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Applying Incongruent Visual-Tactile Stimuli during Object Transfer with Vibro-Tactile Feedback
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Published on: May 23, 2019

Illusions can warp visual space.

Jeroen B J Smeets1, Rita Sousa, Eli Brenner

  • 1Research Institute MOVE, Faculty of Human Movement Sciences, VU University Amsterdam, van der Boechorststraat 9, NL 1081 BT Amsterdam, The Netherlands. J.Smeets@fbw.vu.nl

Perception
|December 3, 2009
PubMed
Summary
This summary is machine-generated.

Visual illusions, unlike everyday perception, distort specific visual attributes rather than the entire perceived space. This suggests visual illusions do not deform visual space but alter individual visual attributes.

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Area of Science:

  • Visual perception
  • Cognitive psychology
  • Geometric illusions

Background:

  • Human perception of visual space is not always accurate.
  • Previous research suggested systematic errors in visual perception align with projective and affine geometry.
  • The perceived center of points was thought to be independent of construction order, supporting a consistent 'perceptual space'.

Purpose of the Study:

  • To investigate if the perceived center of points in 2-D visual illusions is independent of construction order.
  • To compare the nature of misperceptions in visual illusions with everyday perceptual errors.
  • To propose an alternative framework for understanding visual illusions.

Main Methods:

  • Experiments were conducted using well-known 2-D visual illusions, specifically the Judd and Poggendorff illusions.
  • The study analyzed the perceived center of point sets within these illusory displays.
  • The order of constructing the perceived center was varied to test for dependency.

Main Results:

  • In both the Judd and Poggendorff illusions, the perceived center of points was found to be dependent on the construction method.
  • This dependency indicates that misperceptions in these illusions differ fundamentally from everyday perceptual errors.
  • The findings challenge the notion of a unified, geometrically consistent 'perceived visual space'.

Conclusions:

  • The concept of a single, deformable 'perceived visual space' is not a useful model for explaining behavior in visual illusions.
  • Visual illusions likely affect specific visual attributes (e.g., length, orientation) rather than distorting the overall spatial representation.
  • An alternative model is proposed where illusions selectively alter individual visual attributes, leaving others intact.