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Temporal modulation improves dynamic peripheral acuity

Macular degeneration and related visual disorders greatly limit foveal function, resulting in reliance on the peripheral retina for tasks requiring fine spatial vision. Here we investigate stimulus manipulations intended to maximize peripheral acuity for dynamic targets. Acuity was measured using a...

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Detalles Bibliográficos
Autores principales: Patrick, Jonathan A., Roach, Neil W., McGraw, Paul V.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Association for Research in Vision and Ophthalmology 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6871547/
https://www.ncbi.nlm.nih.gov/pubmed/31747690
http://dx.doi.org/10.1167/19.13.12
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author Patrick, Jonathan A.
Roach, Neil W.
McGraw, Paul V.
author_facet Patrick, Jonathan A.
Roach, Neil W.
McGraw, Paul V.
author_sort Patrick, Jonathan A.
collection PubMed
description Macular degeneration and related visual disorders greatly limit foveal function, resulting in reliance on the peripheral retina for tasks requiring fine spatial vision. Here we investigate stimulus manipulations intended to maximize peripheral acuity for dynamic targets. Acuity was measured using a single interval orientation discrimination task at 10° eccentricity. Two types of image motion were investigated along with two different forms of temporal manipulation. Smooth object motion was generated by translating targets along an isoeccentric path at a constant speed (0–20°/s). Ocular motion was simulated by jittering target location using previously recorded fixational eye movement data, amplified by a variable gain factor (0–8). In one stimulus manipulation, the sequence was temporally subsampled by displaying the target on an evenly spaced subset of video frames. In the other, the contrast polarity of the stimulus was reversed at a variable rate. We found that threshold under object motion was improved at all speeds by reversing contrast polarity, while temporal subsampling improved resolution at high speeds but impaired performance at low speeds. With simulated ocular motion, thresholds were consistently improved by contrast polarity reversal, but impaired by temporal subsampling. We find that contrast polarity reversal and temporal subsampling produce differential effects on peripheral acuity. Applying contrast polarity reversal may offer a relatively simple image manipulation that could enhance visual performance in individuals with central vision loss.
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spelling pubmed-68715472019-11-27 Temporal modulation improves dynamic peripheral acuity Patrick, Jonathan A. Roach, Neil W. McGraw, Paul V. J Vis Article Macular degeneration and related visual disorders greatly limit foveal function, resulting in reliance on the peripheral retina for tasks requiring fine spatial vision. Here we investigate stimulus manipulations intended to maximize peripheral acuity for dynamic targets. Acuity was measured using a single interval orientation discrimination task at 10° eccentricity. Two types of image motion were investigated along with two different forms of temporal manipulation. Smooth object motion was generated by translating targets along an isoeccentric path at a constant speed (0–20°/s). Ocular motion was simulated by jittering target location using previously recorded fixational eye movement data, amplified by a variable gain factor (0–8). In one stimulus manipulation, the sequence was temporally subsampled by displaying the target on an evenly spaced subset of video frames. In the other, the contrast polarity of the stimulus was reversed at a variable rate. We found that threshold under object motion was improved at all speeds by reversing contrast polarity, while temporal subsampling improved resolution at high speeds but impaired performance at low speeds. With simulated ocular motion, thresholds were consistently improved by contrast polarity reversal, but impaired by temporal subsampling. We find that contrast polarity reversal and temporal subsampling produce differential effects on peripheral acuity. Applying contrast polarity reversal may offer a relatively simple image manipulation that could enhance visual performance in individuals with central vision loss. The Association for Research in Vision and Ophthalmology 2019-11-20 /pmc/articles/PMC6871547/ /pubmed/31747690 http://dx.doi.org/10.1167/19.13.12 Text en Copyright 2019 The Authors http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License.
spellingShingle Article
Patrick, Jonathan A.
Roach, Neil W.
McGraw, Paul V.
Temporal modulation improves dynamic peripheral acuity
title Temporal modulation improves dynamic peripheral acuity
title_full Temporal modulation improves dynamic peripheral acuity
title_fullStr Temporal modulation improves dynamic peripheral acuity
title_full_unstemmed Temporal modulation improves dynamic peripheral acuity
title_short Temporal modulation improves dynamic peripheral acuity
title_sort temporal modulation improves dynamic peripheral acuity
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6871547/
https://www.ncbi.nlm.nih.gov/pubmed/31747690
http://dx.doi.org/10.1167/19.13.12
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