Apparent reversals as a function of perceiver group, distance, and geometric shape.
3 groups of 3 men (high, medium, low perceivers) reported more reversals for trapezoids than rectangles. Responses were sensitive to distance, shadowing, and target, as Cahill suggested.
D003463:Cues; D003867:Depth Perception; D004292:Dominance, Cerebral; D005556:Form Perception; D006801:Humans; D007088:Illusions; D008297:Male; D009039:Motion Perception; D009903:Optical Illusions