Effects of visual illusions on grasping

Volker H. Franz, Heinrich H. Bülthoff, Manfred Fahle, Karl R. Gegenfurtner

Research output: Contribution to journalArticlepeer-review

155 Citations (Scopus)


In 2 experiments, the Müller-Lyer illusion (F. C. Müller-Lyer, 1889; N = 16) and the parallel-lines illusion (W. Wundt, 1898; N = 26) clearly affected maximum preshape aperture in grasping (both ps < .001). The grasping effects were similar but not perfectly equal to the perceptual effects. Control experiments show that these differences can be attributed to problems in matching the perceptual task and the grasping task. A model is described stating the assumptions that are needed to compare the grasping effects and the perceptual effects of visual illusions. Further studies on the relationship between perception and grasping are reviewed. These studies provide no clear evidence for a dissociation between perception and grasping and therefore do not support the action versus perception hypothesis (A. D. Milner & M. A. Goodale, 1995).

Original languageEnglish
Pages (from-to)1124-1144
Number of pages21
JournalJournal of Experimental Psychology: Human Perception and Performance
Issue number5
Publication statusPublished - 2001 Oct
Externally publishedYes

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Arts and Humanities (miscellaneous)
  • Behavioral Neuroscience


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