English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Are motor effects of visual illusions caused by different mechanisms than the perceptual illusions?

Franz, V., Bülthoff, H., & Fahle, M. (2002). Are motor effects of visual illusions caused by different mechanisms than the perceptual illusions? Perception, 31(ECVP Abstract Supplement), 144.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-DF72-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-19CB-B
Genre: Meeting Abstract

Files

show Files

Locators

show
hide
Description:
-

Creators

show
hide
 Creators:
Franz, VH1, 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              

Content

show
hide
Free keywords: -
 Abstract: In previous studies, we found effects of the Ebbinghaus (or Titchener) illusion on grasping. This contradicts the notion that the motor system uses visual transformations which are (a) different from the perceptual transformations and (b) unaffected by visual illusions [Milner and Goodale, 1995 The Visual Brain in Action (Oxford: Oxford University Press)]. Here, we tested whether the grasp effects are generated independently from the perceptual illusions. This could be the case if the motor system treated the illusion-inducing context elements as obstacles and tried to avoid them. To test this hypothesis, we varied the distance between context elements and target. Aluminum discs (31, 34, or 37 mm in diameter) were surrounded by small or large context circles (10 or 58 mm in diameter) at one of two distances (24 or 31 mm midpoint target disc to nearest point on context circles). In the perceptual task, fifty-two participants adjusted the size of a comparison stimulus to match the size of the target disc. In the grasping task, participants grasped the target disc. The trajectories were recorded and the maximum grasp apertures determined. The motor illusion responded to the variation of distance between context elements and target disc in exactly the same way as the perceptual illusion. This suggests that the same neuronal signals are responsible for the perceptual and for the motor illusion.

Details

show
hide
Language(s):
 Dates: 2002-08
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: BibTex Citekey: 1612
DOI: 10.1177/03010066020310S101
 Degree: -

Event

show
hide
Title: 25th European Conference on Visual Perception (ECVP 2002)
Place of Event: Glasgow, UK
Start-/End Date: 2002-08-25 - 2002-08-29

Legal Case

show

Project information

show

Source 1

show
hide
Title: Perception
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: London : Pion Ltd.
Pages: - Volume / Issue: 31 (ECVP Abstract Supplement) Sequence Number: - Start / End Page: 144 Identifier: ISSN: 0301-0066
CoNE: https://pure.mpg.de/cone/journals/resource/954925509369