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News
Even as the brain loses gray matter with age, its local "wiring" may help keep thinking sharp. A new USC study found that healthier superficial white matter — the short-range nerve fibers just beneath the brain's surface — was linked to better language skills and softened the cognitive blow of gray matter loss. The findings hint at a new target for understanding and potentially preserving brain health in older adults.
We know gray matter shrinks as we get older — but a new study suggests that's not the whole story. Researchers at USC's Keck School of Medicine found that the brain's superficial white matter (the short-range "local roads" connecting nearby brain regions just beneath the surface) may act as a buffer against the cognitive effects of gray matter loss. The study, published in Alzheimer's & Dementia, analyzed brain imaging and cognitive tests from 459 adults aged 60 and older in India.
People with healthier superficial white matter performed better on language tasks and showed a weaker link between gray matter loss and cognitive decline — suggesting that good local brain connectivity may offer a degree of cognitive resilience. Notably, this protective association was even more pronounced among people with no formal education or those living in rural areas.
Key Takeaways:
Why it matters: This research reframes how we think about brain aging — it's not just about how much gray matter you lose, but also about the health of the wiring around it. That opens new doors for identifying who is most at risk for cognitive decline and, potentially, new targets for intervention.
