Subjects participating in the study will be expected to wear a custom-made retainer-like device and perform movements to test their balance. If a patient is determined to be a suitable subject, the sensitivity profile on the palate of the patient will be measured. After an EquiCue™ intraoral device is custom made, the patient will be asked to fit the device inside the mouth, and verify the basic functionality of the device by identifying direction, perceived intensity, and sensory characteristics of stimuli from the device. The subject will then go through 3-4 sessions of training and testing in which the subject tries to associate the feedback with head movement and to integrate the feedback with other senses to achieve a better spatial orientation and balance. The improvement in balance and gait with the device will be evaluated by using standard tests on balance platforms (Computerized Dynamic Posturograpy) and Dynamic Gait Index. Tests will be made without wearing the device at the beginning and wearing the device at the end of each training session.