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A temporal window for estimating surface brightness in the Craik-O'Brien-Cornsweet effect
The central edge of an opposing pair of luminance gradients (COC edge) makes adjoining regions with identical luminance appear to be different. This brightness illusion, called the Craik-O'Brien-Cornsweet effect (COCe), can be explained by low-level spatial filtering mechanisms (Dakin and Bex,...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Frontiers Media S.A.
2014
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4217394/ https://www.ncbi.nlm.nih.gov/pubmed/25404904 http://dx.doi.org/10.3389/fnhum.2014.00855 |
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author | Masuda, Ayako Watanabe, Junji Terao, Masahiko Yagi, Akihiro Maruya, Kazushi |
author_facet | Masuda, Ayako Watanabe, Junji Terao, Masahiko Yagi, Akihiro Maruya, Kazushi |
author_sort | Masuda, Ayako |
collection | PubMed |
description | The central edge of an opposing pair of luminance gradients (COC edge) makes adjoining regions with identical luminance appear to be different. This brightness illusion, called the Craik-O'Brien-Cornsweet effect (COCe), can be explained by low-level spatial filtering mechanisms (Dakin and Bex, 2003). Also, the COCe is greatly reduced when the stimulus lacks a frame element surrounding the COC edge (Purves et al., 1999). This indicates that the COCe can be modulated by extra contextual cues that are related to ideas about lighting priors. In this study, we examined whether processing for contextual modulation could be independent of the main COCe processing mediated by the filtering mechanism. We displayed the COC edge and frame element at physically different times. Then, while varying the onset asynchrony between them and changing the luminance contrast of the frame element, we measured the size of the COCe. We found that the COCe was observed in the temporal range of around 600–800 ms centered at the 0 ms (from around −400 to 400 ms in stimulus onset asynchrony), which was much larger than the range of typical visual persistency. More importantly, this temporal range did not change significantly regardless of differences in the luminance contrast of the frame element (5–100%), in the durations of COC edge and/or the frame element (50 or 200 ms), in the display condition (interocular or binocular), and in the type of lines constituting the frame element (solid or illusory lines). Results suggest that the visual system can bind the COC edge and frame element with a temporal window of ~1 s to estimate surface brightness. Information from the basic filtering mechanism and information of contextual cue are separately processed and are linked afterwards. |
format | Online Article Text |
id | pubmed-4217394 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2014 |
publisher | Frontiers Media S.A. |
record_format | MEDLINE/PubMed |
spelling | pubmed-42173942014-11-17 A temporal window for estimating surface brightness in the Craik-O'Brien-Cornsweet effect Masuda, Ayako Watanabe, Junji Terao, Masahiko Yagi, Akihiro Maruya, Kazushi Front Hum Neurosci Neuroscience The central edge of an opposing pair of luminance gradients (COC edge) makes adjoining regions with identical luminance appear to be different. This brightness illusion, called the Craik-O'Brien-Cornsweet effect (COCe), can be explained by low-level spatial filtering mechanisms (Dakin and Bex, 2003). Also, the COCe is greatly reduced when the stimulus lacks a frame element surrounding the COC edge (Purves et al., 1999). This indicates that the COCe can be modulated by extra contextual cues that are related to ideas about lighting priors. In this study, we examined whether processing for contextual modulation could be independent of the main COCe processing mediated by the filtering mechanism. We displayed the COC edge and frame element at physically different times. Then, while varying the onset asynchrony between them and changing the luminance contrast of the frame element, we measured the size of the COCe. We found that the COCe was observed in the temporal range of around 600–800 ms centered at the 0 ms (from around −400 to 400 ms in stimulus onset asynchrony), which was much larger than the range of typical visual persistency. More importantly, this temporal range did not change significantly regardless of differences in the luminance contrast of the frame element (5–100%), in the durations of COC edge and/or the frame element (50 or 200 ms), in the display condition (interocular or binocular), and in the type of lines constituting the frame element (solid or illusory lines). Results suggest that the visual system can bind the COC edge and frame element with a temporal window of ~1 s to estimate surface brightness. Information from the basic filtering mechanism and information of contextual cue are separately processed and are linked afterwards. Frontiers Media S.A. 2014-11-03 /pmc/articles/PMC4217394/ /pubmed/25404904 http://dx.doi.org/10.3389/fnhum.2014.00855 Text en Copyright © 2014 Masuda, Watanabe, Terao, Yagi and Maruya. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
spellingShingle | Neuroscience Masuda, Ayako Watanabe, Junji Terao, Masahiko Yagi, Akihiro Maruya, Kazushi A temporal window for estimating surface brightness in the Craik-O'Brien-Cornsweet effect |
title | A temporal window for estimating surface brightness in the Craik-O'Brien-Cornsweet effect |
title_full | A temporal window for estimating surface brightness in the Craik-O'Brien-Cornsweet effect |
title_fullStr | A temporal window for estimating surface brightness in the Craik-O'Brien-Cornsweet effect |
title_full_unstemmed | A temporal window for estimating surface brightness in the Craik-O'Brien-Cornsweet effect |
title_short | A temporal window for estimating surface brightness in the Craik-O'Brien-Cornsweet effect |
title_sort | temporal window for estimating surface brightness in the craik-o'brien-cornsweet effect |
topic | Neuroscience |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4217394/ https://www.ncbi.nlm.nih.gov/pubmed/25404904 http://dx.doi.org/10.3389/fnhum.2014.00855 |
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