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The neural correlates of fatigue: an exploratory imaginal fatigue provocation study in chronic fatigue syndrome

  • X. Caseras (a1) (a2), D. Mataix-Cols (a2) (a3), K. A. Rimes (a2), V. Giampietro (a4), M. Brammer (a4), F. Zelaya (a4), T. Chalder (a2) and E. Godfrey (a3)...
Abstract
Background

Fatigue is the central symptom in chronic fatigue syndrome (CFS) and yet very little is known about its neural correlates. The aim of this study was to explore the functional brain response, using functional magnetic resonance imaging (fMRI), to the imaginal experience of fatigue in CFS patients and controls.

Method

We compared the blood oxygen level dependent (BOLD) responses of 12 CFS patients and 11 healthy controls to a novel fatigue provocation procedure designed to mimic real-life situations. A non-fatiguing anxiety-provoking condition was also included to control for the non-specific effects of negative affect.

Results

During the provocation of fatigue, CFS patients reported feelings of both fatigue and anxiety and, compared to controls, they showed increased activation in the occipito-parietal cortex, posterior cingulate gyrus and parahippocampal gyrus, and decreased activation in dorsolateral and dorsomedial prefrontal cortices. The reverse pattern of findings was observed during the anxiety-provoking scenarios.

Conclusions

The results may suggest that, in CFS patients, the provocation of fatigue is associated with exaggerated emotional responses that patients may have difficulty suppressing. These findings are discussed in relation to the cognitive-behavioural model of CFS.

Copyright
Corresponding author
*Address for correspondence: Dr X. Caseras, PO 69, Section of Cognitive Neuropsychiatry, Institute of Psychiatry, De Crespigny Park, LondonSE5 8AF, UK. (Email: xavier.caseras@iop.kcl.ac.uk)
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Psychological Medicine
  • ISSN: 0033-2917
  • EISSN: 1469-8978
  • URL: /core/journals/psychological-medicine
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