Author: Melodie de Jager
Affiliation: Mind Moves Institute
Date: November 2025
Abstract
Emerging evidence implicates dysfunction of the vestibular system in cognitive impairment, mild cognitive impairment (MCI), dementia, and particularly Alzheimer’s disease (AD). This review synthesises recent epidemiological, clinical‐physiological and neurobiological findings on the vestibular-cognitive axis. We examine (1) vestibular anatomy and its connections to brain systems relevant for cognition; (2) epidemiological associations between vestibular disorders and dementia/AD; (3) physiological studies of vestibular function in MCI/AD; (4) plausible mechanisms linking vestibular dysfunction to neurodegeneration; and (5) therapeutic and research implications.
Findings demonstrate that vestibular impairment is significantly associated with an elevated risk of dementia and Alzheimer’s disease, a relationship plausibly mediated by disruptions within hippocampal and spatial-navigation networks. Consequently, the vestibular system may constitute a modifiable risk factor and an emerging therapeutic target in the prevention and management of cognitive decline.
1. Introduction
Dementia and Alzheimer’s disease (AD) represent pressing public health challenges, with rising prevalence due to aging populations worldwide. While classical research on AD has focused primarily on amyloid‑β and tau pathology, growing evidence highlights the contribution of sensory and motor systems to cognitive decline. Among these, the vestibular system, responsible for maintaining balance, gaze stability, and spatial orientation, has emerged as a potentially significant, yet underexplored, factor influencing cognitive trajectories.
From a developmental perspective, De Jager, Efimov, and Efimova (2020) emphasise that the human brain is engaged in a continuous negotiation with gravity from the earliest stages of life, mediated by the vestibular apparatus. Early disruptions in vestibular‑gravity integration may compromise sensory processing, postural control, and cognitive efficiency, potentially reducing lifelong cognitive reserve. Such developmental vulnerabilities may render individuals more susceptible to later‑life neurodegenerative processes, including AD (De Jager et al., 2020).
Recent epidemiological, clinical, and neurobiological studies indicate that vestibular dysfunction is associated with increased risk of mild cognitive impairment (MCI), dementia, and AD (Lin et al., 2025; Koriath et al., 2025; Aedo‑Sanchez et al., 2024). Vestibular impairment may exacerbate hippocampal atrophy, compromise spatial navigation, and contribute to declines in executive function and attention. Moreover, vestibular deficits may indirectly influence cognition through increased fall risk, mobility limitations, and consequent reductions in social engagement.
This review synthesises emerging findings on the vestibular–cognitive axis, integrating evidence from anatomical, physiological, and epidemiological perspectives. We examine (1) vestibular anatomy and its connections to brain systems relevant for cognition; (2) epidemiological associations between vestibular disorders and dementia/AD; (3) physiological studies of vestibular function in MCI and AD; (4) plausible mechanisms through which vestibular dysfunction may contribute to neurodegeneration; and (5) translational, therapeutic, and research implications. By conceptualising vestibular impairment as both a biomarker and a potentially modifiable factor in cognitive decline, this review seeks to guide future research priorities and inform clinical strategies for early detection and intervention.
2. The Vestibular System and Cognitive Brain Networks
2.1 Anatomy and Function
The vestibular system is a complex sensory apparatus integrating both peripheral and central components to maintain balance, gaze stability, and spatial orientation.
The peripheral vestibular apparatus, located in the inner ear, comprises the semicircular canals (detecting angular acceleration) and the otolith organs (detecting linear acceleration). Signals travel via the vestibular nerve to the vestibular nuclei in the brainstem, which relay information to the cerebellum, thalamus, and higher-order cortical regions, including the parieto‑insular vestibular cortex, hippocampus, and posterior parietal cortex (Baloh & Halmagyi, 1996; Adams & Victor, 2021; Hall, 2021).
Baloh and Halmagyi (1996) describe the vestibular system as “comprising both peripheral and central components: the peripheral vestibular apparatus, including the semicircular canals and otolith organs within the inner ear, detects angular and linear acceleration, while the central vestibular pathways, extending through the vestibular nuclei, cerebellum, thalamus, and cortical regions, integrate these signals to maintain balance, gaze stability, and spatial orientation”. This definition aligns with developmental perspectives, which highlight the vestibular system’s role in negotiating gravitational forces and supporting early postural and cognitive development (De Jager et al., 2020).
Similarly, Adams and Victor’s Principles of Neurology notes that “the vestibular system encompasses both peripheral and central structures … the peripheral vestibular apparatus detects head movements through the semicircular canals and otolith organs, while the central vestibular pathways – including the vestibular nuclei, cerebellum, thalamus, and cortical vestibular areas—process and integrate this input to coordinate posture, equilibrium, and spatial perception” (Adams & Victor, 2021).
Guyton and Hall’s Textbook of Medical Physiology further defines the system as “a peripheral sensory apparatus in the labyrinth of the inner ear and central neural pathways that extend through the brainstem, cerebellum, and cortical regions, together enabling balance, coordinated eye movements, and spatial awareness” (Hall, 2021).
From a developmental perspective, De Jager et al. (2020) posits that an insufficient functional relationship with gravity, via the peripheral and central vestibular system, may delay developmental milestones, compromise sensory integration, and reduce cognitive efficiency. Children with learning or behavioural difficulties often exhibit poor postural control and vestibular integration, which redirects cognitive resources away from higher-order functions toward maintaining bodily equilibrium. This developmental model underscores the vestibular system’s lifelong influence on cognitive reserve, offering a mechanistic link to vulnerability in later-life dementia.
These interconnected peripheral and central circuits underpin vestibulo-ocular reflexes, postural control, and spatial navigation, functions increasingly recognised as essential for higher cognitive functions.
3. Epidemiological and Clinical Evidence
- Research by Harun et al. (2016) and more recent studies such as Alahmari et al. (2025) show that people diagnosed with mild cognitive impairment (MCI) or Alzheimer’s disease (AD) often exhibit measurable deficits in vestibular function compared to cognitively healthy controls.
- These vestibular deficits include abnormalities in the vestibulo-ocular reflex (VOR), impaired balance, and reduced spatial orientation.
- The vestibular system, responsible for maintaining balance and spatial awareness, shares neural connections with brain regions critical for memory and navigation, particularly the hippocampus and entorhinal cortex.
- Therefore, dysfunction in this system may either reflect or exacerbate neurodegenerative changes in these regions.
- Clinically, this means that vestibular screening could serve as an early marker for cognitive impairment and help identify individuals at risk of progressing to dementia.
- Large-scale, longitudinal cohort studies (Lin et al. 2025; Koriath et al., 2025) have extended earlier clinical observations by examining entire populations over time.
- These studies found that individuals with peripheral vestibular disorders (e.g., benign paroxysmal positional vertigo, vestibular neuritis, or bilateral vestibulopathy) had a significantly elevated hazard ratio for developing dementia and AD.
- This suggests a temporal relationship where vestibular dysfunction often precedes cognitive decline, not merely co-occurs with it.
- Mechanistically, chronic vestibular deficits can lead to reduced sensory input to brain regions involved in spatial cognition and navigation, potentially accelerating hippocampal atrophy.
- These epidemiologic findings strengthen the case for considering vestibular health as a modifiable risk factor in dementia prevention strategies.
- The study by Bigelow et al. (2016) highlighted that vestibular dysfunction has broader functional consequences beyond balance control.
- Individuals with impaired vestibular function show higher fall rates, slower gait speed, and greater difficulty with activities of daily living.
- Such mobility limitations can lead to reduced physical activity and social engagement, both of which are known risk factors for accelerated cognitive decline.
- Furthermore, repeated falls or fear of falling can contribute to psychological distress and functional dependence, compounding cognitive vulnerability.
- Thus, vestibular impairment may contribute to cognitive decline both directly (through shared neural pathways) and indirectly (through its impact on mobility, independence, and activity levels).
Collectively, these findings support a growing recognition that the vestibular system is deeply intertwined with cognitive health. Vestibular dysfunction may serve as:
- An early biomarker of neurodegeneration,
- A potential contributor to hippocampal and spatial memory impairment, and
- An intervention target, since improving vestibular function (e.g., through vestibular rehabilitation) might help preserve mobility and slow cognitive decline.
4. Mechanisms Associating Vestibular Dysfunction and Dementia
Emerging evidence suggests that vestibular impairment contributes to cognitive decline through multiple interacting mechanisms.
- Hippocampal Pathway: Reduced vestibular input leads to hippocampal atrophy and spatial-navigation deficits—core features of early AD (Koriath et al., 2025).
- Cognitive Reserve: Increased attentional demands for balance may diminish cognitive resources (Smith et al., 2020).
- Shared Pathology: Vascular and neuroinflammatory mechanisms may simultaneously impair vestibular and cortical structures (Aedo-Sanchez et al., 2024).
- Indirect Pathways: Vestibular loss → falls → trauma and isolation → accelerated decline (Alahmari et al., 2025).
Integrating a developmental perspective, early-life vestibular‑gravity misalignment may diminish cognitive reserve, establishing a lifespan vulnerability framework. Poor vestibular integration in childhood imposes persistent cognitive load and may predispose individuals to accelerated cognitive decline when compounded by age-related neuropathology (De Jager et al., 2020). Thus, vestibular dysfunction represents both a marker of neural vulnerability and a potential modifiable contributor to dementia risk.
The peripheral vestibular apparatus projects to vestibular nuclei, cerebellum, and thalamus, which relay to hippocampal and parietal cortical regions. Disruption leads to impaired spatial orientation and memory.
Three routes: (1) direct neural degeneration, (2) an indirect physical or fall-related pathway,
(3) shared vascular–inflammatory pathology, are illustrated in Figure 2, which presents a conceptual model of vestibular dysfunction and dementia.
5. Clinical and Research Implications
Vestibular testing (VEMPs, vHIT, posturography) may provide early biomarkers of cognitive decline. Vestibular rehabilitation and balance training show promise as low-cost interventions, particularly in low- and middle-income contexts (Aedo-Sanchez et al., 2024).
6. Limitations and Future Directions
Most evidence is observational; confounding by hearing loss and vascular factors remains. Objective vestibular assessment is underused outside specialist centers. Future priorities include longitudinal mechanistic imaging and interventional trials testing whether improving vestibular function mitigates cognitive decline.
Future research may further investigate the possibility of ADD and ADHD as potential early markers of cognitive underdevelopment or cognitive decline.
7. Conclusion
Converging evidence indicates that vestibular dysfunction is significantly associated with dementia and Alzheimer’s disease, likely mediated through hippocampal and spatial-navigation pathways. Recognition of this relationship positions the vestibular system as both a biological marker of early cognitive vulnerability and a modifiable therapeutic target for dementia prevention.
References
Adams, R. D., Victor, M., Ropper, A. H., Samuels, M. A., & Klein, J. P. (2021). Adams and Victor’s Principles of Neurology (12th ed.). McGraw-Hill Education.
Aedo-Sanchez, C., Riquelme-Contreras, P., Henríquez, F., & Aguilar-Vidal, E. (2024). Vestibular dysfunction and its association with cognitive impairment and dementia. Frontiers in Neuroscience, 18, 1304810. https://doi.org/10.3389/fnins.2024.1304810
Alahmari, K., & Alshehri, S. (2025). Diagnostic utility of vestibular markers in identifying mild cognitive impairment and early Alzheimer’s disease in older adults. Journal of Clinical Medicine, 14 (13), 4544. https://doi.org/10.3390/jcm14134544
Baloh, R. W., & Halmagyi, G. M. (1996). Disorders of the Vestibular System. Oxford University Press.
Bigelow, R. T., Semenov, Y. R., DuLac, S., & Agrawal, Y. (2016). Vestibular function and spatial cognition in older adults. Journal of Gerontology: Series A, 71(2), 243–249. https://doi.org/10.1093/gerona/glv154
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