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  Grasping visual illusions: No difference between perception and action?

Franz, V., Fahle, M., Gegenfurtner, K., & Bülthoff, H. (1999). Grasping visual illusions: No difference between perception and action?. Poster presented at Annual Meeting of the Association for Research in Vision and Ophthalmology (ARVO 1999), Fort Lauderdale, FL, USA.

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Franz, VH1, 2, Author              
Fahle, M, Author              
Gegenfurtner, KR1, 2, Author              
Bülthoff, HH1, 2, 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: PURPOSE: Visually guided motor behavior is assumed to be rather unreceptive to size illusions, indicating two different cortical processing streams for the purposes of perception and action (e.g., Aglioti, DeSouza Goodale, 1995; Current Biology 5, 679-685). Having shown - in contrary - that grasping and perception are equally influenced by the Ebbinghaus / Titchener Illusion (ECVP 98), we tested whether this is also true for the Mueller-Lyer Illusion. METHODS: Plastic bars (40, 43, 46 and 49 mm long, 5 mm wide) were positioned on top of a horizontally oriented monitor. Fins were presented on the monitor being directed either outwards or inwards, such that the fins and the bars resulted in the Mueller-Lyer Illusion. In the grasping task, twelve subjects grasped the bars and the maximal aperture between thumb and index finger was measured using an Optotrak (TM) system. In the visual perception task, the subjects adjusted the length of a comparison bar on the screen to match the length of the plastic bars. RESULTS: There were strong effects of the Mueller-Lyer Illusion on grasping as well as on visual perception. The effect on grasping (3.5+-0.5 mm) was even larger than on perception (2.1+-0.3 mm). CONCLUSIONS: Our results show that grasping is influenced by visual illusions, indicating that the motor system is receptive to visual illusions.

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 Dates: 1999-03
 Publication Status: Published in print
 Pages: -
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 Rev. Type: -
 Identifiers: BibTex Citekey: 1344
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Title: Annual Meeting of the Association for Research in Vision and Ophthalmology (ARVO 1999)
Place of Event: Fort Lauderdale, FL, USA
Start-/End Date: 1999-05-09 - 1999-05-14

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Title: Investigative Ophthalmology and Visual Science
Source Genre: Journal
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Publ. Info: Hagerstown, MD, etc. : Association for Research in Vision and Ophthalmology, etc.
Pages: - Volume / Issue: 40 (4) Sequence Number: - Start / End Page: S413 Identifier: ISSN: 0146-0404
CoNE: https://pure.mpg.de/cone/journals/resource/110978984074949