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Grouping and crowding affect target appearance over different spatial scales.

Bilge Sayim1, Patrick Cavanagh

  • 1Laboratoire Psychologie de la Perception, UniversitĂ© Paris Descartes, Sorbonne Paris CitĂ©, Paris, France. bilge.sayim@ppw.kuleuven.be

Plos One
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Summary
This summary is machine-generated.

Grouping affects target perception over larger distances than crowding. This visual grouping creates a bias, assimilating target identity with surrounding flankers, distinct from crowding

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Area of Science:

  • Visual perception
  • Cognitive psychology
  • Computational neuroscience

Background:

  • Crowding impairs peripheral target identification due to nearby flankers.
  • Recent research suggests similarities between crowding and perceptual grouping.
  • The spatial scales of crowding and grouping effects remain unclear.

Purpose of the Study:

  • To determine if crowding and grouping operate at the same spatial scale.
  • To investigate the relationship between grouping and crowding effects on target perception.

Main Methods:

  • Participants identified a central target letter 'T' flanked by other 'T's.
  • Two sets of flankers were used: one close (causing crowding) and one at varying distances.
  • The second set of flankers either matched (grouped) or mismatched (ungrouped) the target's orientation.

Main Results:

  • Grouped flankers reduced crowding irrespective of their distance, indicating grouping operates over larger spatial scales than crowding.
  • Grouping induced a bias to report the grouped orientation, without affecting perceptual sensitivity.
  • Evidence supports a perceptual grouping explanation (shape assimilation) rather than a response bias.

Conclusions:

  • Grouping and crowding affect target perception at different spatial scales.
  • Perceptual grouping assimilates target identity to surrounding flankers.
  • This shape assimilation effect is spatially distinct from the integration effect in crowding.