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  Grasping visual illusions: No evidence for a dissociation between perception and action

Franz, V., Gegenfurtner, K., Bülthoff, H., & Fahle, M.(1999). Grasping visual illusions: No evidence for a dissociation between perception and action (67). Tübingen, Germany: Max Planck Institute for Biological Cybernetics.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-E6E9-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-1969-A
Genre: Report

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 Creators:
Franz, V1, 2, Author              
Gegenfurtner, K1, 2, Author              
Bülthoff, HH1, 2, Author              
Fahle, M, Author              
Affiliations:
1Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              
2Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497797              

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 Abstract: Neuropsychological studies motivated the theory that the primate visual system might be organized into two parallel pathways, one for conscious perception and one to guide action (Milner Goodale, 1995). Supporting evidence in healthy humans seemed to come from a dissociation in visual illusions: Aglioti, DeSouza, and Goodale (1995) reported that the Ebbinghaus (or Titchener) Illusion deceived perceptual judgments of size, but only marginally influenced the size estimates used in grasping. Here we show that identical effects of the illusion are found if the perceptual and grasping tasks are appropriately matched. We show that the differences found by Aglioti et al. (1995) can be accounted for by a hitherto unknown, super additive effect in the illusion. We conclude that the illusion does not provide evidence for the existence of two distinct pathways for perception and action in the visual system.

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 Dates: 1999-02
 Publication Status: Published in print
 Pages: -
 Publishing info: Tübingen, Germany : Max Planck Institute for Biological Cybernetics
 Table of Contents: -
 Rev. Type: -
 Identifiers: Report Nr.: 67
BibTex Citekey: 1535
 Degree: -

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Title: Technical Report of the Max Planck Institute for Biological Cybernetics
Source Genre: Series
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Pages: - Volume / Issue: 67 Sequence Number: - Start / End Page: - Identifier: -