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Related Experiment Videos

Does a monocularly presented size-contrast illusion influence grip aperture?

J J Marotta1, J F DeSouza, A M Haffenden

  • 1Vision and Motor Control Laboratory, The University of Western Ontario, London, Canada.

Neuropsychologia
|August 15, 1998
PubMed
Summary

When binocular vision is unavailable, the human visuomotor system relies on monocular cues, increasing susceptibility to visual illusions like the Ebbinghaus Circles Illusion during object grasping.

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Area of Science:

  • Visual perception
  • Motor control
  • Human psychophysics

Background:

  • Binocular cues are crucial for accurate size perception and visuomotor control.
  • Pictorial illusions can distort size perception, potentially affecting actions.
  • The role of monocular cues in visuomotor tasks under altered viewing conditions requires further investigation.

Purpose of the Study:

  • To investigate the influence of pictorial illusions on perceptual judgments and grasping actions under monocular viewing conditions.
  • To determine if scene-based pictorial cues become more dominant when binocular cues are absent.
  • To assess the susceptibility of the visuomotor system to illusions when relying on monocular information.

Main Methods:

  • Participants performed perceptual judgments and grasping tasks involving target discs.

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  • Stimuli were presented under both binocular and monocular viewing conditions.
  • The Ebbinghaus (Titchener) Circles Illusion was employed to manipulate perceived size.

    • Main Results:

    • Under binocular viewing, participants accurately scaled grips to true size and were unaffected by the illusion.
    • Under monocular viewing, participants' grasping actions were influenced by the Ebbinghaus illusion.
    • Physically different discs appearing equivalent due to illusory effects were treated as such during grasping.

    Conclusions:

    • Binocular information is critical for accurate human prehension (grasping).
    • When binocular information is unavailable, the visuomotor system relies on monocular cues.
    • This reliance on monocular cues increases susceptibility to pictorial illusions, impacting visuomotor control.