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Grouping, pooling, and when bigger is better in visual crowding.

Mauro Manassi1, Bilge Sayim, Michael H Herzog

  • 1Laboratory of Psychophysics, Brain Mind Institute, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland. mauro.manassi@epfl.ch

Journal of Vision
|September 29, 2012
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Summary

Grouping and Gestalt principles influence visual crowding in both foveal and peripheral vision. These configural effects, rather than simple pooling or centroid models, explain how flankers affect target perception, demonstrating "bigger is better" under specific grouping conditions.

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Area of Science:

  • Visual perception
  • Cognitive psychology
  • Neuroscience

Background:

  • Visual crowding impairs target perception due to nearby elements.
  • Existing models like pooling and centroid hypothesis offer conflicting explanations.
  • Previous research highlighted grouping and Gestalt effects in foveal crowding.

Purpose of the Study:

  • To investigate if grouping and Gestalt effects in foveal crowding extend to peripheral vision.
  • To test the explanatory power of pooling and centroid models in peripheral crowding.
  • To elucidate the role of configural processing in both central and peripheral visual crowding.

Main Methods:

  • Experimental manipulation of target-flanker grouping and Gestalt properties.
  • Assessment of crowding effects in both foveal and peripheral visual fields.
  • Comparison of empirical results with predictions from pooling and centroid models.

Main Results:

  • Grouping and Gestalt principles significantly modulate crowding in peripheral vision, mirroring foveal effects.
  • The observed effects cannot be adequately explained by standard pooling or centroid models.
  • Configural factors, not just element density, are critical determinants of peripheral crowding.

Conclusions:

  • Visual crowding is shaped by grouping and Gestalt principles across both foveal and peripheral vision.
  • Neither simple pooling nor centroid models fully account for the observed configural influences on crowding.
  • The findings advance our understanding of visual attention and object recognition in complex scenes.