Brain Wiring Protects Cognition as Gray Matter Shrinks — SkimNews
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- Keck School of Medicine of USC researchers found that healthier short-range brain wiring just beneath the cortex cushions cognition against age-related gray matter loss, with language abilities showing the strongest protective effect.
- The study examined brain imaging and cognitive data from 459 adults aged 60 and older living in communities across India, making it among the first to investigate superficial white matter in a community-based population from a low- and middle-income country.
- Using advanced diffusion MRI to measure neurite density and free water in superficial white matter, researchers found that poorer integrity in these local connections amplified the cognitive impact of gray matter loss.
- Data from the Longitudinal Aging Study in India (LASI-DAD) showed the brain-wiring-language link was strongest among participants with no formal education or who lived rurally — over half the population had low literacy and about 60% lived in rural communities.
- The study, published in Alzheimer's & Dementia, was led by first author Yingxu Liu and senior author Leon Aksman, who noted long-term follow-up is needed to determine whether superficial white matter deterioration precedes or follows gray matter loss.
Why it matters: The study of 459 Indian adults aged 60+ — over half with low literacy and 60% rural — identifies superficial white matter as a resilience factor that buffers cognition against gray matter loss, providing a new lens for dementia research in populations historically absent from brain imaging studies.
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