Coding of visual object features and feature conjunctions in the human brain.

Object recognition is achieved through neural mechanisms reliant on the activity of distributed coordinated neural assemblies. In the initial steps of this process, an object's features are thought to be coded very rapidly in distinct neural assemblies. These features play different functional...

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Autores principales:	Jasna Martinovic, Thomas Gruber, Matthias M Müller
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2008
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/26ec2881db1149d1be6b99f506ed9194
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id	oai:doaj.org-article:26ec2881db1149d1be6b99f506ed9194
record_format	dspace
spelling	oai:doaj.org-article:26ec2881db1149d1be6b99f506ed91942021-11-25T06:18:26ZCoding of visual object features and feature conjunctions in the human brain.1932-620310.1371/journal.pone.0003781https://doaj.org/article/26ec2881db1149d1be6b99f506ed91942008-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/19023428/?tool=EBIhttps://doaj.org/toc/1932-6203Object recognition is achieved through neural mechanisms reliant on the activity of distributed coordinated neural assemblies. In the initial steps of this process, an object's features are thought to be coded very rapidly in distinct neural assemblies. These features play different functional roles in the recognition process--while colour facilitates recognition, additional contours and edges delay it. Here, we selectively varied the amount and role of object features in an entry-level categorization paradigm and related them to the electrical activity of the human brain. We found that early synchronizations (approx. 100 ms) increased quantitatively when more image features had to be coded, without reflecting their qualitative contribution to the recognition process. Later activity (approx. 200-400 ms) was modulated by the representational role of object features. These findings demonstrate that although early synchronizations may be sufficient for relatively crude discrimination of objects in visual scenes, they cannot support entry-level categorization. This was subserved by later processes of object model selection, which utilized the representational value of object features such as colour or edges to select the appropriate model and achieve identification.Jasna MartinovicThomas GruberMatthias M MüllerPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 3, Iss 11, p e3781 (2008)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jasna Martinovic Thomas Gruber Matthias M Müller Coding of visual object features and feature conjunctions in the human brain.
description	Object recognition is achieved through neural mechanisms reliant on the activity of distributed coordinated neural assemblies. In the initial steps of this process, an object's features are thought to be coded very rapidly in distinct neural assemblies. These features play different functional roles in the recognition process--while colour facilitates recognition, additional contours and edges delay it. Here, we selectively varied the amount and role of object features in an entry-level categorization paradigm and related them to the electrical activity of the human brain. We found that early synchronizations (approx. 100 ms) increased quantitatively when more image features had to be coded, without reflecting their qualitative contribution to the recognition process. Later activity (approx. 200-400 ms) was modulated by the representational role of object features. These findings demonstrate that although early synchronizations may be sufficient for relatively crude discrimination of objects in visual scenes, they cannot support entry-level categorization. This was subserved by later processes of object model selection, which utilized the representational value of object features such as colour or edges to select the appropriate model and achieve identification.
format	article
author	Jasna Martinovic Thomas Gruber Matthias M Müller
author_facet	Jasna Martinovic Thomas Gruber Matthias M Müller
author_sort	Jasna Martinovic
title	Coding of visual object features and feature conjunctions in the human brain.
title_short	Coding of visual object features and feature conjunctions in the human brain.
title_full	Coding of visual object features and feature conjunctions in the human brain.
title_fullStr	Coding of visual object features and feature conjunctions in the human brain.
title_full_unstemmed	Coding of visual object features and feature conjunctions in the human brain.
title_sort	coding of visual object features and feature conjunctions in the human brain.
publisher	Public Library of Science (PLoS)
publishDate	2008
url	https://doaj.org/article/26ec2881db1149d1be6b99f506ed9194
work_keys_str_mv	AT jasnamartinovic codingofvisualobjectfeaturesandfeatureconjunctionsinthehumanbrain AT thomasgruber codingofvisualobjectfeaturesandfeatureconjunctionsinthehumanbrain AT matthiasmmuller codingofvisualobjectfeaturesandfeatureconjunctionsinthehumanbrain
_version_	1718413912912691200

Coding of visual object features and feature conjunctions in the human brain.

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