ABSTRACT
Perceptual strategies are extremely important in the stabilization of our internal representation of external reality. The sensory information is processed by means of such strategies in order to ascertain the identity, size, and location of objects in the environment. The first detailed treatment of the theory that pictorial depth cues and constancy scaling mechanisms might be responsible for some visual illusions proposed that the standard form of the Mueller-Lyer illusion contains perspective cues that lead to the components being interpreted as representatives of objects in depth. Perspective cues that lead to differences in apparent depth have also been suggested as a possible cause for the Poggendorff illusion. An interesting alternative way to look at the effect of experience on depth cue processing and illusions is to consider the percepts of adults who have been blind since birth and who have newly gained their vision.
