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The Neural Correlates of Crowding-Induced Changes in Appearance

Object recognition in the peripheral visual field is limited by crowding: the disruptive influence of nearby clutter [1, 2]. Despite its severity, little is known about the cortical locus of crowding. Here, we examined the neural correlates of crowding by combining event-related fMRI adaptation with...

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Autores principales: Anderson, Elaine J., Dakin, Steven C., Schwarzkopf, D. Samuel, Rees, Geraint, Greenwood, John A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Cell Press 2012
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3396841/
https://www.ncbi.nlm.nih.gov/pubmed/22658599
http://dx.doi.org/10.1016/j.cub.2012.04.063
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author Anderson, Elaine J.
Dakin, Steven C.
Schwarzkopf, D. Samuel
Rees, Geraint
Greenwood, John A.
author_facet Anderson, Elaine J.
Dakin, Steven C.
Schwarzkopf, D. Samuel
Rees, Geraint
Greenwood, John A.
author_sort Anderson, Elaine J.
collection PubMed
description Object recognition in the peripheral visual field is limited by crowding: the disruptive influence of nearby clutter [1, 2]. Despite its severity, little is known about the cortical locus of crowding. Here, we examined the neural correlates of crowding by combining event-related fMRI adaptation with a change-detection paradigm [3]. Crowding can change the appearance of objects, such that items become perceptually matched to surrounding objects; we used this change in appearance as a signature of crowding and measured brain activity that correlated with the crowded percept. Observers adapted to a peripheral patch of noise surrounded by four Gabor flankers. When crowded, the noise appears oriented and perceptually indistinguishable from the flankers. Consequently, substitution of the noise for a Gabor identical to the flankers (“change-same”) is rarely detected, whereas substitution for an orthogonal Gabor (“change-different”) is rarely missed. We predicted that brain areas representing the crowded percept would show repetition suppression in change-same trials but release from adaptation in change-different trials. This predicted pattern was observed throughout cortical visual areas V1–V4, increasing in strength from early to late visual areas. These results depict crowding as a multistage process, involving even the earliest cortical visual areas, with perceptual consequences that are increasingly influenced by later visual areas.
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spelling pubmed-33968412012-07-24 The Neural Correlates of Crowding-Induced Changes in Appearance Anderson, Elaine J. Dakin, Steven C. Schwarzkopf, D. Samuel Rees, Geraint Greenwood, John A. Curr Biol Report Object recognition in the peripheral visual field is limited by crowding: the disruptive influence of nearby clutter [1, 2]. Despite its severity, little is known about the cortical locus of crowding. Here, we examined the neural correlates of crowding by combining event-related fMRI adaptation with a change-detection paradigm [3]. Crowding can change the appearance of objects, such that items become perceptually matched to surrounding objects; we used this change in appearance as a signature of crowding and measured brain activity that correlated with the crowded percept. Observers adapted to a peripheral patch of noise surrounded by four Gabor flankers. When crowded, the noise appears oriented and perceptually indistinguishable from the flankers. Consequently, substitution of the noise for a Gabor identical to the flankers (“change-same”) is rarely detected, whereas substitution for an orthogonal Gabor (“change-different”) is rarely missed. We predicted that brain areas representing the crowded percept would show repetition suppression in change-same trials but release from adaptation in change-different trials. This predicted pattern was observed throughout cortical visual areas V1–V4, increasing in strength from early to late visual areas. These results depict crowding as a multistage process, involving even the earliest cortical visual areas, with perceptual consequences that are increasingly influenced by later visual areas. Cell Press 2012-07-10 /pmc/articles/PMC3396841/ /pubmed/22658599 http://dx.doi.org/10.1016/j.cub.2012.04.063 Text en © 2012 ELL & Excerpta Medica. https://creativecommons.org/licenses/by/3.0/ Open Access under CC BY 3.0 (https://creativecommons.org/licenses/by/3.0/) license
spellingShingle Report
Anderson, Elaine J.
Dakin, Steven C.
Schwarzkopf, D. Samuel
Rees, Geraint
Greenwood, John A.
The Neural Correlates of Crowding-Induced Changes in Appearance
title The Neural Correlates of Crowding-Induced Changes in Appearance
title_full The Neural Correlates of Crowding-Induced Changes in Appearance
title_fullStr The Neural Correlates of Crowding-Induced Changes in Appearance
title_full_unstemmed The Neural Correlates of Crowding-Induced Changes in Appearance
title_short The Neural Correlates of Crowding-Induced Changes in Appearance
title_sort neural correlates of crowding-induced changes in appearance
topic Report
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3396841/
https://www.ncbi.nlm.nih.gov/pubmed/22658599
http://dx.doi.org/10.1016/j.cub.2012.04.063
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