NVC may be a potential biomarker for cognitive dysfunction in asymptomatic CSVD, and optimizing NVC and glymphatic function could help prevent cognitive impairment in asymptomatic CSVD.
Key Findings
Results
CBF/fALFF ratios in the precuneus and bilateral angular gyrus were linked to the DTI-ALPS index in asymptomatic CSVD patients.
Study included 231 asymptomatic cerebral small vessel disease (CSVD) patients
Neurovascular coupling (NVC) was assessed via voxel-wise ratios of cerebral blood flow to fractional amplitude of low-frequency fluctuations (CBF/fALFF)
Glymphatic function was assessed via the diffusion tensor imaging analysis along the perivascular space (DTI-ALPS) index
Partial correlation analyses were used to identify these regional associations
Results
Precuneus CBF/fALFF ratio was positively correlated with episodic memory in asymptomatic CSVD patients.
The precuneus was one of the specific regions where NVC metrics showed cognitive associations
The association was identified using partial correlation and linear regression analyses with covariates including demographics, vascular risks, and CSVD neuroimaging markers
Episodic memory was one of the cognitive domains assessed in the study
Results
CBF/fALFF spatial correlation coefficients were associated with executive function in asymptomatic CSVD patients.
Whole-brain spatial correlation between CBF and fALFF maps was used as an additional NVC metric
Executive function was the cognitive domain linked to this whole-brain NVC measure
Linear regression analyses controlled for demographics, vascular risks, and CSVD neuroimaging markers
Results
The DTI-ALPS index mediated the association between CBF/fALFF correlation coefficients and executive function.
Mediation analysis was conducted with the DTI-ALPS index as the mediator between NVC (CBF/fALFF correlation coefficients) and executive function
The mediation model was adjusted for demographics, vascular risks, and CSVD neuroimaging markers
This finding suggests glymphatic clearance plays an intermediary role in the NVC–executive function relationship
This is described as a key mechanistic finding linking neurovascular coupling to cognitive outcomes via the glymphatic pathway
Methods
Whole-brain NVC was assessed using two complementary methods: voxel-wise CBF/fALFF ratios and spatial correlation between CBF and fALFF maps.
CBF measured cerebral blood flow as the vascular component of NVC
fALFF (fractional amplitude of low-frequency fluctuations) served as a proxy for neural activity
Voxel-wise ratios provided regional specificity while spatial correlation provided a global NVC estimate
The sample consisted of 231 asymptomatic CSVD patients
What This Means
This research suggests that in people who have cerebral small vessel disease (a condition involving damage to small blood vessels in the brain) but no obvious symptoms, the coordination between brain activity and blood flow — called neurovascular coupling (NVC) — is meaningfully connected to how well the brain clears waste and how well people think and remember. The researchers measured NVC using brain imaging that compared blood flow to neural activity patterns, and measured the brain's waste-clearance system (the glymphatic system) using a special type of MRI analysis. They found that NVC in specific brain regions was linked to both memory and executive function (the ability to plan, focus, and make decisions).
Importantly, the study found that the glymphatic system — the brain's drainage network that removes toxic waste products during sleep — partially explains the relationship between NVC and executive function. In other words, when blood flow and brain activity are well-coordinated, the glymphatic system appears to work better, and this in turn supports better cognitive performance. This chain of relationships was observed even after accounting for factors like age, vascular risk factors, and visible brain damage on imaging.
This research suggests that measuring neurovascular coupling could serve as an early marker for cognitive risk in people with small vessel disease before symptoms appear. It also implies that interventions aimed at improving blood flow coordination and glymphatic clearance — such as those targeting sleep quality or vascular health — might help prevent cognitive decline in this population. The study adds to growing evidence that the brain's blood vessels and its waste-clearance system work together to support thinking and memory.
Chen J, Wang Y, Chen X, Chen C, Shi W, Ding J. (2026). Impact of neurovascular coupling and glymphatic function on cognitive function in asymptomatic cerebral small vessel disease.. Frontiers in neurology. https://doi.org/10.3389/fneur.2026.1909936