Bisection from Different Heights of Observation in an Optical Flow
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In the last years we have developed a large scale device corresponding to a Textured Flow Generator (TFG) which allows simulation, for a stationary subject, of the optical flow perceived normally on the ground while walking. The TFG was used to study the influence of the visual environment motion on spatial localization and to test how such a task is achieved from different heights of observation relative to the ground. These studies showed that a movement of the optical environment induces an error in localization which is proportional to retinal speed and in the same direction as the motion of the visual texture.