الفهرس 
Introduction and RationaleOnly 14 pages are availabe for public view
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Abstract
Balance is maintaned by the integration of orientation information from visual vestibular and somatosensory inputs. Under normal fixed surface and visual surround conditions, these three senses provide redundant information about the orientation of the body relative to gravity and the support surface. because of the multiplicity and redundancy of this orientation information, assessing the balance function of patients with complaints of dizziness and/or unsteadiness requires exposing them to altered visual, vestibular, and support surface conditions (Shepard et al, 1998).