Dynamic brain responses to semantic incongruencies in the visually presented language streams

Abstract

Event Abstract Back to Event Dynamic brain responses to semantic incongruencies in the visually presented language streams Kouichi Sutani1* and Sunao Iwaki1 1 National Institute of Advanced Industrial Science and Technology, Japan Semantically inappropriate words embedded in a sentence elicits event related potential (ERP) component called N400 at the latencies around 400 ms after the stimulus onset. Although considerable research has been conducted to examine the neural mechanisms underlying the generation of the N400 component, the neural dynamics involved in the generation of the component has yet to be fully identified. In the present study, a whole-head MEG system was used to investigate neuromagnetic responses during the recognition of semantic incongruencies in visually-presented language streams in normal adult subjects. The test sentences, which consisted of 6 phrases, were presented visually one by one, and subjects were asked to judge the semantic validity of the last phrase. The MEG data were analyzed using both the exploratory dipole estimation and the linearly-constrained minimum-variance (LCMV) spatial filtering technique to visualize spatio-temporal neural dynamics related to the generation of N400 component. Activities in the left superior-temporal gyrus, the left angular gyrus, and the left temporal pole were observed in the dipole estimation, and the LCMV spatial filter detected activities in inferior frontal gyrus as well. The current results indicate that the working memory as well as the language-specific processes was involved in the generation of the N400 component. Conference: Biomag 2010 - 17th International Conference on Biomagnetism , Dubrovnik, Croatia, 28 Mar - 1 Apr, 2010. Presentation Type: Poster Presentation Topic: Language Citation: Sutani K and Iwaki S (2010). Dynamic brain responses to semantic incongruencies in the visually presented language streams. Front. Neurosci. Conference Abstract: Biomag 2010 - 17th International Conference on Biomagnetism . doi: 10.3389/conf.fnins.2010.06.00269 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 01 Apr 2010; Published Online: 01 Apr 2010. * Correspondence: Kouichi Sutani, National Institute of Advanced Industrial Science and Technology, Osaka, Japan, k-sutani@aist.go.jp Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Kouichi Sutani Sunao Iwaki Google Kouichi Sutani Sunao Iwaki Google Scholar Kouichi Sutani Sunao Iwaki PubMed Kouichi Sutani Sunao Iwaki Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.