Volume 7, Number 2, Article 4, Pages 1-12 doi:10.1167/7.2.4 http://journalofvision.org/7/2/4/ ISSN 1534-7362
Configuration influence on crowding
Tomer Livne
Department of Neurobiology, The Weizmann Institute of Science, Rehovot, Israel
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Dov Sagi
Department of Neurobiology, The Weizmann Institute of Science, Rehovot, Israel
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Abstract

The influence of configuration on visual crowding was tested. Eight Gabor patches surrounding a central one were arranged in a way that created several global configurations differing by their internal arrangements (smooth contour vs. random), while still preserving pairwise relationships between the target and flankers. Orientation discrimination and contrast detection of the central Gabor were measured. These measurements revealed differences in the magnitude of crowding produced by the different configurations, especially on the discrimination task. The crowding effect was stronger when random configurations were used and was reduced considerably when a smooth one was used. These results showed the typical dependence of crowding on eccentricity and target–flanker separation, which was independent of the configural effect. Controlling flankers' local orientation allowed addressing the nature of the effect. It was found to be sensitive to spatial relations and did not represent a simple averaging of local orientation estimates. Our results show that crowding operates at a level where configuration information has already been extracted. We relate all this to the object-based nature of perception.

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History
Received May 18, 2006; published February 5, 2007
Citation
Livne, T., & Sagi, D. (2007). Configuration influence on crowding. Journal of Vision, 7(2):4, 1-12, http://journalofvision.org/7/2/4/, doi:10.1167/7.2.4.
Keywords
crowding, configuration, visual periphery, orientation discrimination, contrast detection
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