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Directional Bias in the Perception of Cast Shadows
Previous studies have demonstrated that the perception of shading is based upon assumptions about lighting direction, for example, light from above. However, it is not clear whether these assumptions are used in the perception of cast shadows. Moreover, it is unclear whether a perceptual interaction...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
SAGE Publications
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5298568/ https://www.ncbi.nlm.nih.gov/pubmed/28210485 http://dx.doi.org/10.1177/2041669516682267 |
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author | Koizumi, Tomomi Ito, Hiroyuki Sunaga, Shoji Ogawa, Masaki |
author_facet | Koizumi, Tomomi Ito, Hiroyuki Sunaga, Shoji Ogawa, Masaki |
author_sort | Koizumi, Tomomi |
collection | PubMed |
description | Previous studies have demonstrated that the perception of shading is based upon assumptions about lighting direction, for example, light from above. However, it is not clear whether these assumptions are used in the perception of cast shadows. Moreover, it is unclear whether a perceptual interaction exists between shading and cast shadows because until now they have been studied separately. In this study, we investigated through three experiments whether the light-from-above (or another direction) assumption is used in interpreting ambiguous cast shadows, and whether shading information influences the interpretation of cast shadows. Our results indicate the existence of the light-from-above assumption in interpreting cast shadows. Consistent shading information enhanced the interpretation, and judgments of lighting direction were also based on both cast shadow and shading information. However, the perceptual determination of shape from shading was relatively independent of the cast shadow interpretation or the lighting direction judgments of the scene. |
format | Online Article Text |
id | pubmed-5298568 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | SAGE Publications |
record_format | MEDLINE/PubMed |
spelling | pubmed-52985682017-02-16 Directional Bias in the Perception of Cast Shadows Koizumi, Tomomi Ito, Hiroyuki Sunaga, Shoji Ogawa, Masaki Iperception Article Previous studies have demonstrated that the perception of shading is based upon assumptions about lighting direction, for example, light from above. However, it is not clear whether these assumptions are used in the perception of cast shadows. Moreover, it is unclear whether a perceptual interaction exists between shading and cast shadows because until now they have been studied separately. In this study, we investigated through three experiments whether the light-from-above (or another direction) assumption is used in interpreting ambiguous cast shadows, and whether shading information influences the interpretation of cast shadows. Our results indicate the existence of the light-from-above assumption in interpreting cast shadows. Consistent shading information enhanced the interpretation, and judgments of lighting direction were also based on both cast shadow and shading information. However, the perceptual determination of shape from shading was relatively independent of the cast shadow interpretation or the lighting direction judgments of the scene. SAGE Publications 2017-01-01 /pmc/articles/PMC5298568/ /pubmed/28210485 http://dx.doi.org/10.1177/2041669516682267 Text en © The Author(s) 2017 http://creativecommons.org/licenses/by/3.0/ This article is distributed under the terms of the Creative Commons Attribution 3.0 License (http://www.creativecommons.org/licenses/by/3.0/) 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 | Article Koizumi, Tomomi Ito, Hiroyuki Sunaga, Shoji Ogawa, Masaki Directional Bias in the Perception of Cast Shadows |
title | Directional Bias in the Perception of Cast Shadows |
title_full | Directional Bias in the Perception of Cast Shadows |
title_fullStr | Directional Bias in the Perception of Cast Shadows |
title_full_unstemmed | Directional Bias in the Perception of Cast Shadows |
title_short | Directional Bias in the Perception of Cast Shadows |
title_sort | directional bias in the perception of cast shadows |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5298568/ https://www.ncbi.nlm.nih.gov/pubmed/28210485 http://dx.doi.org/10.1177/2041669516682267 |
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