Perceived depth scales with disparity gradientt

Abstract. Perceived difference in depth between two adjacent stimuli decreases with increasing disparity gradient even if the disparity stays constant, ie when the stimuli approach each o ther along paths within fronto-parallel planes. This depth scaling effect is more pronounced with line stimuli than with two isolated points o r two small symbols and is insignificant for easily discriminable symbols. T h e decrease in perceived depth is more pronounced for horizontal orientat ion than for oblique o r vertical orientation. T h e ratio of perceived depth difference to displayed disparity difference also decreases when the distance between the stimuli increases at a constant gradient in depth. This is to say that we a r e more correct in o u r depth estimates for s teep gradients in depth when the euclidean distance between the stimuli is short.