Variability of fMRI activation during a phonological and semantic language task in healthy subjects.

Details

Serval ID
serval:BIB_86819A3927E1
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Variability of fMRI activation during a phonological and semantic language task in healthy subjects.
Journal
Human Brain Mapping
Author(s)
Seghier M.L., Lazeyras F., Pegna A.J., Annoni J.M., Zimine I., Mayer E., Michel C.M., Khateb A.
ISSN
1065-9471
Publication state
Published
Issued date
2004
Peer-reviewed
Oui
Volume
23
Number
3
Pages
140-155
Language
english
Notes
Journal Article Research Support, Non-U.S. Gov't --- Old month value: Nov
Abstract
Assessing inter-individual variability of functional activations is of practical importance in the use of functional magnetic resonance imaging (fMRI) in a clinical context. In this fMRI study we addressed this issue in 30 right-handed, healthy subjects using rhyme detection (phonologic) and semantic categorization tasks. Significant activations, found mainly in the left hemisphere, concerned the inferior frontal gyrus, the superior/middle temporal gyri, the prefrontal cortex, the inferior parietal lobe, the superior parietal lobule/superior occipital gyrus, the pre-central gyrus, and the supplementary motor area. Intensity/spatial analysis comparing activations in both tasks revealed an increased involvement of frontal regions in the semantic task and of temporo-parietal regions in the phonologic task. The frequency of activation analyzed in nine regional subdivisions revealed a high inter-subject variability but showed that the most frequently activated regions were the inferior frontal gyrus and the prefrontal cortex. Laterality indices, strongly lateralizing in both tasks, were slightly higher in the semantic (0.76 +/- 0.19) than the phonologic task (0.66 +/- 0.27). Frontal dominance indices (a measure of frontal vs. posterior left hemisphere dominance) indicated more robust frontal activations in the semantic than the phonologic task. Our study allowed the characterization of the most frequently involved foci in two language tasks and showed that the combination of these tasks constitutes a suitable tool for determining language lateralization and for mapping major language areas.
Keywords
Adult, Brain, Brain Mapping, Female, Humans, Language, Magnetic Resonance Imaging, Male, Semantics, Speech Perception
Pubmed
Web of science
Create date
25/01/2008 11:37
Last modification date
20/08/2019 14:45
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