Roles of retinal periphery and depth periphery in linear vection and visual control of standing in humans.

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Abstract
Two groups of adult subjects were exposed to central and/or peripheral visual motion affecting either the foreground or the background of the visual field. Body sway and duration of vection over a 1-minute period were measured. The results showed that depth periphery and retinal periphery both play a role in the regulation of posture and in vection. Movement limited to the foregound produced little vection or postural sway compared with motion located in the background. The results also show that motion covering the periphery of the visual field is more efficient in inducing vection and body sway than motion restricted to the centre of the visual field.

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