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The Temporal Window of Visual Processing in Aging

PURPOSE: Aging affects a variety of visual functions. In this study, we aim to quantitatively investigate the temporal characteristics of visual processing in aging. METHODS: Twelve younger (24.1 ± 1.6 years) and 12 older observers (58.4 ± 3.6 years) participated in the study. All participants had n...

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Autores principales: He, Xianghang, Shen, Menglu, Cui, Rong, Zheng, Haiyan, Ruan, Xiaowei, Lu, Zhong-Lin, Hou, Fang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Association for Research in Vision and Ophthalmology 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7405705/
https://www.ncbi.nlm.nih.gov/pubmed/32462200
http://dx.doi.org/10.1167/iovs.61.5.60
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author He, Xianghang
Shen, Menglu
Cui, Rong
Zheng, Haiyan
Ruan, Xiaowei
Lu, Zhong-Lin
Hou, Fang
author_facet He, Xianghang
Shen, Menglu
Cui, Rong
Zheng, Haiyan
Ruan, Xiaowei
Lu, Zhong-Lin
Hou, Fang
author_sort He, Xianghang
collection PubMed
description PURPOSE: Aging affects a variety of visual functions. In this study, we aim to quantitatively investigate the temporal characteristics of visual processing in aging. METHODS: Twelve younger (24.1 ± 1.6 years) and 12 older observers (58.4 ± 3.6 years) participated in the study. All participants had normal or corrected-to-normal vision. The contrast thresholds of the participants were measured using an orientation discrimination task with white external noise masks. The target-mask stimulus onset asynchronies were 16.7 ms, 33.4 ms, 50.0 ms, 83.4 ms, and ∞ (no external noise masks) in separate conditions. The signal stimulus was carefully chosen such that it was equally visible for the younger and older participants. An elaborated perceptual template model (ePTM) was fit to the data of each participant. RESULTS: Without masks, there was no difference in contrast thresholds between the younger and older groups (P = 0.707). With masks, contrast thresholds in the older group elevated more than those in the younger group, and the pattern of threshold elevation differed in the two groups. The ePTM fitted the data well, with the older observers having lower template gains than the younger observers (P = 3.58 × 10(−6)). A further analysis of the weight parameters of the temporal window revealed that the older observers had a flatter temporal window than the younger observers (P = 0.025). CONCLUSIONS: Age-related temporal processing deficits were found in older observers with normal contrast sensitivity to the signal stimuli. The deficits were accounted for by the inferior temporal processing window of the visual system in aging.
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spelling pubmed-74057052020-08-19 The Temporal Window of Visual Processing in Aging He, Xianghang Shen, Menglu Cui, Rong Zheng, Haiyan Ruan, Xiaowei Lu, Zhong-Lin Hou, Fang Invest Ophthalmol Vis Sci Visual Psychophysics and Physiological Optics PURPOSE: Aging affects a variety of visual functions. In this study, we aim to quantitatively investigate the temporal characteristics of visual processing in aging. METHODS: Twelve younger (24.1 ± 1.6 years) and 12 older observers (58.4 ± 3.6 years) participated in the study. All participants had normal or corrected-to-normal vision. The contrast thresholds of the participants were measured using an orientation discrimination task with white external noise masks. The target-mask stimulus onset asynchronies were 16.7 ms, 33.4 ms, 50.0 ms, 83.4 ms, and ∞ (no external noise masks) in separate conditions. The signal stimulus was carefully chosen such that it was equally visible for the younger and older participants. An elaborated perceptual template model (ePTM) was fit to the data of each participant. RESULTS: Without masks, there was no difference in contrast thresholds between the younger and older groups (P = 0.707). With masks, contrast thresholds in the older group elevated more than those in the younger group, and the pattern of threshold elevation differed in the two groups. The ePTM fitted the data well, with the older observers having lower template gains than the younger observers (P = 3.58 × 10(−6)). A further analysis of the weight parameters of the temporal window revealed that the older observers had a flatter temporal window than the younger observers (P = 0.025). CONCLUSIONS: Age-related temporal processing deficits were found in older observers with normal contrast sensitivity to the signal stimuli. The deficits were accounted for by the inferior temporal processing window of the visual system in aging. The Association for Research in Vision and Ophthalmology 2020-05-27 /pmc/articles/PMC7405705/ /pubmed/32462200 http://dx.doi.org/10.1167/iovs.61.5.60 Text en Copyright 2020 The Authors 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 Visual Psychophysics and Physiological Optics
He, Xianghang
Shen, Menglu
Cui, Rong
Zheng, Haiyan
Ruan, Xiaowei
Lu, Zhong-Lin
Hou, Fang
The Temporal Window of Visual Processing in Aging
title The Temporal Window of Visual Processing in Aging
title_full The Temporal Window of Visual Processing in Aging
title_fullStr The Temporal Window of Visual Processing in Aging
title_full_unstemmed The Temporal Window of Visual Processing in Aging
title_short The Temporal Window of Visual Processing in Aging
title_sort temporal window of visual processing in aging
topic Visual Psychophysics and Physiological Optics
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7405705/
https://www.ncbi.nlm.nih.gov/pubmed/32462200
http://dx.doi.org/10.1167/iovs.61.5.60
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