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Perception, Action, and ConsciousnessSensorimotor Dynamics and Two Visual Systems$
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Nivedita Gangopadhyay, Michael Madary, and Finn Spicer

Print publication date: 2010

Print ISBN-13: 9780199551118

Published to Oxford Scholarship Online: January 2011

DOI: 10.1093/acprof:oso/9780199551118.001.0001

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

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

optic ataxia and the function of the dorsal stream

Chapter:
(p.163) Chapter 10 Why does the perception-action functional dichotomy not match the ventral-dorsal streams anatomical segregation:
Source:
Perception, Action, and Consciousness
Author(s):

Yves Rossetti

Hisaaki Ota

Annabelle Blangero

Alain Vighetto

Laure Pisella

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199551118.003.0010

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

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