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Similar Sensitivity to Ladder Contours in Macular Degeneration Patients and Controls

PURPOSE: To determine whether people with central field loss (CFL) from macular degeneration have improved ability to recognize a particularly difficult spatial configuration embedded in noise, the peripherally-viewed ‘ladder contour’. The visibility of these configuration has been linked to general...

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Detalles Bibliográficos
Autores principales: Haun, Andrew M., Peli, Eli
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4501758/
https://www.ncbi.nlm.nih.gov/pubmed/26171784
http://dx.doi.org/10.1371/journal.pone.0128119
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author Haun, Andrew M.
Peli, Eli
author_facet Haun, Andrew M.
Peli, Eli
author_sort Haun, Andrew M.
collection PubMed
description PURPOSE: To determine whether people with central field loss (CFL) from macular degeneration have improved ability to recognize a particularly difficult spatial configuration embedded in noise, the peripherally-viewed ‘ladder contour’. The visibility of these configuration has been linked to general contour integration ability and crowding limitations in peripheral vision. METHODS: We used a trial-based yes-no task. CFL patients and normally-sighted controls performed the task, looking for ladder contours embedded in a field of randomly oriented Gabor patches, at a range of stimulus presentation times (varying stimulus difficulty). Viewing eccentricity in CFL patients was set by their preferred retinal loci (PRLs) and matched artificially in the control group. The contours were presented so as to be tangent to the CFL region, given a patient’s PRL location. RESULTS: CFL and normally-sighted groups performed similarly on the task. The only significant determinant of performance was the viewing eccentricity. CONCLUSIONS: CFL patients do not seem to develop any improved ability to recognize ladder contours with their parafoveal retina, which suggests that there is no underlying improvement in contour integration or reduction in crowding limitations in the region of the PRL despite extended daily use.
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spelling pubmed-45017582015-07-17 Similar Sensitivity to Ladder Contours in Macular Degeneration Patients and Controls Haun, Andrew M. Peli, Eli PLoS One Research Article PURPOSE: To determine whether people with central field loss (CFL) from macular degeneration have improved ability to recognize a particularly difficult spatial configuration embedded in noise, the peripherally-viewed ‘ladder contour’. The visibility of these configuration has been linked to general contour integration ability and crowding limitations in peripheral vision. METHODS: We used a trial-based yes-no task. CFL patients and normally-sighted controls performed the task, looking for ladder contours embedded in a field of randomly oriented Gabor patches, at a range of stimulus presentation times (varying stimulus difficulty). Viewing eccentricity in CFL patients was set by their preferred retinal loci (PRLs) and matched artificially in the control group. The contours were presented so as to be tangent to the CFL region, given a patient’s PRL location. RESULTS: CFL and normally-sighted groups performed similarly on the task. The only significant determinant of performance was the viewing eccentricity. CONCLUSIONS: CFL patients do not seem to develop any improved ability to recognize ladder contours with their parafoveal retina, which suggests that there is no underlying improvement in contour integration or reduction in crowding limitations in the region of the PRL despite extended daily use. Public Library of Science 2015-07-14 /pmc/articles/PMC4501758/ /pubmed/26171784 http://dx.doi.org/10.1371/journal.pone.0128119 Text en © 2015 Haun, Peli http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Haun, Andrew M.
Peli, Eli
Similar Sensitivity to Ladder Contours in Macular Degeneration Patients and Controls
title Similar Sensitivity to Ladder Contours in Macular Degeneration Patients and Controls
title_full Similar Sensitivity to Ladder Contours in Macular Degeneration Patients and Controls
title_fullStr Similar Sensitivity to Ladder Contours in Macular Degeneration Patients and Controls
title_full_unstemmed Similar Sensitivity to Ladder Contours in Macular Degeneration Patients and Controls
title_short Similar Sensitivity to Ladder Contours in Macular Degeneration Patients and Controls
title_sort similar sensitivity to ladder contours in macular degeneration patients and controls
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4501758/
https://www.ncbi.nlm.nih.gov/pubmed/26171784
http://dx.doi.org/10.1371/journal.pone.0128119
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