Perceived positions determine crowding.

Crowding is a fundamental bottleneck in object recognition. In crowding, an object in the periphery becomes unrecognizable when surrounded by clutter or distractor objects. Crowding depends on the positions of target and distractors, both their eccentricity and their relative spacing. In all previou...

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Autores principales:	Gerrit W Maus, Jason Fischer, David Whitney
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2011
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b9afeee0fae84521bab0248b0a5b5f03
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id	oai:doaj.org-article:b9afeee0fae84521bab0248b0a5b5f03
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spelling	oai:doaj.org-article:b9afeee0fae84521bab0248b0a5b5f032021-11-18T06:53:22ZPerceived positions determine crowding.1932-620310.1371/journal.pone.0019796https://doaj.org/article/b9afeee0fae84521bab0248b0a5b5f032011-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21629690/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203Crowding is a fundamental bottleneck in object recognition. In crowding, an object in the periphery becomes unrecognizable when surrounded by clutter or distractor objects. Crowding depends on the positions of target and distractors, both their eccentricity and their relative spacing. In all previous studies, position has been expressed in terms of retinal position. However, in a number of situations retinal and perceived positions can be dissociated. Does retinal or perceived position determine the magnitude of crowding? Here observers performed an orientation judgment on a target Gabor patch surrounded by distractors that drifted toward or away from the target, causing an illusory motion-induced position shift. Distractors in identical physical positions led to worse performance when they drifted towards the target (appearing closer) versus away from the target (appearing further). This difference in crowding corresponded to the difference in perceived positions. Further, the perceptual mislocalization was necessary for the change in crowding, and both the mislocalization and crowding scaled with drift speed. The results show that crowding occurs after perceived positions have been assigned by the visual system. Crowding does not operate in a purely retinal coordinate system; perceived positions need to be taken into account.Gerrit W MausJason FischerDavid WhitneyPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 6, Iss 5, p e19796 (2011)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Gerrit W Maus Jason Fischer David Whitney Perceived positions determine crowding.
description	Crowding is a fundamental bottleneck in object recognition. In crowding, an object in the periphery becomes unrecognizable when surrounded by clutter or distractor objects. Crowding depends on the positions of target and distractors, both their eccentricity and their relative spacing. In all previous studies, position has been expressed in terms of retinal position. However, in a number of situations retinal and perceived positions can be dissociated. Does retinal or perceived position determine the magnitude of crowding? Here observers performed an orientation judgment on a target Gabor patch surrounded by distractors that drifted toward or away from the target, causing an illusory motion-induced position shift. Distractors in identical physical positions led to worse performance when they drifted towards the target (appearing closer) versus away from the target (appearing further). This difference in crowding corresponded to the difference in perceived positions. Further, the perceptual mislocalization was necessary for the change in crowding, and both the mislocalization and crowding scaled with drift speed. The results show that crowding occurs after perceived positions have been assigned by the visual system. Crowding does not operate in a purely retinal coordinate system; perceived positions need to be taken into account.
format	article
author	Gerrit W Maus Jason Fischer David Whitney
author_facet	Gerrit W Maus Jason Fischer David Whitney
author_sort	Gerrit W Maus
title	Perceived positions determine crowding.
title_short	Perceived positions determine crowding.
title_full	Perceived positions determine crowding.
title_fullStr	Perceived positions determine crowding.
title_full_unstemmed	Perceived positions determine crowding.
title_sort	perceived positions determine crowding.
publisher	Public Library of Science (PLoS)
publishDate	2011
url	https://doaj.org/article/b9afeee0fae84521bab0248b0a5b5f03
work_keys_str_mv	AT gerritwmaus perceivedpositionsdeterminecrowding AT jasonfischer perceivedpositionsdeterminecrowding AT davidwhitney perceivedpositionsdeterminecrowding
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Perceived positions determine crowding.

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