title: Apparent reversals for circular and elliptical stimuli.
abstract: Number of apparent reversals for various patterned ellipses and circles was investigated. Ellipses produced significantly more reversals than circles. Patterned stimuli produced a number of reversals dependent upon pattern orientation and corroborated predictions consistent with Power and Day's (1973) general constancy theory for apparent reversals.
mesh_terms: D005556:Form Perception; D006801:Humans; D007088:Illusions; D009039:Motion Perception; D009903:Optical Illusions; D009949:Orientation; D010364:Pattern Recognition, Visual; D012399:Rotation