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Effect of monocular sensitivity on binocular summation of luminance-modulated flicker

Binocular summation of luminance contrast signals in the spatial domain has been investigated in many studies, but less attention has been paid to the analogous interactions in the temporal domain. The present study determined the impact of monocular sensitivity on the binocular detection of luminan...

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Autores principales: Reena Durai, C. Vijay, Hathibelagal, Amithavikram R., Rodriguez-Carmona, Marisa, Barbur, John L., Bharadwaj, Shrikant R.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9873164/
https://www.ncbi.nlm.nih.gov/pubmed/36693078
http://dx.doi.org/10.1371/journal.pone.0280785
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author Reena Durai, C. Vijay
Hathibelagal, Amithavikram R.
Rodriguez-Carmona, Marisa
Barbur, John L.
Bharadwaj, Shrikant R.
author_facet Reena Durai, C. Vijay
Hathibelagal, Amithavikram R.
Rodriguez-Carmona, Marisa
Barbur, John L.
Bharadwaj, Shrikant R.
author_sort Reena Durai, C. Vijay
collection PubMed
description Binocular summation of luminance contrast signals in the spatial domain has been investigated in many studies, but less attention has been paid to the analogous interactions in the temporal domain. The present study determined the impact of monocular sensitivity on the binocular detection of luminance-modulated flickering stimuli. Binocular summation ratios (BSRs) were determined in 13 visually-normal adults for a range of monocular flicker modulation thresholds (FMTs), generated by changing stimulus size (7’– 60’) and luminance (mesopic and photopic). Monocular and binocular FMTs were measured at the point of regard and in each of the four quadrants at 5° eccentricity for each target size and luminance using the Flicker-Plus test. Monocular and binocular FMT’s increased with decreasing target size for all retinal locations (p<0.001), and were overall larger for mesopic than for photopic condition (p<0.001). BSRs for mesopic (mean±SD: 1.50±0.21) and photopic (1.60±0.24) stimuli were greater than unity (p<0.001), with the latter showing larger estimates than former (p<0.001). BSRs showed no significant trend across target sizes for both luminance conditions (p>0.12). The results demonstrate that the visual system successfully summates inputs from the two eyes to enhance flicker detection, independent of their absolute monocular detection thresholds. These findings may serve as a predictive baseline for further experiments designed to determine how other stimulus properties and interocular differences in monocular thresholds may affect the binocular perception of flicker.
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spelling pubmed-98731642023-01-25 Effect of monocular sensitivity on binocular summation of luminance-modulated flicker Reena Durai, C. Vijay Hathibelagal, Amithavikram R. Rodriguez-Carmona, Marisa Barbur, John L. Bharadwaj, Shrikant R. PLoS One Research Article Binocular summation of luminance contrast signals in the spatial domain has been investigated in many studies, but less attention has been paid to the analogous interactions in the temporal domain. The present study determined the impact of monocular sensitivity on the binocular detection of luminance-modulated flickering stimuli. Binocular summation ratios (BSRs) were determined in 13 visually-normal adults for a range of monocular flicker modulation thresholds (FMTs), generated by changing stimulus size (7’– 60’) and luminance (mesopic and photopic). Monocular and binocular FMTs were measured at the point of regard and in each of the four quadrants at 5° eccentricity for each target size and luminance using the Flicker-Plus test. Monocular and binocular FMT’s increased with decreasing target size for all retinal locations (p<0.001), and were overall larger for mesopic than for photopic condition (p<0.001). BSRs for mesopic (mean±SD: 1.50±0.21) and photopic (1.60±0.24) stimuli were greater than unity (p<0.001), with the latter showing larger estimates than former (p<0.001). BSRs showed no significant trend across target sizes for both luminance conditions (p>0.12). The results demonstrate that the visual system successfully summates inputs from the two eyes to enhance flicker detection, independent of their absolute monocular detection thresholds. These findings may serve as a predictive baseline for further experiments designed to determine how other stimulus properties and interocular differences in monocular thresholds may affect the binocular perception of flicker. Public Library of Science 2023-01-24 /pmc/articles/PMC9873164/ /pubmed/36693078 http://dx.doi.org/10.1371/journal.pone.0280785 Text en © 2023 Reena Durai et al https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Reena Durai, C. Vijay
Hathibelagal, Amithavikram R.
Rodriguez-Carmona, Marisa
Barbur, John L.
Bharadwaj, Shrikant R.
Effect of monocular sensitivity on binocular summation of luminance-modulated flicker
title Effect of monocular sensitivity on binocular summation of luminance-modulated flicker
title_full Effect of monocular sensitivity on binocular summation of luminance-modulated flicker
title_fullStr Effect of monocular sensitivity on binocular summation of luminance-modulated flicker
title_full_unstemmed Effect of monocular sensitivity on binocular summation of luminance-modulated flicker
title_short Effect of monocular sensitivity on binocular summation of luminance-modulated flicker
title_sort effect of monocular sensitivity on binocular summation of luminance-modulated flicker
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9873164/
https://www.ncbi.nlm.nih.gov/pubmed/36693078
http://dx.doi.org/10.1371/journal.pone.0280785
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