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Related Experiment Video

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Conditions Affecting Social Space in Drosophila melanogaster
08:04

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Published on: November 5, 2015

Crowding changes appearance.

John A Greenwood1, Peter J Bex, Steven C Dakin

  • 1UCL Institute of Ophthalmology, University College London, 11-43 Bath Street, London EC1V9EL, UK. john.greenwood@ucl.ac.uk

Current Biology : CB
|March 9, 2010
PubMed
Summary
This summary is machine-generated.

Crowding in peripheral vision doesn't just disrupt object recognition; it systematically alters object appearance. This study shows surrounding elements can induce illusory orientations in targets, simplifying visual processing.

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Area of Science:

  • Visual perception
  • Cognitive neuroscience
  • Psychophysics

Background:

  • Crowding is a known limitation in peripheral vision, hindering object recognition in cluttered scenes.
  • It's often viewed as a disruptive process where object representations are lost.
  • This study investigates whether crowding actively changes object appearance.

Purpose of the Study:

  • To demonstrate that crowding systematically alters object appearance, rather than merely suppressing representations.
  • To investigate the role of flanker orientation in inducing illusory percepts in crowded targets.
  • To explore the underlying mechanisms of crowding, testing predictions from change-based models.

Main Methods:

  • Utilized a change-detection paradigm with visual noise targets and oriented Gabor flankers.
  • Manipulated flanker orientation and target properties (noise, blank).
  • Investigated illusory target orientation and tilt aftereffects.

Main Results:

  • Crowded visual noise targets perceptually adopted the orientation of surrounding Gabor flankers.
  • Illusory target rotations were induced even with blank targets, showing crowding creates apparent structure.
  • Adaptation to crowded stimuli resulted in tilt aftereffects, suggesting spatial spread of flanker signals.

Conclusions:

  • Crowding actively changes object appearance by inducing illusory orientations.
  • It acts as a regularization process, simplifying peripheral vision by promoting consistent appearance among adjacent objects.
  • Findings support change-based models of crowding, such as perceptual averaging.