White Matter, Vascular Disease, and the Brain We Cannot See

White matter changes, small areas of vascular damage visible on MRI, are among the few structural markers we can observe inside the brain, and the research increasingly shows they matter in specific and predictable ways.

The revised VasCog-2-WSO diagnostic criteria published by the Sachdev-led consortium in JAMA Neurology in 2025, with 70 international experts and three Delphi rounds, confirmed consensus on criteria for preclinical, mild, and major vascular cognitive impairment, alongside guidance on neuroimaging and fluid biomarkers. The World Stroke Organization endorsed these criteria, reflecting global recognition that vascular cognitive impairment is a distinct clinical entity.

A clinical pathological study by Oveisgharan and colleagues from the Rush Alzheimer's Disease Center, published in JAMA Neurology in 2022, found that macroinfarcts in the frontal white matter were the primary driver of faster cognitive decline among participants with vascular pathology but without Alzheimer's disease. Pure vascular cognitive impairment was present in over 40% of the vascular subgroup.

A review by Hosoki and colleagues from the University of New South Wales, published in Nature Reviews Neurology in 2023, examined proteins, peptides, metabolites, lipids, and circulating RNA as potential biomarkers for vascular cognitive impairment. A scalable, validated digital tool like ReCOGnAIze captures the functional expression of these same vascular processes at a stage when intervention is still highly relevant.

A review by Fong and Inouye from Harvard Medical School, published in Nature Reviews Neurology in 2022, identified delirium as an independent risk factor for subsequent dementia and a potentially modifiable pathway. Vascular brain health is not a passive observation. It is an active, intervenable system. If you have a history of high blood pressure, white matter changes on a previous scan, or have been told you have small vessel disease, speak to your doctor about cognitive monitoring as part of your ongoing care plan.