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In two experiments, we investigated the stabilizing influence of vision on human upright posture in real and virtual environments. Visual stabilization was assessed by comparing eyes-open with eyes-closed conditions while subjects attempted to maintain balance in the presence of a stable visual scene. Visual stabilization in the virtual display w as reduced, as compared wit hreal-world viewing. Th is differencewas partially accountedfor by the reduced field of view in the virtual display. When the retinal flow inthe virtual display wasremoved by using dynamic random-dot stereograms with single-frame lifetimes (cyclopean stimuli), vision did notstabilize posture. There was also an overall larger stabilizing influence of vision when more unstable stances were adopted (e.g., one-foot, as compared with side-by-side, stance). Reducing the graphics latency of the virtual display by 63% did not increase visual stabilization in the virtual display. Other visual and psychological differences between real and virtual environments are discussed.

Visual control of posture in real and virtual environments