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| Research article summary (published 29 Jun 2003): |
Semantic categorization in the human brain: spatiotemporal dynamics revealed by magnetoencephalography.
Full Abstract
We examined the cortical representation of semantic categorization using magnetic source imaging in a task that revealed both dissociations among superordinate categories and associations among different base-level concepts within these categories. Around 200 ms after stimulus onset, the spatiotemporal correlation of brain activity elicited by base-level concepts was greater within than across superordinate categories in the right temporal lobe. Unsupervised clustering of data showed similar categorization between 210 and 450 ms mainly in the left hemisphere. This pattern suggests that well-defined semantic categories are represented in spatially distinct, macroscopically separable neural networks, independent of physical stimulus properties. In contrast, a broader, task-required categorization (natural/man-made) was not evident in our data. The perceptual dynamics of the categorization process is initially evident in the extrastriate areas of the right hemisphere; this activation is followed by higher-level activity along the ventral processing stream, implicating primarily the left temporal lobe.
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Author information
Author/s: Löw, Andreas (A); Bentin, Shlomo (S); Rockstroh, Brigitte (B); Silberman, Yaron (Y); Gomolla, Annette (A); Cohen, Rudolf (R); Elbert, Thomas (T);
Affiliation: University of Konstanz, Konstanz, Germany. loew@ufl.edu
Journal and publication information
Publication Type: Journal Article; Research Support, Non-U.S. Gov't
Journal: Psychological science : a journal of the American Psychological Society / APS (Psychol Sci), published in United States. (Language: eng)
Reference: 2003-Jul; vol 14 (issue 4) : pp 367-72
Dates: Created 2003/06/16; Completed 2003/09/29; Revised 2006/11/15;
PMID: 12807412, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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