| Crowding in peripheral vision: why bigger is better. | |
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MedLine Citation:
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PMID: 19853450 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We enjoy the illusion that visual resolution is high across the entire field of vision. However, this illusion can be easily dispelled by trying to identify objects in a cluttered environment out of the corner of your eye. This reflects, in part, the well-known decline in visual resolution in peripheral vision; however, the main bottleneck for reading or object recognition in peripheral vision is crowding. Objects that can be easily identified in isolation seem indistinct and jumbled in clutter. Crowding is thought to reflect inappropriate integration of the target and flankers in peripheral vision [1, 2]. Here, we uncover and explain a paradox in peripheral crowding: under certain conditions, increasing the size or number of flanking rings results in a paradoxical decrease in the magnitude of crowding-i.e., the bigger or more numerous the flanks, the smaller the crowding. These surprising results are predicted by a model in which crowding is determined by the centroids of approximately 4-8 independent features within approximately 0.5x the target eccentricity. These features are then integrated into a texture beyond the stage of feature analysis. We speculate that this process may contribute to the illusion of high resolution across the field of vision. |
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Authors:
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Dennis M Levi; Thom Carney |
Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural Date: 2009-10-22 |
Journal Detail:
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Title: Current biology : CB Volume: 19 ISSN: 1879-0445 ISO Abbreviation: Curr. Biol. Publication Date: 2009 Dec |
Date Detail:
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Created Date: 2010-01-12 Completed Date: 2010-03-30 Revised Date: 2011-07-25 |
Medline Journal Info:
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Nlm Unique ID: 9107782 Medline TA: Curr Biol Country: England |
Other Details:
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Languages: eng Pagination: 1988-93 Citation Subset: IM |
Affiliation:
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School of Optometry and Helen Wills Neuroscience Institute, University of California, Berkeley, Berkeley, CA 94720-2020, USA. dlevi@berkeley.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Discrimination (Psychology)* Field Dependence-Independence Humans Pattern Recognition, Visual* Perceptual Masking Psychophysics Visual Perception / physiology* |
| Grant Support | |
ID/Acronym/Agency:
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R01 EY001728-33/EY/NEI NIH HHS; R01EY01728/EY/NEI NIH HHS; R01EY04776/EY/NEI NIH HHS |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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