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Infant Perception of Incongruent Shapes in Cast Shadows

A cast shadow occurs when an object blocks the light from an illumination and projects a dark region onto a surface. Previous studies have reported that adults are slower to identify an object when the object has an incongruent cast shadow than when it has a congruent cast shadow (Castiello, 2001)....

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Detalles Bibliográficos
Autores principales: Sato, Kazuki, Kanazawa, So, Yamaguchi, Masami K.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: SAGE Publications 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4950018/
https://www.ncbi.nlm.nih.gov/pubmed/28299167
http://dx.doi.org/10.1068/i0681
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author Sato, Kazuki
Kanazawa, So
Yamaguchi, Masami K.
author_facet Sato, Kazuki
Kanazawa, So
Yamaguchi, Masami K.
author_sort Sato, Kazuki
collection PubMed
description A cast shadow occurs when an object blocks the light from an illumination and projects a dark region onto a surface. Previous studies have reported that adults are slower to identify an object when the object has an incongruent cast shadow than when it has a congruent cast shadow (Castiello, 2001). Here, we used the familiarization-novelty preference procedure to examine whether 5- to 8-month-old infants could detect the relationship between object shapes and cast shadows. In Experiment 1, we examined the infants' ability to detect incongruency between objects and cast shadows. Results showed that 7- to 8-month olds could detect incongruence between the object shapes and the cast shadows, whereas 5- to 6-month olds did not. Yet, our control experiment showed that infants could not detect this incongruence from stimuli in which a white outline had been added to the original cast shadow to decrease the possibility of it being perceived as a cast shadow (Experiment 2). The results of these experiments demonstrate that 7- to 8-month olds responded to the congruence of cast shadows and to consistent contrast polarity between the cast shadow and its background.
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spelling pubmed-49500182017-03-15 Infant Perception of Incongruent Shapes in Cast Shadows Sato, Kazuki Kanazawa, So Yamaguchi, Masami K. Iperception Article A cast shadow occurs when an object blocks the light from an illumination and projects a dark region onto a surface. Previous studies have reported that adults are slower to identify an object when the object has an incongruent cast shadow than when it has a congruent cast shadow (Castiello, 2001). Here, we used the familiarization-novelty preference procedure to examine whether 5- to 8-month-old infants could detect the relationship between object shapes and cast shadows. In Experiment 1, we examined the infants' ability to detect incongruency between objects and cast shadows. Results showed that 7- to 8-month olds could detect incongruence between the object shapes and the cast shadows, whereas 5- to 6-month olds did not. Yet, our control experiment showed that infants could not detect this incongruence from stimuli in which a white outline had been added to the original cast shadow to decrease the possibility of it being perceived as a cast shadow (Experiment 2). The results of these experiments demonstrate that 7- to 8-month olds responded to the congruence of cast shadows and to consistent contrast polarity between the cast shadow and its background. SAGE Publications 2015-04-01 2015-04 /pmc/articles/PMC4950018/ /pubmed/28299167 http://dx.doi.org/10.1068/i0681 Text en © 2015 K Sato, S Kanazawa, MK Yamaguchi Published under a Creative Commons Licence 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 page (http://www.uk.sagepub.com/aboutus/openaccess.htm).
spellingShingle Article
Sato, Kazuki
Kanazawa, So
Yamaguchi, Masami K.
Infant Perception of Incongruent Shapes in Cast Shadows
title Infant Perception of Incongruent Shapes in Cast Shadows
title_full Infant Perception of Incongruent Shapes in Cast Shadows
title_fullStr Infant Perception of Incongruent Shapes in Cast Shadows
title_full_unstemmed Infant Perception of Incongruent Shapes in Cast Shadows
title_short Infant Perception of Incongruent Shapes in Cast Shadows
title_sort infant perception of incongruent shapes in cast shadows
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4950018/
https://www.ncbi.nlm.nih.gov/pubmed/28299167
http://dx.doi.org/10.1068/i0681
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