LOCALIZING CONTOURS DEFINED BY MORE THAN ONE ATTRIBUTE

Two experiments were Fun in order to test how information from differe nt attributes is combined to localize contours. In Expt 1 the apparent position of a contour defined by one attribute was measured while a c ontour defined by another attribute was presented beside it. Interacti ons were found between all pairings of luminance, color, motion and te xture. These results suggested that the information associated with ea ch contour is integrated at a common site. In Expt 2 the precision of localization was measured for contours defined by one, two or three at tributes (combinations of luminance, color and texture). The improveme nt in precision with additional attributes again supported an integrat ion of contour information at a common site prior to a decision of loc alization.