Four major types of interaction of stimulus dimensions based on perceptual research are described: integral, configural, separable, and asymmetric separable. Implications of these interactions for concept and choice processes are discussed. (Author/DEP)

This article investigates categorical perception as a phenomenon which can be understood in terms of adaptation level theory. Data from four experiments, two visual and two tactual-kinesthetic, supports the idea that categorical perception is a pervasive characteristic of perceptual organization. (JAZ)