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  The Effects of Visual Illusions on Grasping

Franz, V., Fahle, M., Bülthoff, H., & Gegenfurtner, K.(1999). The Effects of Visual Illusions on Grasping (74). Tübingen, Germany: Max Planck Institute for Biological Cybernetics.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-E625-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-1970-1
Genre: Report

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 Creators:
Franz, V1, 2, Author              
Fahle, M, Author              
Bülthoff, HH1, 2, Author              
Gegenfurtner, K, 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: In recent years the view has been advocated that the motor system is immune to visual size illusions. This is regarded as a consequence of a fundamental division of labor in the primate brain: vision for action versus vision for perception. We tested this claim for the Mueller-Lyer illusion and the Parallel-Lines illusion. Both illusions clearly affected grasping. The effects on grasping were similar though not perfectly equal to the effects on perception. We present evidence that these small differences are due to problems in matching the perceptual and the motor tasks. We argue that grasping is an inherently unipolar measure because only one object can be grasped with the same hand at a time, while perceptual measures usually are bipolar because they require a comparison of two objects. We show that this difference is a central problem in matching the perceptual and the motor task.

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 Dates: 1999-11
 Publication Status: Published in print
 Pages: 21
 Publishing info: Tübingen, Germany : Max Planck Institute for Biological Cybernetics
 Table of Contents: -
 Rev. Type: -
 Identifiers: Report Nr.: 74
BibTex Citekey: 1346
 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: 74 Sequence Number: - Start / End Page: - Identifier: -