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| Research article summary (published 30 Mar 2002): |
Semantic category interference in overt picture naming: sharpening current density localization by PCA.
Full Abstract
The study investigated the neuronal basis of the retrieval of words from the mental lexicon. The semantic category interference effect was used to locate lexical retrieval processes in time and space. This effect reflects the finding that, for overt naming, volunteers are slower when naming pictures out of a sequence of items from the same semantic category than from different categories. Participants named pictures blockwise either in the context of same- or mixed-category items while the brain response was registered using magnetoencephalography (MEG). Fifteen out of 20 participants showed longer response latencies in the same-category compared to the mixed-category condition. Event-related MEG signals for the participants demonstrating the interference effect were submitted to a current source density (CSD) analysis. As a new approach, a principal component analysis was applied to decompose the grand average CSD distribution into spatial subcomponents (factors). The spatial factor indicating left temporal activity revealed significantly different activation for the same-category compared to the mixed-category condition in the time window between 150 and 225 msec post picture onset. These findings indicate a major involvement of the left temporal cortex in the semantic interference effect. As this effect has been shown to take place at the level of lexical selection, the data suggest that the left temporal cortex supports processes of lexical retrieval during production.
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Author information
Author/s: Maess, Burkhard (B); Friederici, Angela D (AD); Damian, Markus (M); Meyer, Antje S (AS); Levelt, Willem J M (WJ);
Affiliation: Max Planck Institute of Cognitive Neuroscience, P.O. Box 500 355, D-04303 Leipzig, Germany. maess@cns.mpg.de
Journal and publication information
Publication Type: Journal Article; Research Support, Non-U.S. Gov't
Journal: Journal of cognitive neuroscience (J Cogn Neurosci), published in United States. (Language: eng)
Reference: 2002-Apr; vol 14 (issue 3) : pp 455-62
Dates: Created 2002/04/23; Completed 2002/05/22; Revised 2006/11/15;
PMID: 11970804, 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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