Depth capture by kinetic depth and by stereopsis

The perceived depth of regions within a stereogram lacking explicit dispari ty information can be captured by the surface structure of regions where di sparity is explicit: stereo capture. In two experiments, observers estimate d surface curvature/depth of an untextured object (a 'ribbon') superimposed on a cylinder textured with dots, the cylinder curvature being defined by disparity (stereo depth) or by motion parallax (kinetic depth: KD). With th e stereo-defined cylinder, depth capture was obtained under conditions wher e the disparity of the ribbon was ambiguous; with the KD, cylinder depth ca pture was obtained under conditions where the motion flow of the cylinder w as in a direction parallel to that of the ribbon. These results demonstrate yet another similarity between KD and stereopsis.