Boissoneault, Jeff, Sevel, Landrew, Robinson, Michael E et al. · Journal of clinical and experimental neuropsychology · 2018 · DOI
Researchers used brain scans to study what happens in the brain when healthy people remember feeling tired versus happy. They found that fatigue activated different brain regions than happiness did, particularly areas involved in vision and a structure called the globus pallidum. This helps scientists understand the brain basis of fatigue without the complications of studying people who have chronic fatigue syndrome with other medical conditions.
This mechanistic study isolates the brain circuitry of fatigue in healthy controls without confounding comorbidities like depression or pain, providing a foundational understanding of fatigue neural mechanisms relevant to ME/CFS. By identifying specific brain networks associated with fatigue, it offers potential biomarkers and therapeutic targets for investigating fatigue pathophysiology in chronic conditions including ME/CFS.
This study does not demonstrate that ME/CFS fatigue arises from the same brain mechanisms as experimental fatigue in healthy people—ME/CFS involves post-exertional malaise, autonomic dysfunction, and persistent symptoms absent in this acute recall paradigm. The findings are correlational and do not establish causal relationships or explain why these brain regions become dysfunctional in disease states. Small sample size (n=17) and use of memory recall rather than actual fatigue-inducing exercise limits generalizability to real-world fatigue experiences.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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