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Lightness Discrimination Depends More on Bright Rather Than Shaded Regions of Three-Dimensional Objects
The brighter portions of a shaded complex object are in principle more informative about its lightness and are preferentially fixated during lightness judgments. In this study, we investigate whether preventing this strategy also has measurable detrimental effects on performance. Observers were pres...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
SAGE Publications
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6876175/ https://www.ncbi.nlm.nih.gov/pubmed/31803462 http://dx.doi.org/10.1177/2041669519884335 |
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author | Toscani, Matteo Valsecchi, Matteo |
author_facet | Toscani, Matteo Valsecchi, Matteo |
author_sort | Toscani, Matteo |
collection | PubMed |
description | The brighter portions of a shaded complex object are in principle more informative about its lightness and are preferentially fixated during lightness judgments. In this study, we investigate whether preventing this strategy also has measurable detrimental effects on performance. Observers were presented with a reference and a comparison three-dimensional rendered object and had to choose which one was “painted with a lighter gray.” The comparison was rendered with different diffuse reflectance values. We compared precision between three different conditions: full image, 20% of the lightest pixels removed, or 20% of the darkest pixels removed. Removing the bright pixels maximally impaired performance. The results confirm that the strategy of relying on the brightest areas of a complex object in order to estimate lightness is functionally optimal, yielding more precise representations. |
format | Online Article Text |
id | pubmed-6876175 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | SAGE Publications |
record_format | MEDLINE/PubMed |
spelling | pubmed-68761752019-12-04 Lightness Discrimination Depends More on Bright Rather Than Shaded Regions of Three-Dimensional Objects Toscani, Matteo Valsecchi, Matteo Iperception Short Report The brighter portions of a shaded complex object are in principle more informative about its lightness and are preferentially fixated during lightness judgments. In this study, we investigate whether preventing this strategy also has measurable detrimental effects on performance. Observers were presented with a reference and a comparison three-dimensional rendered object and had to choose which one was “painted with a lighter gray.” The comparison was rendered with different diffuse reflectance values. We compared precision between three different conditions: full image, 20% of the lightest pixels removed, or 20% of the darkest pixels removed. Removing the bright pixels maximally impaired performance. The results confirm that the strategy of relying on the brightest areas of a complex object in order to estimate lightness is functionally optimal, yielding more precise representations. SAGE Publications 2019-11-22 /pmc/articles/PMC6876175/ /pubmed/31803462 http://dx.doi.org/10.1177/2041669519884335 Text en © The Author(s) 2019 http://creativecommons.org/licenses/by/4.0/ Creative Commons CC BY: This article is distributed under the terms of the Creative Commons Attribution 4.0 License (http://www.creativecommons.org/licenses/by/4.0/) which permits any use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage). |
spellingShingle | Short Report Toscani, Matteo Valsecchi, Matteo Lightness Discrimination Depends More on Bright Rather Than Shaded Regions of Three-Dimensional Objects |
title | Lightness Discrimination Depends More on Bright Rather Than Shaded Regions of Three-Dimensional Objects |
title_full | Lightness Discrimination Depends More on Bright Rather Than Shaded Regions of Three-Dimensional Objects |
title_fullStr | Lightness Discrimination Depends More on Bright Rather Than Shaded Regions of Three-Dimensional Objects |
title_full_unstemmed | Lightness Discrimination Depends More on Bright Rather Than Shaded Regions of Three-Dimensional Objects |
title_short | Lightness Discrimination Depends More on Bright Rather Than Shaded Regions of Three-Dimensional Objects |
title_sort | lightness discrimination depends more on bright rather than shaded regions of three-dimensional objects |
topic | Short Report |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6876175/ https://www.ncbi.nlm.nih.gov/pubmed/31803462 http://dx.doi.org/10.1177/2041669519884335 |
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