Effect of Vestibular Perceptual Learning on Vestibular Thresholds and Balance

Inclusion Criteria:

* Must be able to stand
* No leg or foot amputations
* No lower limb braces
* Not currently feeling dizzy/lightheaded
* Not currently pregnant by self-report
* Weight \<= 275 pounds

Exclusion Criteria:

* Severe head trauma or traumatic brain injury
* Any vestibular disorder (e.g., Meniere's Disease, Vestibular Migraine, Unresolved benign paroxysmal positional vertigo (BPPV), Vestibular hypofunction, except that due to aging, PPPD) as assessed by a Vestibular OtoNeurologist and Neurotologist using clinical diagnostic tests described in proposal plus any additional clinical evaluations they identify
* History of seizures
* Neurologic illness or condition determined by an Otoneurologist known to impact vestibular or balance function(e.g., stroke, neurodegenerative disorders, demyelinating illness)
* Major psychiatric (e.g., panic disorder, psychosis, etc.) disorder
* Any of the following eye diseases or conditions: amblyopia (or "lazy eye") or history of amblyopia, diagnosis of age-related macular degeneration, retina dystrophy, glaucoma, cataracts, or any other eye condition that limits vision to worse than 20/40
* Recent (\<6 months) orthopedic injuries of the lower extremities (e.g., plantar fasciitis, ankle, knee or hip injury, back strain/herniated disc, …).
* Upper extremity injuries requiring current sling immobilization
* Recent surgery
* Any other severe health problem (heart disease, pulmonary disease, cancer, etc.).
* Vision in both eyes must be better than 20/40 with best correction
* Due to the potential for nausea with some of the motion stimuli, and to protect fetus and mother, pregnant women will also be excluded from this study
* Since every possible exclusionary factor cannot be predicted, additional exclusion criteria may be required