activity was assessed by comparing condition-specific activation patterns.
Main Results:
- Healthy individuals showed bilateral dorsolateral prefrontal cortex (DLPFC) and inferior parietal lobe activation during updating.
- The PTSD group exhibited reduced left DLPFC activation and increased bilateral superior parietal lobe activation.
- Significant differences in left DLPFC activation were observed between the PTSD and control groups.
Conclusions:
- Altered parietal activation in PTSD suggests a reliance on visuospatial coding for verbal working memory.
- Reduced DLPFC involvement in PTSD indicates a diminished executive role in managing working memory content.
- These findings highlight neurobiological differences in cognitive control mechanisms in PTSD.