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Ways of SeeingThe scope and limits of visual cognition$
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Pierre Jacob and Marc Jeannerod

Print publication date: 2003

Print ISBN-13: 9780198509219

Published to Oxford Scholarship Online: April 2010

DOI: 10.1093/acprof:oso/9780198509219.001.0001

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The varieties of normal human visual processing

The varieties of normal human visual processing

(p.105) 4 The varieties of normal human visual processing
Ways of Seeing



Oxford University Press

Numerous psychophysical experiments have revealed in normal human vision a rich and intriguing set of dissociations between different ways of processing one and the same visual stimulus. Of particular interest are dissociations between perceptual and visuomotor responses to a given visual stimulus. The two previous chapters focused, respectively, on anatomical and electrophysiological evidence gathered mostly on the brain of macaque monkeys and on neuropsychological research on brain-lesioned human patients. This chapter focuses on psychological evidence gathered on normal human adults. Primates in general, and humans in particular, are unique among animals in being able to grasp and manipulate objects in their environment using their arms and the dexterity of their hands. Thus, many relevant visuomotor tasks involve visually guided actions constituted by arm and hand movements directed towards objects, such as pointing, reaching and grasping. The chapter highlights the major differences between the visual computations underlying perceptual and visuomotor responses in normal subjects.

Keywords:   visual processing, visuomotor response, perception, perceptual response

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