Catalog Home Page

Differential activation of frontal lobe areas by lexical and semantic language tasks: A functional magnetic resonance imaging study

Blacker, D., Byrnes, M.L., Mastaglia, F.L. and Thickbroom, G.W. (2006) Differential activation of frontal lobe areas by lexical and semantic language tasks: A functional magnetic resonance imaging study. Journal of Clinical Neuroscience, 13 (1). pp. 91-95.

Link to Published Version: http://dx.doi.org/10.1016/j.jocn.2005.02.009
*Subscription may be required

Abstract

To determine whether frontal lobe regions, including Broca’s area, dorsolateral prefrontal cortex (DLPFC) and supplementary motor area (SMA), are differentially activated during lexical and semantic language tasks, we used functional magnetic resonance imaging in eight healthy right-handed subjects silently performing two semantic tasks (adjective and verb generation) and a lexical retrieval task (noun recall). Activation was observed in Broca’s area, DLPFC and SMA for all tasks. Broca’s area activation was approximately doubled during the semantic tasks compared with the lexical task (verbs vs nouns: 19.1 ± 4.5 vs 8.9 ± 1.6 voxels, p = 0.02; adjectives vs nouns 24.4 ± 7.5 vs 10.1 ± 2.8 voxels, p = 0.04); however, there were no significant differences in the DLFPC or SMA across tasks. We conclude that Broca’s area is more active during tasks that have a semantic content, whereas areas involved in preparatory processing (SMA) and memory retrieval (DLPFC) are engaged equally during both types of task.

Publication Type: Journal Article
Publisher: Churchill Livingstone
Copyright: © 2005 Elsevier Ltd
URI: http://researchrepository.murdoch.edu.au/id/eprint/25682
Item Control Page Item Control Page