The autistic effect of reward and punishment on directional perception

Wapner and Werner's 'Perceptual Development' in 1957 brought to us vividly the motor effect upon perception. One of their- six postulates asserts that diverse stimuli have functional equivalence, that is to say, stimuli ideally may lead to identical 'Perceptual end-products. And their experiment 'Effect of Directional Dynamics in Pictured Objects on the Position of the Apparent Median Plane' made me wonder whether the directional dynamics which comes out of autistic effect rather than objective structure can also do the same thing to the position of the apparent median plane. Take the figure used in Schafer's experiment (4) for example, it is an ambiguous figure in its objective structure. But one of the two profiles became figure, and the other became ground after the autistic effect had been built by punishment and reward.