Nikhil Prasad Fact checked by:Thailand Medical News Team Oct 26, 2026 1 hour, 14 minutes ago
A major brain imaging study involving nearly 82,000 adults has uncovered striking differences in how two neighboring brain regions age, revealing structural changes that may appear years before dementia or Parkinson’s disease is diagnosed.
Oxford researchers identified subtle brain changes associated with dementia and Parkinson’s disease years before
clinical diagnosis.
Researchers from the University of Oxford, UK, including the Oxford Centre for Integrative Neuroimaging and Oxford Parkinson’s Disease Centre, identified the nucleus basalis of Meynert as particularly vulnerable to neurological disease.
Two Brain Regions Age Differently
The investigation analyzed magnetic resonance imaging (MRI) scans from 81,870 UK Biobank participants aged 45 to 87.
Scientists examined two components of the basal forebrain, a brain region involved in memory, attention, and acetylcholine signaling.
The nucleus basalis of Meynert, known as Ch4, showed progressive volume loss throughout adulthood. Meanwhile, the neighboring Ch1–3 region remained relatively stable until approximately age 60, when deterioration accelerated.
Follow-up scans from 2,712 participants confirmed these differing aging patterns.
Brain Changes Appear Before Diagnosis
Importantly, this
Thailand Medical News report highlights evidence that Ch4 abnormalities preceded clinical diagnoses by several years.
Among 126 participants subsequently diagnosed with dementia, Ch4 volume was significantly below expected levels. Their median interval between imaging and diagnosis was 4.6 years.
Similar abnormalities appeared in 70 participants who later developed Parkinson’s disease, with a median interval of 4.1 years.
Compared with healthy individuals, standardized Ch4 volume deviations measured −0.560 for future dementia patients and −0.358 for future Parkinson’s patients.
Both associations remained statistically significant after correction for multiple comparisons.
Strong Links to Neurological Disease
Researchers also identified reduced Ch4 volume in patients with multiple sclerosis, stroke, dementia, and Parkinson’s disease.
In contrast, schizophrenia, bipolar disorder, and recurrent depression showed no statistically significant structural abnormalities in either examined region.
Among 53,479 participants followed for a median of 4.2 years, lower Ch4 integrity independently predicted subsequent dementia and Parkinson’s diagnoses.
These associations persisted after accounting for demographic characteristics, lifestyle factors, genetic susceptibility, and other brain measurements.
Genetic risk scores explained remarkably little variation in basal forebrain structure, suggesting inherited susceptibility alone cannot explain these abnormalities.
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Implications for Earlier Detection
The findings suggest that examining specific basal forebrain structures could eventually improve identification of individuals experiencing early neurodegenerative changes.
However, MRI abnormalities cannot currently establish individual diagnoses, and additional prospective validation is essential before clinical screening applications become realistic.
The study findings were published in the peer-reviewed journal: Not yet published in a peer-reviewed journal.
https://www.medrxiv.org/content/10.64898/2026.10.13.26365385v1
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https://www.thailandmedical.news/articles/alzheimer,-dementia-
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