that “depth-maps-with-parameters ” are first computed in a modular fashion for each cue type. The resulting estimates are then promoted: the missing parameters in each depth map are filled in by comparison with others. The process of cue promotion constitutes an interaction among different cues, 2 FIGURE 1. Illustration of the manner in which depth from texture (d,) and depth from motion (d,,,) are varied independently. Round texture elements of random size and spacing are formed by the intersections of a cylinder (with depth d,) with randomly-placed balls. The resulting textured surface is then projected (parallel to z-axis) onto a second cylinder (with depth d,,,). Stimuli are generated by projections (parallel to z-axis) of the second surface rotated about the x-axis. The width of the projected surface is 2 W.