AbstractReferences1. Gibson J J , 1941 “A critical review of the concept of set in contemporary experimental psychology” Psychological Bulletin 38 781–8172. Gibson J J , 1959 “Perception as a function of stimulation” in Psychology: A Study of a Science Volume I Ed. Koch S (New York: McGraw-Hill)3. Gibson J J , 1968 The Senses Considered as Perceptual Systems (London: George Allen and Unwin)