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Veterans With Gulf War Illness Show Brain Changes Linked to Memory Deficits

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www.ProHealth.com • October 21, 2013


Veterans With Gulf War Illness Show Brain Changes Linked to Memory Deficits. Image credit: FreeDigitalPhotos.net by renjith krishnan
Image credit: FreeDigitalPhotos.net by renjith krishnan

Editor's Comment: There is a marked similarity in symptoms between ME/CFS and GWI. One of the areas in which symptoms overlap is cognitive impairment. This study examines a cognitive problem commonly experienced by people with ME/CFS - poor working memory. Slow performance in cognitive tasks is one of the most well documented cognitive impairments in ME/CFS. Studies like these, which examine this problem in other related illnesses, serve to shed light on the brain changes common to all of them.

Press Release: Association for Psychological Science, October 15, 2013

New research illuminates definitive brain alterations in troops with Gulf War Illness (GWI) thought to result from the exposure to neurotoxic chemicals, including sarin gas, during the first Persian Gulf War.

“More than 250,000 troops, or approximately 25% of those deployed during the first Persian Gulf War, have been diagnosed with Gulf War Illness (GWI). Although medical professionals have recognized the chronic and often disabling illness for almost two decades, brain changes that uniquely identify GWI have been elusive until now,” explained researcher Bart Rypma, principal investigator at the Center for Brain Health at The University of Texas at Dallas.

This study, published in Clinical Psychological Science, a journal of the Association for Psychological Science, is novel in that it confirms GWI deficits in working memory, a critical cognitive function that enables short-term retention of information for higher-level thinking ability.

In addition, brain alterations revealed in the study show a consistent pattern representing a neurobiological marker that could potentially be used to positively identify GWI.

The research team assessed three aspects of working memory: accuracy, speed, and efficiency. Results showed that participants with GWI performed significantly slower and less accurately than matched healthy veterans, and their efficiency decreased with increasing task difficulty.

During these difficult conditions, the participants showed relatively lower levels of activity in prefrontal brain regions which may compromise their ability to implement effective, higher-level thinking strategies in cognitively demanding situations.

“Our results revealed that at the root of cognitive issues in GWI patients are profound working memory deficits that correlate with a unique brain change visible in the fMRI scanner. These results support an empirical link between exposure to neurotoxic chemicals, specifically sarin nerve gas, and cognitive deficits and neurobiological changes in the brain,” said Rypma. “Implementing interventions that improve working memory could have positive effects on many aspects of daily life from the ability to complete a shopping list, match names with faces, all the way to elevating mood.”

“Difficulty remembering has been the most common, unexplained impairment resulting from service in the 1991 Persian Gulf War,” said Robert Haley, co-investigator and Chief of Epidemiology at UT Southwestern Medical Center in Dallas. “This functional MRI study provides the first objective evidence showing the exact malfunctions in the brain’s memory circuits that underlie these chemically induced memory problems.”

The new findings may also have implications for the treatment of several disorders involving similar neural systems, including Alzheimer’s disease.

“Both GWI and Alzheimer’s disease result in profound cognitive impairment and share similar neurochemical underpinnings,” explained the study’s lead author Nicholas Hubbard. “The distinct neural markers associated with cognitive performance and GWI revealed in our study can be useful for future research to objectively measure the efficacy of treatments for GWI as well as other brain disorders related to the same neurotransmitter system, like Alzheimer’s disease.”


For more information about this study, please contact:

Shelly Kirkland at shelly.kirkland@utdallas.edu,  972-883-3221 (office) or 214-676-1223 (mobile)

The article abstract can be found online HERE.

Additional co-authors include: Joanna L. Hutchison and Michael A. Motes of The University of Texas at Dallas and The University of Texas Southwestern Medical Center; and Ehsan Shokri-Kojori, Ilana J. Bennett, and Ryan M. Brigante of The University of Texas at Dallas.

This work was supported by the Friends of Brain Health research endowment (to N. A. Hubbard), the Department of Veterans Affairs (Grant VA549-P-0027 to R. W. Haley), and the National Institutes of Health (Grant 1R01AG029523 to B. Rypma).

Clinical Psychological Science is APS's newest journal. For a copy of the article "Central Executive Dysfunction and Deferred Prefrontal Processing in Veterans With Gulf War Illness" and access to other Clinical Psychological Science research findings, please contact Anna Mikulak at 202-293-9300 or amikulak@psychologicalscience.org. 



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