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The crowding factor method applied to parafoveal vision

Crowding increases with eccentricity and is most readily observed in the periphery. During natural, active vision, however, central vision plays an important role. Measures of critical distance to estimate crowding are difficult in central vision, as these distances are small. Any overlap of flanker...

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Autores principales: Ghahghaei, Saeideh, Walker, Laura
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Association for Research in Vision and Ophthalmology 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5054730/
https://www.ncbi.nlm.nih.gov/pubmed/27690170
http://dx.doi.org/10.1167/16.11.30
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author Ghahghaei, Saeideh
Walker, Laura
author_facet Ghahghaei, Saeideh
Walker, Laura
author_sort Ghahghaei, Saeideh
collection PubMed
description Crowding increases with eccentricity and is most readily observed in the periphery. During natural, active vision, however, central vision plays an important role. Measures of critical distance to estimate crowding are difficult in central vision, as these distances are small. Any overlap of flankers with the target may create an overlay masking confound. The crowding factor method avoids this issue by simultaneously modulating target size and flanker distance and using a ratio to compare crowded to uncrowded conditions. This method was developed and applied in the periphery (Petrov & Meleshkevich, 2011b). In this work, we apply the method to characterize crowding in parafoveal vision (<3.5 visual degrees) with spatial uncertainty. We find that eccentricity and hemifield have less impact on crowding than in the periphery, yet radial/tangential asymmetries are clearly preserved. There are considerable idiosyncratic differences observed between participants. The crowding factor method provides a powerful tool for examining crowding in central and peripheral vision, which will be useful in future studies that seek to understand visual processing under natural, active viewing conditions.
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spelling pubmed-50547302016-10-11 The crowding factor method applied to parafoveal vision Ghahghaei, Saeideh Walker, Laura J Vis Article Crowding increases with eccentricity and is most readily observed in the periphery. During natural, active vision, however, central vision plays an important role. Measures of critical distance to estimate crowding are difficult in central vision, as these distances are small. Any overlap of flankers with the target may create an overlay masking confound. The crowding factor method avoids this issue by simultaneously modulating target size and flanker distance and using a ratio to compare crowded to uncrowded conditions. This method was developed and applied in the periphery (Petrov & Meleshkevich, 2011b). In this work, we apply the method to characterize crowding in parafoveal vision (<3.5 visual degrees) with spatial uncertainty. We find that eccentricity and hemifield have less impact on crowding than in the periphery, yet radial/tangential asymmetries are clearly preserved. There are considerable idiosyncratic differences observed between participants. The crowding factor method provides a powerful tool for examining crowding in central and peripheral vision, which will be useful in future studies that seek to understand visual processing under natural, active viewing conditions. The Association for Research in Vision and Ophthalmology 2016-09-30 /pmc/articles/PMC5054730/ /pubmed/27690170 http://dx.doi.org/10.1167/16.11.30 Text en http://creativecommons.org/licenses/by-nc-nd/4.0/ This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
spellingShingle Article
Ghahghaei, Saeideh
Walker, Laura
The crowding factor method applied to parafoveal vision
title The crowding factor method applied to parafoveal vision
title_full The crowding factor method applied to parafoveal vision
title_fullStr The crowding factor method applied to parafoveal vision
title_full_unstemmed The crowding factor method applied to parafoveal vision
title_short The crowding factor method applied to parafoveal vision
title_sort crowding factor method applied to parafoveal vision
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5054730/
https://www.ncbi.nlm.nih.gov/pubmed/27690170
http://dx.doi.org/10.1167/16.11.30
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