Stimulus dependency of object-evoked responses in human visual cortex: an inverse problem for category specificity.

Many studies have linked the processing of different object categories to specific event-related potentials (ERPs) such as the face-specific N170. Despite reports showing that object-related ERPs are influenced by visual stimulus features, there is consensus that these components primarily reflect c...

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Autores principales:	Britta Graewe, Peter De Weerd, Reza Farivar, Miguel Castelo-Branco
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2012
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/1a9b7dfdcc3c42eb81f3bf90ffaacaa6
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id	oai:doaj.org-article:1a9b7dfdcc3c42eb81f3bf90ffaacaa6
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spelling	oai:doaj.org-article:1a9b7dfdcc3c42eb81f3bf90ffaacaa62021-11-18T07:27:45ZStimulus dependency of object-evoked responses in human visual cortex: an inverse problem for category specificity.1932-620310.1371/journal.pone.0030727https://doaj.org/article/1a9b7dfdcc3c42eb81f3bf90ffaacaa62012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22363479/?tool=EBIhttps://doaj.org/toc/1932-6203Many studies have linked the processing of different object categories to specific event-related potentials (ERPs) such as the face-specific N170. Despite reports showing that object-related ERPs are influenced by visual stimulus features, there is consensus that these components primarily reflect categorical aspects of the stimuli. Here, we re-investigated this idea by systematically measuring the effects of visual feature manipulations on ERP responses elicited by both structure-from-motion (SFM)-defined and luminance-defined object stimuli. SFM objects elicited a novel component at 200-250 ms (N250) over parietal and posterior temporal sites. We found, however, that the N250 amplitude was unaffected by restructuring SFM stimuli into meaningless objects based on identical visual cues. This suggests that this N250 peak was not uniquely linked to categorical aspects of the objects, but is strongly determined by visual stimulus features. We provide strong support for this hypothesis by parametrically manipulating the depth range of both SFM- and luminance-defined object stimuli and showing that the N250 evoked by SFM stimuli as well as the well-known N170 to static faces were sensitive to this manipulation. Importantly, this effect could not be attributed to compromised object categorization in low depth stimuli, confirming a strong impact of visual stimulus features on object-related ERP signals. As ERP components linked with visual categorical object perception are likely determined by multiple stimulus features, this creates an interesting inverse problem when deriving specific perceptual processes from variations in ERP components.Britta GraewePeter De WeerdReza FarivarMiguel Castelo-BrancoPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 7, Iss 2, p e30727 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Britta Graewe Peter De Weerd Reza Farivar Miguel Castelo-Branco Stimulus dependency of object-evoked responses in human visual cortex: an inverse problem for category specificity.
description	Many studies have linked the processing of different object categories to specific event-related potentials (ERPs) such as the face-specific N170. Despite reports showing that object-related ERPs are influenced by visual stimulus features, there is consensus that these components primarily reflect categorical aspects of the stimuli. Here, we re-investigated this idea by systematically measuring the effects of visual feature manipulations on ERP responses elicited by both structure-from-motion (SFM)-defined and luminance-defined object stimuli. SFM objects elicited a novel component at 200-250 ms (N250) over parietal and posterior temporal sites. We found, however, that the N250 amplitude was unaffected by restructuring SFM stimuli into meaningless objects based on identical visual cues. This suggests that this N250 peak was not uniquely linked to categorical aspects of the objects, but is strongly determined by visual stimulus features. We provide strong support for this hypothesis by parametrically manipulating the depth range of both SFM- and luminance-defined object stimuli and showing that the N250 evoked by SFM stimuli as well as the well-known N170 to static faces were sensitive to this manipulation. Importantly, this effect could not be attributed to compromised object categorization in low depth stimuli, confirming a strong impact of visual stimulus features on object-related ERP signals. As ERP components linked with visual categorical object perception are likely determined by multiple stimulus features, this creates an interesting inverse problem when deriving specific perceptual processes from variations in ERP components.
format	article
author	Britta Graewe Peter De Weerd Reza Farivar Miguel Castelo-Branco
author_facet	Britta Graewe Peter De Weerd Reza Farivar Miguel Castelo-Branco
author_sort	Britta Graewe
title	Stimulus dependency of object-evoked responses in human visual cortex: an inverse problem for category specificity.
title_short	Stimulus dependency of object-evoked responses in human visual cortex: an inverse problem for category specificity.
title_full	Stimulus dependency of object-evoked responses in human visual cortex: an inverse problem for category specificity.
title_fullStr	Stimulus dependency of object-evoked responses in human visual cortex: an inverse problem for category specificity.
title_full_unstemmed	Stimulus dependency of object-evoked responses in human visual cortex: an inverse problem for category specificity.
title_sort	stimulus dependency of object-evoked responses in human visual cortex: an inverse problem for category specificity.
publisher	Public Library of Science (PLoS)
publishDate	2012
url	https://doaj.org/article/1a9b7dfdcc3c42eb81f3bf90ffaacaa6
work_keys_str_mv	AT brittagraewe stimulusdependencyofobjectevokedresponsesinhumanvisualcortexaninverseproblemforcategoryspecificity AT peterdeweerd stimulusdependencyofobjectevokedresponsesinhumanvisualcortexaninverseproblemforcategoryspecificity AT rezafarivar stimulusdependencyofobjectevokedresponsesinhumanvisualcortexaninverseproblemforcategoryspecificity AT miguelcastelobranco stimulusdependencyofobjectevokedresponsesinhumanvisualcortexaninverseproblemforcategoryspecificity
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Stimulus dependency of object-evoked responses in human visual cortex: an inverse problem for category specificity.

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