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Stress may cause the brain to become disconnected
Date:3/16/2009

Philadelphia, PA, March 16, 2009 Does stress damage the brain? In the March 1st issue of Biological Psychiatry, published by Elsevier, a paper by Tibor Hajszan and colleagues provides an important new chapter to this question.

This issue emerged in the 1990's as an important clinical question with the observation by J. Douglas Bremner and colleagues, then at the VA National Center for Posttraumatic Stress Disorder (PTSD), that hippocampal volume was reduced in combat veterans with PTSD. This finding was replicated by several, but not all, groups. In particular, it did not appear that this change was associated with acute PTSD. The importance of this finding was further called into question as a group associated with the Harvard Medical School found that reduced hippocampal volume predicted risk for PTSD among twins, rather than emerging as a consequence of PTSD. Yet limitations of this twin study reduced the strength of this inference, as there were relatively high rates of early life trauma in the twins without combat-related PTSD, i.e., a potential environmental source for the reductions in hippocampal volume associated with later risk for PTSD. This group also showed that cortical volume reductions in other brain regions, such as the pregenual anterior cingulate cortex, were more clearly linked to trauma than were the hippocampal changes in these twins. "This collection of clinical findings highlights an important limitation of clinical neuroimaging studies. These studies have the ability to raise important questions about brain structure in a general sense, but we still rely on studies of postmortem human tissue and animal research to determine the specific nature of neural changes," explains Dr. John Krystal, Editor of Biological Psychiatry and affiliated with both Yale University School of Medicine and the VA Connecticut Healthcare System.

This is where research conducted in animals has provided critical information.
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Contact: Jayne Dawkins
ja.dawkins@elsevier.com
215-239-3674
Elsevier
Source:Eurekalert

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