Vestibular rehabilitation therapies (VRT) may help vestibular patients to compensate with vision and proprioception. However, such compensation is not adequate because the brain often needs a reliable reference in order to use visual and somatosensory information for perception of self-motion and spatial orientation. Consequently, many patients with vestibular imbalance fail to compensate, especially those with profound vestibular loss. Even those who respond to VRT may experience constant physical and mental stress due to overreliance on vision and proprioception that can be misleading in busy environments.