Recognition judgments of complex-textured relief surfaces were made under varying angles of a projected light source. Photos of these same and similar surfaces, taken under the identical light angles, served as the variable stimuli against which the recognition judgments were made. The extent to which shadow enhanced recognition was a function of the availability of other cues for recognition in the stimulus material. Addition of shadow could serve to degrade recognition as well, when pictorial information from which judgments were made contained minimal shadow.
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