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Spatial Alignment and Response Hand in Geometric and Motion Illusions.

Lisa Scocchia1, Michela Paroli2, Natale A Stucchi1

  • 1Department of Psychology, University of Milano-BicoccaMilan, Italy.

Frontiers in Psychology
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PubMed
Summary

Action parameters like hand dominance minimally impact visual illusion perception. While the non-dominant hand showed some effects on motion illusions, geometric illusions remained largely unaffected, suggesting relative independence between action and perception.

Keywords:
Poggendorff illusionVanishing Point illusionattentional dominancehand actionshand dominancespatial alignment effect

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Visual Perception

Background:

  • Visual illusions can influence visually guided actions, particularly movement planning.
  • Object affordances can enhance perceptual judgments, but the reverse influence—action parameters on illusion perception—is largely unknown.

Purpose of the Study:

  • To investigate if response mode, specifically hand dominance and stimulus alignment, affects perception of geometric (Poggendorff) and motion (Vanishing Point) illusions.
  • To explore the interaction between action-related features and visual illusion perception.

Main Methods:

  • Seventeen right-handed participants responded to Poggendorff and Vanishing Point illusions using dominant (right) and non-dominant (left) hands.
  • Stimuli were presented in regular and mirror-reversed orientations to assess spatial alignment effects.

Main Results:

  • The Poggendorff illusion was stronger with the regular display compared to the mirror version.
  • Left-hand responses to the Vanishing Point illusion resulted in lower accuracy and higher variability.
  • Hand precision had a marginal effect on motion illusions but not geometric illusions, where attentional factors seemed more influential.

Conclusions:

  • Response mode, including manual action parameters, generally does not significantly alter visual illusion perception.
  • Findings suggest a relative independence between action and perception systems, except when using the less-skilled non-dominant hand, which may involve more deliberate responses.