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Visual and proprioceptive shifts in perceived egocentric direction induced by eye-position
1Institut für Arbeitsphysiologie, Universität Dortmund, Germany. joerg.lewald@ruhr-uni-bochum.de
Abstract:
The relation of three main effects of eye-position on perceived direction was investigated using a method of hand pointing in the horizontal plane: (1) Retinal eccentricity is overestimated with respect to the fovea by a constant factor of 2.6 degrees; (2) an extraretinal signal induces a shift in perceived visual direction (slope 0.12) that is opposite to the direction of eccentric gaze; and (3) the perceived position of the median plane of the head shifts toward the direction of eccentric eye-position (slope 0.23) while perceived trunk position remains unchanged.
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