Your Vestibular System May Protect Your Memory

When we wrote about VOR training -- the vestibulo-ocular reflex drills Jon teaches during squats -- we focused on the practical: two brain pathways, a 90-second protocol, sharper reflexes. But there's a deeper story behind those drills, one that connects your inner ear to your hippocampus, and your balance to your long-term cognitive health.

The research is still emerging. But what's already there is striking enough to take seriously.

The epidemiological signal

Yuri Agrawal's lab at Johns Hopkins has been studying the relationship between vestibular function and cognition for over a decade. Their work, using national health survey data, has consistently found that adults with measured vestibular dysfunction show poorer cognitive performance -- particularly in visuospatial ability and attention -- compared to those with intact vestibular function.

The effect isn't subtle. In studies involving thousands of participants, vestibular impairment tracked alongside cognitive decline even after controlling for age, cardiovascular risk, and hearing loss. More recent work from the same group has linked vestibular loss to increased dementia risk in older populations.

This is epidemiological data -- it shows correlation, not causation. But the correlation is robust enough that researchers have started asking why the inner ear and the memory system might be connected.

Direct wiring: vestibular nuclei to hippocampus

The answer, or at least part of it, comes from neuroanatomy. Paul Smith's lab at the University of Otago in New Zealand has spent years mapping the connections between the vestibular system and the hippocampus. Their findings are striking: the vestibular nuclei in the brainstem have direct and indirect projections to the hippocampus -- the brain region most associated with spatial memory, navigation, and the earliest stages of Alzheimer's pathology.

Smith's group demonstrated that bilateral vestibular loss in animal models leads to measurable hippocampal atrophy and significant spatial memory deficits. The animals could still move. They could still see. But without vestibular input, their hippocampal function degraded.

The mechanism centers on hippocampal place cells -- neurons that fire based on spatial location. These cells need vestibular tonic input to maintain their spatial maps. When that input disappears, the maps degrade. The hippocampus doesn't just lose a signal. It loses the foundation for spatial cognition.

The "use it or lose it" argument

This is where the research converges into a practical question: if vestibular input maintains hippocampal function, does vestibular training protect it?

No one has run that trial yet. There's no randomized controlled study showing that VOR drills prevent cognitive decline. That's important to say clearly.

But the logic follows from what we do know. Balance training reduces fall risk by 23-40% in older adults -- that's Cochrane-reviewed evidence. The vestibular system, like every neural circuit, responds to training with adaptation and to neglect with atrophy. And the hippocampal circuits that degrade earliest in neurodegenerative disease are the same circuits that receive direct vestibular input.

If you're looking for a "use it or lose it" candidate -- a system worth maintaining proactively because the cost of letting it degrade is so high -- the vestibular-hippocampal pathway is a strong one.

Proactive vs. reactive

This is what makes Jon's approach different from clinical vestibular rehabilitation. Clinical rehab is reactive -- you develop vertigo, or suffer a concussion, or fall, and then a therapist prescribes VOR exercises to restore function. The exercises are often the same ones Jon teaches. The difference is timing.

Jon trains these pathways in healthy adults, before anything goes wrong. He treats the vestibular system the way a good coach treats any physical capacity: maintain it, challenge it, build headroom so that when life demands it -- a stumble on uneven ground, a quick dodge on a busy sidewalk, decades of hippocampal wear -- the system has reserves.

He doesn't frame this as medicine. He frames it as maintenance:

"BDNF... We get that in different ways."

— Jon, Session 14

The "different ways" include the catecholamine pathways that vestibular training activates -- norepinephrine, acetylcholine, dopamine -- each a precursor to BDNF production in the hippocampus. BDNF supports synaptic plasticity, the physical basis of learning and memory. It's the same protein that makes "exercise is good for your brain" true, but vestibular training may activate it through a more direct route than a treadmill.

What we're watching

The field is moving. Researchers are beginning to design interventional studies -- testing whether structured vestibular training can preserve cognitive function in aging populations. If those trials confirm what the epidemiology and neuroanatomy suggest, vestibular maintenance could become as standard a recommendation as cardiovascular exercise for brain health.

Until then, the argument is inferential but strong: the circuits exist, the correlations are robust, the mechanism is plausible, and the cost of training is 90 seconds of VOR squats at your desk.

We're not making medical claims. We're following the science to its logical next question -- and training accordingly while we wait for the answer.

This post explores movement coaching concepts. It is not medical advice. Consult a healthcare provider before starting any new exercise program, especially if you have vestibular disorders or cognitive health concerns.