English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Grasp effects of visual illusions: dynamic or stationary?

Franz, V., & Scharnowski, F. (2003). Grasp effects of visual illusions: dynamic or stationary?. Poster presented at Third Annual Meeting of the Vision Sciences Society (VSS 2003), Sarasota, FL, USA.

Item is

Files

show Files

Locators

show
hide
Description:
-
OA-Status:

Creators

show
hide
 Creators:
Franz, VH, Author           
Scharnowski, F1, 2, Author           
Affiliations:
1Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              
2Former Department Comparative Neurobiology, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497800              

Content

show
hide
Free keywords: -
 Abstract: In recent studies we found effects of visual illusions on the maximum grip aperture in grasping. Here, we ask whether these effects decay (or build up) during the execution of a grasp movement. Some recent studies suggest a decay (Glover Dixon, Perception and Psychophysics, 64, 266–278, 2002), while the view of others is more consistent with a build up (Carey, Trends in Cognitive Sciences, 5, 109–113, 2001). We reanalyzed the data of different studies on the Ebbinghaus / Titchener illusion (Franz et al., Psychological Science, 11, 20–25, 2000; Franz et al., Experimental Brain Research, in press) which used very large sample sizes (26 and 52 participants). The hand aperture of each grasp movement was analysed at different, normalized time points. Special care was taken to avoid possible artefacts which might arise from the hand already touching the target object. Also, we corrected at each time point for the responsiveness of the hand aperture to a physical variation of size. Results show that the illusion effects are remarkably constant over time. This suggests that either the neuronal signals which cause the motor illusion are constant over time, or that the grasp trajectory is largely preprogrammed before the movement starts.

Details

show
hide
Language(s):
 Dates: 2003-10
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1167/3.9.127
BibTex Citekey: 2310
 Degree: -

Event

show
hide
Title: Third Annual Meeting of the Vision Sciences Society (VSS 2003)
Place of Event: Sarasota, FL, USA
Start-/End Date: 2003-05-09 - 2003-05-14

Legal Case

show

Project information

show

Source 1

show
hide
Title: Journal of Vision
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Charlottesville, VA : Scholar One, Inc.
Pages: - Volume / Issue: 3 (9) Sequence Number: - Start / End Page: 127 Identifier: ISSN: 1534-7362
CoNE: https://pure.mpg.de/cone/journals/resource/111061245811050