Abstract and Keywords
One of the central, fundamental, and general facts about perception—and one that crucially underpins our effective engagement with the world—is that (some aspects of) our perceptual responses remain stable even through dramatic changes in perceptual circumstances that result in dramatic changes in transduced perceptual signals. This chapter presents an overview of what is and is not known about this sort of perceptual constancy. It discusses disputes about the description of the phenomenon, the psychophysical methods for its assessment, and the relation between perceptual constancy and perceptual contrast.The chapter uses constancy in colour vision (i.e., colour constancy) as a central example, and surveys a number of proposals within the research tradition of computational colour constancy for understanding the computational strategies by which perception extracts stabilities, the mechanisms underlying their implementation, and the ways these distinct strategies and mechanisms are combined with one another in real-time perception. Finally, it considers whether perceptual constancy should be construed as perceptual or cognitive in character.
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