Chapter

Why does the perception-action functional dichotomy not match the ventral-dorsal streams anatomical segregation:

Yves Rossetti, Hisaaki Ota, Annabelle Blangero, Alain Vighetto and Laure Pisella

in Perception, Action, and Consciousness

Published in print August 2010 | ISBN: 9780199551118
Published online January 2011 | e-ISBN: 9780191594960 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780199551118.003.0010
Why does the perception-action functional dichotomy not match the ventral-dorsal streams anatomical segregation:

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A main issue in the debate centring on the relation between perception and action is the following: how much of our actions can be performed independently from perception? An answer to this question seems to be provided in the field of motor neuroscience. Accordingly, the main paradigms in the field have tried to investigate residual visuo-motor abilities in patients with visual deficits (e.g., visually guided reach-to-grasp in cortical blindness (blindsight) or visual form agnosia, or to delineate specific visual deficits that would be specific to the action system and not affect perceptual responses (e.g., optic ataxia)). This chapter examines the conclusions which can be drawn from the investigation of optic ataxia through a review of the recent developments made in relation to this neurological condition. It argues that a general oversimplification of the dual-visual systems hypothesis (Milner and Goodale 1995) has led to the popular interpretation that ‘dorsal = action’. It challenges the claims of a neat double dissociation between the conditions observed in optic ataxia and visual agnosia, and in turn between perception and action.

Keywords: perception; action; optic ataxia; dual-visual systems hypothesis; visual agnosia

Chapter.  11004 words.  Illustrated.

Subjects: Cognitive Psychology

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