Illusions and Perceived Images in the Primate Brain

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Science  31 Oct 2003:
Vol. 302, Issue 5646, pp. 789-791
DOI: 10.1126/science.1091065

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A question that has puzzled neuroscientists for more than 100 years is how the brain represents a real stimulus versus its perceived illusion. In his Perspective, Eysel discusses new work in monkeys and humans ( Chen et al., Whitney et al.) showing that illusory representations of tactile and visual stimuli in the primary sensory cortex depend on the type of stimulus and how it is presented.