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Coding of low-level position and orientation information in human naturalistic vision

Orientation and position of small image segments are considered to be two fundamental low-level attributes in early visual processing, yet their encoding in complex natural stimuli is underexplored. By measuring the just-noticeable differences in noise perturbation, we investigated how orientation a...

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Detalles Bibliográficos
Autores principales: Christensen, Jeppe H., Bex, Peter J., Fiser, József
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6370245/
https://www.ncbi.nlm.nih.gov/pubmed/30742680
http://dx.doi.org/10.1371/journal.pone.0212141
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author Christensen, Jeppe H.
Bex, Peter J.
Fiser, József
author_facet Christensen, Jeppe H.
Bex, Peter J.
Fiser, József
author_sort Christensen, Jeppe H.
collection PubMed
description Orientation and position of small image segments are considered to be two fundamental low-level attributes in early visual processing, yet their encoding in complex natural stimuli is underexplored. By measuring the just-noticeable differences in noise perturbation, we investigated how orientation and position information of a large number of local elements (Gabors) were encoded separately or jointly. Importantly, the Gabors composed various classes of naturalistic stimuli that were equated by all low-level attributes and differed only in their higher-order configural complexity and familiarity. Although unable to consciously tell apart the type of perturbation, observers detected orientation and position noise significantly differently. Furthermore, when the Gabors were perturbed by both types of noise simultaneously, performance adhered to a reliability-based optimal probabilistic combination of individual attribute noises. Our results suggest that orientation and position are independently coded and probabilistically combined for naturalistic stimuli at the earliest stage of visual processing.
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spelling pubmed-63702452019-02-22 Coding of low-level position and orientation information in human naturalistic vision Christensen, Jeppe H. Bex, Peter J. Fiser, József PLoS One Research Article Orientation and position of small image segments are considered to be two fundamental low-level attributes in early visual processing, yet their encoding in complex natural stimuli is underexplored. By measuring the just-noticeable differences in noise perturbation, we investigated how orientation and position information of a large number of local elements (Gabors) were encoded separately or jointly. Importantly, the Gabors composed various classes of naturalistic stimuli that were equated by all low-level attributes and differed only in their higher-order configural complexity and familiarity. Although unable to consciously tell apart the type of perturbation, observers detected orientation and position noise significantly differently. Furthermore, when the Gabors were perturbed by both types of noise simultaneously, performance adhered to a reliability-based optimal probabilistic combination of individual attribute noises. Our results suggest that orientation and position are independently coded and probabilistically combined for naturalistic stimuli at the earliest stage of visual processing. Public Library of Science 2019-02-11 /pmc/articles/PMC6370245/ /pubmed/30742680 http://dx.doi.org/10.1371/journal.pone.0212141 Text en © 2019 Christensen et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Christensen, Jeppe H.
Bex, Peter J.
Fiser, József
Coding of low-level position and orientation information in human naturalistic vision
title Coding of low-level position and orientation information in human naturalistic vision
title_full Coding of low-level position and orientation information in human naturalistic vision
title_fullStr Coding of low-level position and orientation information in human naturalistic vision
title_full_unstemmed Coding of low-level position and orientation information in human naturalistic vision
title_short Coding of low-level position and orientation information in human naturalistic vision
title_sort coding of low-level position and orientation information in human naturalistic vision
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6370245/
https://www.ncbi.nlm.nih.gov/pubmed/30742680
http://dx.doi.org/10.1371/journal.pone.0212141
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