Nikhil Prasad Fact checked by:Thailand Medical News Team Sep 25, 2026 56 minutes ago
Researchers have identified a combined brain-and-cognition pattern that distinguishes people with Long COVID from healthy controls, pointing toward subtle neuroinflammatory and vascular changes rather than widespread neurodegeneration.
Advanced MRI and cognitive testing linked Long COVID symptoms with subtle brain changes consistent
with neuroinflammatory and vascular processes
The study involved 109 participants: 77 with Long COVID and 32 controls. None had experienced severe acute COVID requiring intensive care or mechanical ventilation. Participants underwent cognitive testing and quantitative MRI.
Cognition Drives the Difference
The researchers created a “brain–cognition axis” combining cognitive and MRI measurements. This integrated measure significantly separated the Long COVID and control groups.
Cognitive features accounted for 72.6% of the separation, while MRI findings contributed 27.4%. Memory was the strongest individual factor, accounting for 54.8% of the total difference. Memory and executive-function scores were about 0.8 standard deviations lower in Long COVID.
For this
Thailand Medical News report, the important finding is that imaging added biological information that cognitive testing alone could not capture.
MRI Signals Point to Subtle Brain Changes
The strongest imaging signals involved increased isotropic free water and reduced neurite density. Higher free water may be consistent with inflammatory edema, glial activation or blood-brain barrier leakage, while lower neurite density may reflect subtler changes in dendritic and other unmyelinated tissue.
The affected patterns extended across dorsal attention, frontoparietal, salience and limbic networks, as well as thalamic, striatal and cerebellar regions.
By contrast, MRI relaxometry measures sensitive to myelin, iron and the biochemical environment contributed relatively little. The researchers said this pattern is more compatible with chronic low-grade neuroinflammatory and microvascular processes than extensive demyelination or major tissue loss.
Brain Pattern Tracks Symptom Burden
Higher brain–cognition axis scores were also associated with greater overall Long COVID symptom burden. Associations were seen across respiratory, systemic and neurological/sensory-autonomic symptoms, with partial R² values of approximately 0.10 to 0.18. No single symptom category clearly dominated. The cross-sectional study cannot establish causation and requires independent validation.
Research Institutions
Charles University and General University Hospital; Czech Technical University in Prague; University of Minnesota; Masaryk University and University Hospital Brno; Central European Institute of Technology.
Conclusion
The findings suggest that Long COVID-related cognitive difficulties may accompany diffuse
, measurable brain microstructural changes, with immune and vascular mechanisms providing a plausible explanation that now requires longitudinal confirmation and independent replication.
The study findings were published in the peer reviewed journal: Brain Communications.
https://academic.oup.com/braincomms/article/8/5/fcag344/8818113
Read Also:
https://www.thailandmedical.news/articles/coronavirus
https://www.thailandmedical.news/articles/long-covid
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