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The Limiting Case of Amodal Completion: The Phenomenal Salience and the Role of Contrast Polarity

In this work, we demonstrated unique and relevant visual properties imparted by contrast polarity in perceptual organization and in eliciting amodal completion, which is the vivid completion of a single continuous object of the visible parts of an occluded shape despite portions of its boundary cont...

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Detalles Bibliográficos
Autores principales: Pinna, Baingio, Conti, Livio
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6627845/
https://www.ncbi.nlm.nih.gov/pubmed/31238584
http://dx.doi.org/10.3390/brainsci9060149
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author Pinna, Baingio
Conti, Livio
author_facet Pinna, Baingio
Conti, Livio
author_sort Pinna, Baingio
collection PubMed
description In this work, we demonstrated unique and relevant visual properties imparted by contrast polarity in perceptual organization and in eliciting amodal completion, which is the vivid completion of a single continuous object of the visible parts of an occluded shape despite portions of its boundary contours not actually being seen. T-junction, good continuation, and closure are considered the main principles involved according to relevant explanations of amodal completion based on the simplicity–Prägnanz principle, Helmholtz’s likelihood, and Bayesian inference. The main interest of these approaches is to explain how the occluded object is completed, what is the amodal shape, and how contours of partially visible fragments are relatable behind an occluder. Different from these perspectives, amodal completion was considered here as a visual phenomenon and not as a process, i.e., the final outcome of perceptual processes and grouping principles. Therefore, the main question we addressed through our stimuli was “What is the role of shape formation and perceptual organization in inducing amodal completion?” To answer this question, novel stimuli, similar to limiting cases and instantiae crucis, were studied through Gestalt experimental phenomenology. The results demonstrated the domination of the contrast polarity against good continuation, T-junctions, and regularity. Moreover, the limiting conditions explored revealed a new kind of junction next to the T- and Y-junctions, respectively responsible for amodal completion and tessellation. We called them I-junctions. The results were theoretically discussed in relation to the previous approaches and in the light of the phenomenal salience imparted by contrast polarity.
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spelling pubmed-66278452019-07-23 The Limiting Case of Amodal Completion: The Phenomenal Salience and the Role of Contrast Polarity Pinna, Baingio Conti, Livio Brain Sci Article In this work, we demonstrated unique and relevant visual properties imparted by contrast polarity in perceptual organization and in eliciting amodal completion, which is the vivid completion of a single continuous object of the visible parts of an occluded shape despite portions of its boundary contours not actually being seen. T-junction, good continuation, and closure are considered the main principles involved according to relevant explanations of amodal completion based on the simplicity–Prägnanz principle, Helmholtz’s likelihood, and Bayesian inference. The main interest of these approaches is to explain how the occluded object is completed, what is the amodal shape, and how contours of partially visible fragments are relatable behind an occluder. Different from these perspectives, amodal completion was considered here as a visual phenomenon and not as a process, i.e., the final outcome of perceptual processes and grouping principles. Therefore, the main question we addressed through our stimuli was “What is the role of shape formation and perceptual organization in inducing amodal completion?” To answer this question, novel stimuli, similar to limiting cases and instantiae crucis, were studied through Gestalt experimental phenomenology. The results demonstrated the domination of the contrast polarity against good continuation, T-junctions, and regularity. Moreover, the limiting conditions explored revealed a new kind of junction next to the T- and Y-junctions, respectively responsible for amodal completion and tessellation. We called them I-junctions. The results were theoretically discussed in relation to the previous approaches and in the light of the phenomenal salience imparted by contrast polarity. MDPI 2019-06-24 /pmc/articles/PMC6627845/ /pubmed/31238584 http://dx.doi.org/10.3390/brainsci9060149 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Pinna, Baingio
Conti, Livio
The Limiting Case of Amodal Completion: The Phenomenal Salience and the Role of Contrast Polarity
title The Limiting Case of Amodal Completion: The Phenomenal Salience and the Role of Contrast Polarity
title_full The Limiting Case of Amodal Completion: The Phenomenal Salience and the Role of Contrast Polarity
title_fullStr The Limiting Case of Amodal Completion: The Phenomenal Salience and the Role of Contrast Polarity
title_full_unstemmed The Limiting Case of Amodal Completion: The Phenomenal Salience and the Role of Contrast Polarity
title_short The Limiting Case of Amodal Completion: The Phenomenal Salience and the Role of Contrast Polarity
title_sort limiting case of amodal completion: the phenomenal salience and the role of contrast polarity
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6627845/
https://www.ncbi.nlm.nih.gov/pubmed/31238584
http://dx.doi.org/10.3390/brainsci9060149
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