DISAMBIGUATING VELOCITY ESTIMATES ACROSS IMAGE SPACE

A translating homogeneous edge viewed through an aperture is an ambigu ous stimulus, while a translating edge discontinuity is unambiguous. U nder what conditions does the visual system use unambiguous velocity e stimates to interpret ambiguous velocity estimates? We considered a tr anslating rectangle visible through a set of stationary apertures. One aperture displayed a rectangle edge while the other apertures display ed corners. Observers reported the direction in which the edge appeare d to translate, The results suggest that collinearity and terminator p roximity determine whether the unambiguous corner velocity was used to interpret the ambiguous edge velocity. These results suggest some of the ways in which the visual system controls the integration of veloci ty estimates across image space.