Document Detail


Multiple scales of organization for object selectivity in ventral visual cortex.
MedLine Citation:
PMID:  21376816     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Object knowledge is hierarchical. Several hypotheses have proposed that this property might be reflected in the spatial organization of ventral visual cortex. For example, all exemplars of a category might activate the same patches of cortex, but with a slightly different position of the peak of activation in each patch. According to this view, category selectivity would be organized at a larger spatial scale compared to exemplar selectivity. No empirical evidence for such proposals is available from experiments with human subjects. Here, we compare the relative scale of organization for category and exemplar selectivity in two datasets with two methods: (i) by investigating the previously reported beneficial effect of spatial smoothing of the fMRI data on the reliability of multi-voxel selectivity patterns; and (ii) by comparing the relative weight of lower and higher spatial frequencies in the spatial frequency spectrum of these selectivity patterns. The findings are consistent with the proposal that selectivity for stimulus properties that underlie finer distinctions between objects is organized at a finer scale than selectivity for stimulus properties that differentiate categories. This finding confirms the existence of multiple scales of organization in the ventral visual pathway.
Authors:
Marijke Brants; Annelies Baeck; Johan Wagemans; Hans P Op de Beeck
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-3-2
Journal Detail:
Title:  NeuroImage     Volume:  -     ISSN:  1095-9572     ISO Abbreviation:  -     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-3-7     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9215515     Medline TA:  Neuroimage     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2010. Published by Elsevier Inc.
Affiliation:
Laboratory of Biological Psychology, University of Leuven (K.U.Leuven), Tiensestraat 102, B-3000 Leuven, Belgium; Laboratory of Experimental Psychology, University of Leuven (K.U.Leuven), Tiensestraat, 102 B-3000 Leuven, Belgium.
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