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Probing the Working Memory System in Chronic Fatigue Syndrome: A Functional Magnetic Resonance Imaging Study Using the n-Back Task

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By X Caseras, et al. • www.ProHealth.com • November 15, 2006


Journal: Psychosomatic Medicine. 2006 Nov 1; [E-publication ahead of print] Authors and affiliations: Caseras X, Mataix-Cols D, Giampietro V, Rimes KA, Brammer M, Zelaya F, Chalder T, Godfrey EL. Unitat de Psicologia Medica, Institut de Neurociencies, Universitat Autonoma de Barcelona, Barcelona, Spain (Caseras.); and Divisions of Psychological Medicine and Psychiatry, Psychology, and Center for Neuroimaging Sciences, King's College London, Institute of Psychiatry, London, UK. PMID: 17079703

Objective: Up to 90 percent of patients with Chronic Fatigue Syndrome (CFS) report substantial cognitive difficulties. However, objective evidence supporting these claims is inconsistent. The present functional magnetic resonance imaging study examined the neural correlates of working memory in patients with CFS compared with controls.

Methods: Seventeen patients with CFS and 12 healthy control subjects were scanned while performing a parametric version of the n-back task (0-, 1-, 2-, and 3-back).

Results: Both groups performed comparably well and activated the verbal working memory network during all task levels. However, during the 1-back condition, patients with CFS showed greater activation than control subjects in medial prefrontal regions, including the anterior cingulate gyrus. Conversely, on the more challenging conditions, patients with CFS demonstrated reduced activation in dorsolateral prefrontal and parietal cortices. Furthermore, on the 2- and 3-back conditions, patients but not control subjects significantly activated a large cluster in the right inferior/medial temporal cortex. Trend analyses of task load demonstrated statistically significant differences in brain activation between the two groups as the demands of the task increased.

Conclusions: These results suggest that patients with CFS show both quantitative and qualitative differences in activation of the working memory network compared with healthy control subjects. It remains to be determined whether these findings stay stable after successful treatment.




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