Chapter

Completion Through a Permanent Scotoma: Fast Interpolation Across the Blind Spot and the Processing of Occlusion

Mario Forani JR., Leticia De Oliveira, Eliane Volchan, Luiz Pessoa, Ricardo Gattass and Carlos Eduardo Rocha-Miranda

in Filling-In

Published in print April 2003 | ISBN: 9780195140132
Published online May 2009 | e-ISBN: 9780199865307 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780195140132.003.0009
 Completion Through a Permanent Scotoma: Fast Interpolation Across the Blind Spot and the Processing of Occlusion

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The existence of perceptual completion is well documented by a wealth of psychophysical studies, perhaps only rivaled by the many different interpretations of the underlying mechanisms. This chapter argues that some forms of completion are likely implemented early in the visual system. It reviews experimental data showing completion-like properties across the blind spot representation in the striate cortex of monkeys. This property seems to be based on interpolation of spatially collinear stimuli. Experimental evidence is presented for interpolation not restricted to natural scotomata like the blind spot. Additionally, the chapter presents findings of spatial interpolation from striate cortex cells of the opossum, a more primitive mammal.

Keywords: perceptual completion; visual system; striate cortex; monkeys; spatial interpolation; opossum

Chapter.  3962 words.  Illustrated.

Subjects: Neuroscience

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