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Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
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The configural shape illusion.

Karen B Schloss1, Francesca C Fortenbaugh2, Stephen E Palmer2

  • 1Department of Cognitive, Linguistic, and Psychological Sciences, Brown University, Providence, RI, USA.

Journal of Vision
|July 31, 2014
PubMed
Summary
This summary is machine-generated.

A new configural shape illusion (CSI) distorts an object's apparent shape based on adjacent elements. This visual illusion's strength depends on grouping factors like proximity and similarity.

Keywords:
assimilationperceptual organizationpopulation coding

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Area of Science:

  • Visual perception
  • Psychophysics
  • Cognitive psychology

Background:

  • The configural shape illusion (CSI) is a novel visual phenomenon.
  • It involves the distortion of a target object's perceived shape by an adjacent, grouped inducer shape.
  • This distortion is characterized by selective elongation along the configuration's extended axis.

Purpose of the Study:

  • To introduce and describe the configural shape illusion (CSI).
  • To investigate the factors influencing the magnitude of the CSI.
  • To propose a theoretical explanation for the CSI based on edge assimilation and population coding.

Main Methods:

  • Systematic manipulation of grouping factors (proximity, alignment, similarity, common fate) between target and inducer shapes.
  • Varying relative inducer and target sizes.
  • Presenting participants with visual stimuli and measuring perceived shape distortions.

Main Results:

  • CSI magnitude is modulated by grouping strength, with stronger grouping leading to greater distortion.
  • Factors like proximity, good continuation, alignment, and similarity significantly influence illusion strength.
  • Relative size of the inducer and target also affects the CSI magnitude.

Conclusions:

  • The CSI is explained by edge assimilation, where perceived edges are influenced by surrounding elements.
  • Similarity between target and inducer plays a crucial role in modulating this assimilation.
  • The findings extend existing models of 1D linear extent illusions to explain 2D shape illusions.