Alzheimer’s changes partly account for links to poorer thinking
Alzheimer’s changes statistically accounted for 13–29% of small-artery thickening’s links to poorer thinking, versus 64–91% for amyloid protein buildup in brain vessels.
Limit: Alzheimer’s changes could precede vascular damage, reversing the assumed mediation pathway
Edited by Boris Djordjevic · AgingResearch.News
An observational autopsy study examined 1,269 people who died at an average age of 84.3, comparing brain findings after death with their last cognitive assessment. Women made up 43.3% of the group, 94.7% were White, and 60.2% had dementia at their last assessment. Researchers analyzed memory, language and executive function—the skills used to plan and manage tasks—while accounting for age, sex, education and a genetic risk factor for Alzheimer’s.
More severe thickening of small artery walls was associated with poorer performance in all three areas. So was amyloid protein buildup in brain blood vessel walls. Statistical models estimated that Alzheimer’s-related brain changes accounted for part of both associations, especially those involving amyloid buildup. Small-artery thickening remained associated with poorer cognition after the models accounted for Alzheimer’s changes.
Why it matters
Blood vessel disease and Alzheimer’s-related changes often coexist in aging brains. Understanding their overlapping links to cognition may help guide research into preventing cognitive impairment.
Caveats
These observational models cannot establish cause and effect or the order in which the brain changes developed. The group was predominantly White and mostly had dementia, limiting how broadly the results apply.
- Alzheimer's disease neuropathologic change
- Arteriolosclerosis
- Atherosclerosis
- Cerebral amyloid angiopathy
- Cerebral infarcts and lacunes
- Humans
The paper
University of Kentucky; Stanford Medicine
Brain, Oct 29, 2026, Open access