Form constraints in motion binding

Visual analyses of form and motion proceed along parallel streams. Unified perception of moving forms requires interactions between these streams, alt hough whether the interactions occur early or late in cortical processing r emains unresolved. Using rotating outlined shapes sampled through apertures , we showed that binding local motions into global object motion depends st rongly on spatial configuration. Identical local motion components are perc eived coherently when they define closed configurations, but usually not wh en they define open configurations. Our experiments show this influence ari ses in early cortical levels and operates as a form-based veto of motion in tegration in the absence of closure.