Human Visual and Vestibular Motion Perception Study

The purpose this study is to measure sensitivity to visual and vestibular or balance motion. It is hoped that the results may help researchers better understand how aging and disease affect motion perception.

Inclusion Criteria: Healthy subjects: * general good health Vestibular Disease patients: * general good health * specific unilateral or bilateral vestibular loss Exclusion Criteria: Healthy subjects: * subjects who are institutionalized or otherwise not self-sufficient. * enduring sequelae due to diseases of the nervous system, eyes, ears, head and neck, and limbs, except for changes commensurate with normal aging (e.g. presbyacusic hearing loss, mild cataract, etc.). * abnormal cognitive function, which if in question can be determined as a score of \65 * abnormal binocular stereo-acuity or visual fields. * any defects in cranial nerve, oculomotor, cerebellar/coordination, and somatosensory functions. * any abnormal oculomotor and vestibular function (caloric tests) Vestibular Disease patients: * Inability to perform the study tasks due to sensory, motor, or postural limitations