Baraniuk, James N · Brain sciences · 2022 · DOI
This review examines a brain region called the midbrain and how it might contribute to post-exertional malaise (PEM)—the worsening of symptoms after activity that happens in ME/CFS. When ME/CFS patients did exercise in a study, their midbrain showed increased activity during mental tasks, while Gulf War Illness patients showed the opposite pattern. The authors suggest that problems in this brain region could explain why ME/CFS patients have trouble with energy, sleep, mood, pain, and temperature control, especially after exertion.
Understanding which brain regions malfunction in ME/CFS is crucial for developing targeted treatments. This review provides a framework linking specific midbrain structures to the hallmark symptom of PEM, offering researchers a biological basis for understanding why ME/CFS patients crash after activity and suggesting potential intervention targets.
This review does not prove that midbrain dysfunction is the primary cause of ME/CFS, only that it may contribute to symptom manifestation. The study infers mechanistic dysfunction from anatomical data and differential activation patterns rather than directly demonstrating causality. Findings require validation through prospective studies with larger sample sizes and direct mechanistic testing.
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 →
The first block is for the primary paper and is the citation you should use in research work. The atlas-snapshot line only applies if you are specifically referring to this atlas’s reading of the paper on the date shown.
Primary citation
Baraniuk, James N (2022). Review of the Midbrain Ascending Arousal Network Nuclei and Implications for Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS), Gulf War Illness (GWI) and Postexertional Malaise (PEM).. Brain sciences. https://doi.org/10.3390/brainsci12020132
BibTeX
@article{mecfsatlas-baraniuk-2022-review-midbrain,
author = {Baraniuk, James N},
title = {Review of the Midbrain Ascending Arousal Network Nuclei and Implications for Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS), Gulf War Illness (GWI) and Postexertional Malaise (PEM).},
journal = {Brain sciences},
year = {2022},
doi = {10.3390/brainsci12020132},
note = {PubMed: 35203896},
url = {https://www.mecfsatlas.com/evidence/baraniuk-2022-review-midbrain},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-30. https://www.mecfsatlas.com/evidence/baraniuk-2022-review-midbrain
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