First, you need a Gestalt: An interaction of bottom-up and top-down streams during the perception of the ambiguously rotating human walker

Abstract Our visual system combines sensory evidence with prior knowledge to produce a representation of an outside world. Here, we explored the limits of the feedforward computation using an ambiguously rotating human biological motion. Specifically, we investigated whether an overall rotation, whi...

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Autor principal:	Alexander Pastukhov
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f89dad4c0ad946cdb5a3a308f17d5996
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spelling	oai:doaj.org-article:f89dad4c0ad946cdb5a3a308f17d59962021-12-02T12:32:12ZFirst, you need a Gestalt: An interaction of bottom-up and top-down streams during the perception of the ambiguously rotating human walker10.1038/s41598-017-01376-12045-2322https://doaj.org/article/f89dad4c0ad946cdb5a3a308f17d59962017-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01376-1https://doaj.org/toc/2045-2322Abstract Our visual system combines sensory evidence with prior knowledge to produce a representation of an outside world. Here, we explored the limits of the feedforward computation using an ambiguously rotating human biological motion. Specifically, we investigated whether an overall rotation, which was added to all the displays used in the study, would be perceived when the point-light walker was presented upside-down, a condition that typically obliterates perception of a human Gestalt. We report that inversion of the point-light walker or the absence of an identifiable Gestalt abolished the perception of an overall rotation. Perception of rotation was restored if the human walker Gestalt could be identified (an upright walker), if observers were informed about the nature of the motion display, or if observers expected to see the rotation of an unknown dynamic object. This implies that a mathematically more complex human motion was accounted for before the remaining motion components could be used to infer an overall rotation. Our results indicate that the perceptual inference does not proceed in a hierarchical manner with the simpler components being identified first. Instead, prior knowledge acts as a starting point for the decomposition of an even relatively simple combination of two motions.Alexander PastukhovNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Alexander Pastukhov First, you need a Gestalt: An interaction of bottom-up and top-down streams during the perception of the ambiguously rotating human walker
description	Abstract Our visual system combines sensory evidence with prior knowledge to produce a representation of an outside world. Here, we explored the limits of the feedforward computation using an ambiguously rotating human biological motion. Specifically, we investigated whether an overall rotation, which was added to all the displays used in the study, would be perceived when the point-light walker was presented upside-down, a condition that typically obliterates perception of a human Gestalt. We report that inversion of the point-light walker or the absence of an identifiable Gestalt abolished the perception of an overall rotation. Perception of rotation was restored if the human walker Gestalt could be identified (an upright walker), if observers were informed about the nature of the motion display, or if observers expected to see the rotation of an unknown dynamic object. This implies that a mathematically more complex human motion was accounted for before the remaining motion components could be used to infer an overall rotation. Our results indicate that the perceptual inference does not proceed in a hierarchical manner with the simpler components being identified first. Instead, prior knowledge acts as a starting point for the decomposition of an even relatively simple combination of two motions.
format	article
author	Alexander Pastukhov
author_facet	Alexander Pastukhov
author_sort	Alexander Pastukhov
title	First, you need a Gestalt: An interaction of bottom-up and top-down streams during the perception of the ambiguously rotating human walker
title_short	First, you need a Gestalt: An interaction of bottom-up and top-down streams during the perception of the ambiguously rotating human walker
title_full	First, you need a Gestalt: An interaction of bottom-up and top-down streams during the perception of the ambiguously rotating human walker
title_fullStr	First, you need a Gestalt: An interaction of bottom-up and top-down streams during the perception of the ambiguously rotating human walker
title_full_unstemmed	First, you need a Gestalt: An interaction of bottom-up and top-down streams during the perception of the ambiguously rotating human walker
title_sort	first, you need a gestalt: an interaction of bottom-up and top-down streams during the perception of the ambiguously rotating human walker
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/f89dad4c0ad946cdb5a3a308f17d5996
work_keys_str_mv	AT alexanderpastukhov firstyouneedagestaltaninteractionofbottomupandtopdownstreamsduringtheperceptionoftheambiguouslyrotatinghumanwalker
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First, you need a Gestalt: An interaction of bottom-up and top-down streams during the perception of the ambiguously rotating human walker

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