Understanding the sensory conflict that makes busy environments unbearable after concussion.
Grocery stores are overwhelming. Scrolling on your phone makes you nauseous. Being a passenger in a car feels wrong. This isn't anxiety, it's visual vestibular mismatch, one of the most common and treatable causes of persistent post concussion symptoms.
Primary Neurologic Domain: Visual–Oculomotor
When visual–oculomotor processing becomes inefficient after concussion, secondary compensation often appears in the Vestibular and Frontal domains—which is why busy environments, reading, and sustained focus become exhausting.
Your brain uses three systems to know where you are in space: your eyes (visual system), your inner ear (vestibular system), and your body position sensors (proprioception).[1] When these systems send conflicting information, your brain struggles to create a coherent picture of reality.
After concussion, the calibration between these systems can be disrupted. Your eyes say one thing, your inner ear says another. The result is a constant, low grade sense of disorientation that spikes in challenging environments.
Visual vestibular mismatch symptoms often appear in specific situations:
These symptoms are measurable and addressable. The first step is identifying the specific mismatch pattern.
Standard vestibular testing examines each system in isolation. The inner ear is tested separately from the eyes. But the problem isn't with either system alone—it's with how they integrate.[2][3] Standard testing can come back completely normal while the integration failure persists.
Standard vestibular and vision tests evaluate each system in isolation. Visual vestibular mismatch is a problem of integration, not of either system alone, which is why it is routinely missed by conventional workups.
When the visual–oculomotor system is inefficient, other neurologic domains compensate. The Frontal system works harder to maintain focus and suppress distractions, leading to cognitive fatigue and brain fog. Meanwhile, the Autonomic system may become dysregulated from chronic sensory conflict—contributing to headaches, nausea, and exercise intolerance.
Our evaluation specifically challenges the integration between visual and vestibular systems. We test how your brain handles sensory conflict—situations where your eyes and inner ear are deliberately given different information.
This reveals the specific patterns of mismatch and guides targeted treatment.
Treatment involves carefully dosed exercises that retrain your brain to properly integrate conflicting sensory information.[4][5] This must be done gradually, as too much challenge too soon can trigger symptom flares and slow progress.
The goal is to rebuild the brain's ability to handle sensory conflict without triggering symptoms. Most patients see meaningful improvement within weeks of targeted intervention.
Many people with visual vestibular mismatch develop avoidance strategies. They stop going to stores, limit screen time, always drive instead of riding as a passenger. These adaptations reduce symptom exposure but don't address the underlying problem.
You don't have to avoid the activities that trigger symptoms. With proper treatment, your brain can relearn how to handle these situations normally.
At PPC, determining whether visual–oculomotor dysfunction is primary—or compensatory—helps guide what to address first in concussion recovery. Learn more about our vestibular rehabilitation services for treating visual-vestibular mismatch.
Schedule a comprehensive evaluation to identify the root cause of your symptoms.
Supporting literature for this article. View full Works Cited
Batini, C., Buisseret, P., Lasserre, M. H., & Toupet, M. (1985). Does proprioception of the extrinsic eye muscles participate in equilibrium, vision and oculomotor action? Annales d’oto‑laryngologie et de chirurgie cervico‑faciale, 102(1), 7–18.
This classic review shows that proprioceptive signals from the extra-ocular muscles project to the brain stem and cerebellum and that imbalances can provoke equilibrium disturbances and nystagmus. It underscores the PPC principle that eye-muscle alignment and proprioception are key components of postural control.
Hoppes, C. W., Sparto, P. J., Whitney, S. L., Furman, J. M., & Huppert, T. J. (2018). Changes in cerebral activation in individuals with and without visual vertigo during optic flow: A functional near-infrared spectroscopy study. NeuroImage: Clinical, 20, 655–663. https://doi.org/10.1016/j.nicl.2018.08.034
Using functional near-infrared spectroscopy, this study found that individuals with visual vertigo display reduced activation in frontal cortical regions when viewing optic-flow stimuli. The findings support the PPC view that visual dependence alters cortical processing and justify the use of optic-flow habituation to rebalance sensory inputs.
Allen, J. W., Trofimova, A., Ahluwalia, V., Smith, J. L., Abidi, S. A., Peters, M. A. K., … & Gore, R. K. (2021). Altered processing of complex visual stimuli in patients with postconcussive visual motion sensitivity. American Journal of Neuroradiology, 42(5), 930–937. https://doi.org/10.3174/ajnr.A7007
In concussed patients with visual motion sensitivity, functional MRI revealed selectively increased activation in primary vestibular and inferior frontal regions, and the degree of activation correlated with symptom severity. This aligns with the PPC framework’s emphasis on multisensory re-weighting and supports interventions that restore balance between visual and vestibular inputs.
Choi, S.-Y., Choi, J.-H., Oh, E. H., Oh, S.-J., & Choi, K.-D. (2021). Effect of vestibular exercise and optokinetic stimulation using virtual reality in persistent postural-perceptual dizziness. Scientific Reports, 11, 14437.
This randomized trial found that customized vestibular exercises delivered via virtual reality improved dizziness handicap, activities of daily living, visual-vertigo scores and gait (TUG) in PPPD patients. Additional optokinetic stimulation benefitted only those with severe visual vertigo, underscoring the PPC principle that carefully titrated visual motion exposure helps rebalance sensory weighting.
Mucci, V., Meier, C., Bizzini, M., Romano, F., Agostino, D., Ventura, A., et al. (2019). Combined optokinetic treatment and vestibular rehabilitation to reduce visually induced dizziness in a professional ice hockey player after concussion: A clinical case. Frontiers in Neurology, 10, 1200.
In this case report a concussed ice-hockey player with visually induced dizziness underwent a 5-day program combining vestibular/ocular-motor training with rotating-disc optokinetic exposure. Symptoms decreased throughout treatment and he returned to sport 15 days after the last session, remaining symptom-free at three months. The success of this multimodal therapy illustrates the PPC approach of integrating vestibular, postural and visual therapies to recalibrate sensory processing.
Keshavarz, B., Riecke, B. E., Hettinger, L. J., & Campos, J. L. (2015). Vection and visually induced motion sickness: How are they related? Frontiers in Psychology, 6, 472. https://doi.org/10.3389/fpsyg.2015.00472
This review explains that visually induced motion sickness results from mismatches between visual, vestibular and somatosensory inputs. It emphasizes that poor postural control and optokinetic eye movements can exacerbate symptoms, reinforcing the PPC principle that harmonizing sensory inputs and improving postural stability can reduce dizziness.
Wibble, T., Södergård, U., Träisk, F., & Pansell, T. (2020). Intensified visual clutter induces increased sympathetic signalling, poorer postural control, and faster torsional eye movements during visual rotation. PLoS ONE, 15(1), e0227370. https://doi.org/10.1371/journal.pone.0227370
Healthy participants exposed to high-intensity rotating visual clutter showed larger ocular torsion velocities and increased pupil size and body sway. These findings demonstrate that visual environments can drive autonomic responses and destabilize posture, supporting PPC-guided interventions that modulate visual stimuli to recalibrate visuo-vestibular-proprioceptive integration.
Luo, H., Wang, X., Fan, M., Deng, L., Jian, C., & Wei, M. et al. (2018). The effect of visual stimuli on stability and complexity of postural control. Frontiers in Neurology, 9, 48. https://doi.org/10.3389/fneur.2018.00048
This study compared eyes-closed, eyes-open, and optokinetic virtual reality scenes. The eyes-open condition produced the lowest center-of-pressure velocity, variability and complexity, while roll-axis optokinetic scenes yielded the highest values. These results show that visual motion can destabilize posture and highlight the importance of targeted habituation and neuromuscular training—key elements of the PPC framework.