Advertisement

Experimental Brain Research

, Volume 141, Issue 2, pp 166–173 | Cite as

Delayed grasping of a Müller-Lyer figure

  • David A. Westwood
  • Tara McEachern
  • Eric A. Roy
Research Article

Abstract.

Grasping movements are more sensitive to the Müller-Lyer (ML) illusion when the response is made after a brief period of visual occlusion. It is unclear whether this effect is due to (1) the elimination of on-line visual feedback, or (2) reliance on a stored perceptual representation of the target for movement planning. Here participants grasped objects from within two forms of a ML figure in four visual conditions (full vision, open-loop, brief delay, and 2-s delay) and estimated object size in the full-vision condition. Peak grasping aperture was influenced by the ML figure in the full-vision condition, although to a much smaller extent than was true for manual size estimation. The effect of the ML figure on peak grasping aperture was substantially increased in the open-loop and delay conditions, which did not differ from one another. These findings highlight the importance of on-line visual feedback for the resistance of grasping to the ML illusion and also call to attention the relevance of task factors such as target previewing, the visuomotor relevance of illusion-inducing elements, and participant strategies.

Prehension Illusion Vision action, Perception Human 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag 2001

Authors and Affiliations

  • David A. Westwood
    • 1
  • Tara McEachern
    • 2
  • Eric A. Roy
    • 2
  1. 1.Department of Psychology, University of Western Ontario, London, Ontario, Canada N6A 5C2
  2. 2.Department of Kinesiology, University of Waterloo, Ontario, Canada

Personalised recommendations