Vascular reactivity and gray matter shape executive function
In 120 older adults, cerebrovascular reactivity and gray matter volume interacted in parietal and occipital lobes to influence executive function.
Journal of Alzheimer's Disease
In a study of 181 healthy younger adults aged 18 to 34 and 120 older adults aged 60 to 89, researchers evaluated how cerebrovascular reactivity and gray matter volume relate to cognitive aging. The team quantified cerebrovascular reactivity with resting-state functional MRI and gray matter volume using structural MRI across major brain lobes.
Cerebrovascular reactivity and gray matter volume did not correlate across frontal, temporal, parietal, or occipital lobes. However, the two measures interacted significantly to affect executive function in the parietal and occipital lobes. In the occipital lobe, high cerebrovascular reactivity decline linked to poorer executive function regardless of gray matter volume loss. These results indicate that cerebrovascular reactivity can track executive decline beyond structural brain measures alone.
Why it matters
Cognitive aging involves both vascular and structural brain changes. Measuring cerebrovascular reactivity alongside tissue volume provides a clearer picture of the vascular mechanisms that influence executive function during normal aging.
Caveats
The study relied on a cross-sectional design, which cannot establish causality or track changes over time. It was also limited to 120 older participants who were cognitively healthy.
The paper
Beijing Chao-Yang Hospital, Capital Medical University · Capital Medical University
Journal of Alzheimer's Disease · 28 Sep 2026