Abstract
Abstract Most visual illusions involve distorted or altered perception of objects or events or misinterpretation of image information. The discrepancy between what we experience and what is physically present in the world or in the retinal image can be large, surprising, and dramatic. It is much rarer to see things that simply are not there at all. Repetitive stimuli, such as grating patterns or flickering lights, can induce perception of a range of illusory geometric patterns, forms, and movements—during or after exposure to the inducing stimulus. This chapter describes one such illusory phenomenon—the graph-paper effect—a striking illusion of moving, oriented lines and edges; links it to a family of related effects; and offers a general theory for these effects in terms of neural inhibition and disinhibition at the level of the visual cortex.
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