Task and spatial frequency modulations of object processing: an EEG study.

Visual object processing may follow a coarse-to-fine sequence imposed by fast processing of low spatial frequencies (LSF) and slow processing of high spatial frequencies (HSF). Objects can be categorized at varying levels of specificity: the superordinate (e.g. animal), the basic (e.g. dog), or the...

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Autores principales:	Matt Craddock, Jasna Martinovic, Matthias M Müller
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2013
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/87c36e7e2d7046ada312a03993537dfd
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id	oai:doaj.org-article:87c36e7e2d7046ada312a03993537dfd
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spelling	oai:doaj.org-article:87c36e7e2d7046ada312a03993537dfd2021-11-18T09:01:48ZTask and spatial frequency modulations of object processing: an EEG study.1932-620310.1371/journal.pone.0070293https://doaj.org/article/87c36e7e2d7046ada312a03993537dfd2013-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23936181/?tool=EBIhttps://doaj.org/toc/1932-6203Visual object processing may follow a coarse-to-fine sequence imposed by fast processing of low spatial frequencies (LSF) and slow processing of high spatial frequencies (HSF). Objects can be categorized at varying levels of specificity: the superordinate (e.g. animal), the basic (e.g. dog), or the subordinate (e.g. Border Collie). We tested whether superordinate and more specific categorization depend on different spatial frequency ranges, and whether any such dependencies might be revealed by or influence signals recorded using EEG. We used event-related potentials (ERPs) and time-frequency (TF) analysis to examine the time course of object processing while participants performed either a grammatical gender-classification task (which generally forces basic-level categorization) or a living/non-living judgement (superordinate categorization) on everyday, real-life objects. Objects were filtered to contain only HSF or LSF. We found a greater positivity and greater negativity for HSF than for LSF pictures in the P1 and N1 respectively, but no effects of task on either component. A later, fronto-central negativity (N350) was more negative in the gender-classification task than the superordinate categorization task, which may indicate that this component relates to semantic or syntactic processing. We found no significant effects of task or spatial frequency on evoked or total gamma band responses. Our results demonstrate early differences in processing of HSF and LSF content that were not modulated by categorization task, with later responses reflecting such higher-level cognitive factors.Matt CraddockJasna MartinovicMatthias M MüllerPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 8, Iss 7, p e70293 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Matt Craddock Jasna Martinovic Matthias M Müller Task and spatial frequency modulations of object processing: an EEG study.
description	Visual object processing may follow a coarse-to-fine sequence imposed by fast processing of low spatial frequencies (LSF) and slow processing of high spatial frequencies (HSF). Objects can be categorized at varying levels of specificity: the superordinate (e.g. animal), the basic (e.g. dog), or the subordinate (e.g. Border Collie). We tested whether superordinate and more specific categorization depend on different spatial frequency ranges, and whether any such dependencies might be revealed by or influence signals recorded using EEG. We used event-related potentials (ERPs) and time-frequency (TF) analysis to examine the time course of object processing while participants performed either a grammatical gender-classification task (which generally forces basic-level categorization) or a living/non-living judgement (superordinate categorization) on everyday, real-life objects. Objects were filtered to contain only HSF or LSF. We found a greater positivity and greater negativity for HSF than for LSF pictures in the P1 and N1 respectively, but no effects of task on either component. A later, fronto-central negativity (N350) was more negative in the gender-classification task than the superordinate categorization task, which may indicate that this component relates to semantic or syntactic processing. We found no significant effects of task or spatial frequency on evoked or total gamma band responses. Our results demonstrate early differences in processing of HSF and LSF content that were not modulated by categorization task, with later responses reflecting such higher-level cognitive factors.
format	article
author	Matt Craddock Jasna Martinovic Matthias M Müller
author_facet	Matt Craddock Jasna Martinovic Matthias M Müller
author_sort	Matt Craddock
title	Task and spatial frequency modulations of object processing: an EEG study.
title_short	Task and spatial frequency modulations of object processing: an EEG study.
title_full	Task and spatial frequency modulations of object processing: an EEG study.
title_fullStr	Task and spatial frequency modulations of object processing: an EEG study.
title_full_unstemmed	Task and spatial frequency modulations of object processing: an EEG study.
title_sort	task and spatial frequency modulations of object processing: an eeg study.
publisher	Public Library of Science (PLoS)
publishDate	2013
url	https://doaj.org/article/87c36e7e2d7046ada312a03993537dfd
work_keys_str_mv	AT mattcraddock taskandspatialfrequencymodulationsofobjectprocessinganeegstudy AT jasnamartinovic taskandspatialfrequencymodulationsofobjectprocessinganeegstudy AT matthiasmmuller taskandspatialfrequencymodulationsofobjectprocessinganeegstudy
_version_	1718421033269067776

Task and spatial frequency modulations of object processing: an EEG study.

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