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Abrupt darkening under high dynamic range (HDR) luminance invokes facilitation for high-contrast targets and grouping by luminance similarity
When scanning across a scene, luminance can vary by up to 100,000-to-1 (high dynamic range, HDR), requiring multiple normalizing mechanisms spanning from the retina to the cortex to support visual acuity and recognition. Vision models based on standard dynamic range (SDR) luminance contrast ratios b...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Association for Research in Vision and Ophthalmology
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7424107/ https://www.ncbi.nlm.nih.gov/pubmed/32663253 http://dx.doi.org/10.1167/jov.20.7.9 |
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author | Hung, Chou P. Callahan-Flintoft, Chloe Fedele, Paul D. Fluitt, Kim F. Odoemene, Onyekachi Walker, Anthony J. Harrison, Andre V. Vaughan, Barry D. Jaswa, Matthew S. Wei, Min |
author_facet | Hung, Chou P. Callahan-Flintoft, Chloe Fedele, Paul D. Fluitt, Kim F. Odoemene, Onyekachi Walker, Anthony J. Harrison, Andre V. Vaughan, Barry D. Jaswa, Matthew S. Wei, Min |
author_sort | Hung, Chou P. |
collection | PubMed |
description | When scanning across a scene, luminance can vary by up to 100,000-to-1 (high dynamic range, HDR), requiring multiple normalizing mechanisms spanning from the retina to the cortex to support visual acuity and recognition. Vision models based on standard dynamic range (SDR) luminance contrast ratios below 100-to-1 have limited ability to generalize to real-world scenes with HDR luminance. To characterize how orientation and luminance are linked in brain mechanisms for luminance normalization, we measured orientation discrimination of Gabor targets under HDR luminance dynamics. We report a novel phenomenon, that abrupt 10- to 100-fold darkening engages contextual facilitation, distorting the apparent orientation of a high-contrast central target. Surprisingly, facilitation was influenced by grouping by luminance similarity, as well as by the degree of luminance variability in the surround. These results challenge vision models based solely on activity normalization and raise new questions that will lead to models that perform better in real-world scenes. |
format | Online Article Text |
id | pubmed-7424107 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | The Association for Research in Vision and Ophthalmology |
record_format | MEDLINE/PubMed |
spelling | pubmed-74241072020-08-26 Abrupt darkening under high dynamic range (HDR) luminance invokes facilitation for high-contrast targets and grouping by luminance similarity Hung, Chou P. Callahan-Flintoft, Chloe Fedele, Paul D. Fluitt, Kim F. Odoemene, Onyekachi Walker, Anthony J. Harrison, Andre V. Vaughan, Barry D. Jaswa, Matthew S. Wei, Min J Vis Article When scanning across a scene, luminance can vary by up to 100,000-to-1 (high dynamic range, HDR), requiring multiple normalizing mechanisms spanning from the retina to the cortex to support visual acuity and recognition. Vision models based on standard dynamic range (SDR) luminance contrast ratios below 100-to-1 have limited ability to generalize to real-world scenes with HDR luminance. To characterize how orientation and luminance are linked in brain mechanisms for luminance normalization, we measured orientation discrimination of Gabor targets under HDR luminance dynamics. We report a novel phenomenon, that abrupt 10- to 100-fold darkening engages contextual facilitation, distorting the apparent orientation of a high-contrast central target. Surprisingly, facilitation was influenced by grouping by luminance similarity, as well as by the degree of luminance variability in the surround. These results challenge vision models based solely on activity normalization and raise new questions that will lead to models that perform better in real-world scenes. The Association for Research in Vision and Ophthalmology 2020-07-14 /pmc/articles/PMC7424107/ /pubmed/32663253 http://dx.doi.org/10.1167/jov.20.7.9 Text en Copyright 2020 The Authors http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. |
spellingShingle | Article Hung, Chou P. Callahan-Flintoft, Chloe Fedele, Paul D. Fluitt, Kim F. Odoemene, Onyekachi Walker, Anthony J. Harrison, Andre V. Vaughan, Barry D. Jaswa, Matthew S. Wei, Min Abrupt darkening under high dynamic range (HDR) luminance invokes facilitation for high-contrast targets and grouping by luminance similarity |
title | Abrupt darkening under high dynamic range (HDR) luminance invokes facilitation for high-contrast targets and grouping by luminance similarity |
title_full | Abrupt darkening under high dynamic range (HDR) luminance invokes facilitation for high-contrast targets and grouping by luminance similarity |
title_fullStr | Abrupt darkening under high dynamic range (HDR) luminance invokes facilitation for high-contrast targets and grouping by luminance similarity |
title_full_unstemmed | Abrupt darkening under high dynamic range (HDR) luminance invokes facilitation for high-contrast targets and grouping by luminance similarity |
title_short | Abrupt darkening under high dynamic range (HDR) luminance invokes facilitation for high-contrast targets and grouping by luminance similarity |
title_sort | abrupt darkening under high dynamic range (hdr) luminance invokes facilitation for high-contrast targets and grouping by luminance similarity |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7424107/ https://www.ncbi.nlm.nih.gov/pubmed/32663253 http://dx.doi.org/10.1167/jov.20.7.9 |
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