Why pain emerges when the brain miscalculates distance, depth, and movement, leading to over-bracing and tissue overload.
You misjudge distances. You bump into things. Movement feels uncertain, and your neck, shoulders, or back are constantly tight. If this sounds familiar, the issue may not be your muscles or joints. It may be your visual processing system.
Primary Neurologic Domain: Visual Oculomotor
When visual input is unreliable, secondary compensation often appears in the Cervical and Proprioceptive domains, increasing strain and pain.
Visual processing dysfunction often presents as spatial uncertainty, over-bracing, and visual-motor mismatch:
These experiences reflect neurologic processing issues, not eye problems or structural damage.[2] They are common, measurable, and addressable.
The visual system does more than see: it calculates space, depth, and motion. It tells the brain where objects are, how fast they are moving, and where the body is relative to the environment. Efficient movement depends on accurate visual-spatial processing.
When visual processing is functioning well, movement through space is automatic and confident. When it is impaired, the brain loses its spatial anchor and the body compensates by bracing, guarding, and over-stabilizing.
When visual input becomes unreliable, several patterns emerge:
The body compensates for unreliable vision by creating stiffness. That stiffness protects against spatial miscalculation, but over time, it becomes the source of pain.
When the visual system fails to provide reliable spatial information, the body recruits muscles to compensate. The cervical spine, shoulders, and upper back become chronically overloaded, not because of injury, but because they are working to stabilize a system that should stabilize itself.
Pain in this context is not a signal of damage. It is a signal of overwork: the consequence of muscles substituting for a visual system that can no longer anchor movement in space.
If pain concentrates in the neck, shoulders, or upper back and imaging looks normal, a neurologic MSK evaluation can reveal whether visual processing dysfunction is the missing link.
Visual processing dysfunction may be primary (meaning the visual system itself is impaired) or it may emerge secondarily from other neurologic limitations.
Common upstream drivers include vestibular instability and cerebellar timing deficits. When these systems are impaired, visual processing degrades and spatial accuracy suffers as a result.
Treating muscle tightness without restoring visual processing often provides temporary relief, but the pattern returns.
Imaging evaluates structure (bones, discs, tendons, and ligaments). Strength tests measure output (how much force a muscle can produce). But visual processing dysfunction lives in the spatial calculation system: it affects how the brain maps the environment and coordinates movement through space.
A normal MRI and strong muscles can coexist with a very real visual processing problem. This is why chronic neck and shoulder pain persists for many people despite reassuring test results.
At PPC, evaluation is constraint-based and function-focused:
The goal is to determine whether visual processing dysfunction is driving compensatory bracing and overload, and what needs to be addressed first.
When visual processing is restored, the body no longer needs to brace for spatial uncertainty. Muscles relax. Movement becomes confident. And pain often resolves as tissues are no longer chronically overloaded.
Confidence returns when the brain trusts its spatial map. Stiffness releases when bracing is no longer needed.
If pain concentrates in the neck, shoulders, or upper back and movement feels uncertain or visually demanding, a clinician-led neurologic and musculoskeletal evaluation can help determine whether visual processing dysfunction is driving the problem, and what to address first.
Schedule a comprehensive evaluation to identify the root cause of your symptoms.
Supporting literature for this article. View full Works Cited
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.
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.
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.
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.