Fig. 8.

Enhancement of the Cornsweet illusion by a variety of concordant stimulus information that greatly increases the probability that the source of the stimulus is two differently reflective surfaces illuminated by different amounts of light (see Fig.4B). (The areas surrounding the two surfaces, i.e., the sky and ground, have the same average luminance.) By combining various mutually reinforcing information in a complex scene that better simulates normal viewing conditions, the Cornsweet effect elicited by the object in the foreground can be much enhanced (see Table 1).