Visual and proprioceptive shifts in perceived egocentric direction inducedby eye-position

The relation of three main effects of eye-position on perceived direction w as investigated using a method of hand pointing in the horizontal plane: (1 ) Retinal eccentricity is overestimated with respect to the fovea by a cons tant factor of 2.6 degrees; (2) an extraretinal signal induces a shift in p erceived 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 reward the direction of eccentric eye-position (slope 0.23) whi le perceived trunk position remains unchanged. (C) 2000 Elsevier Science Lt d. All rights reserved.