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Proceedings Paper

Neuromagnetic fields and language: the problem of source localization
Author(s): Jackson Alan Beatty; Russell A. Johnson
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Paper Abstract

Human thought and language has its biological substrate in the neural machineiy of the cerebral cortex. The cerebral hemispheres are composed of approximately one hundred separate regions that perform specialized information processing functions. When activated, synchronized electrical currents in these regions can produce magnetic fields that are measureable from the surface of the scalp, a procedure known as magnetoencephalography (MEG). To study the physiology of language perception, we have recorded MEG evoked by auditorily presented phonemic and nonphonemic stimuli. Problems arise in interpreting such data, as multiple spatially-distributed cortical generators probably contribute to the measured magnetic fiekL Two approaches may be taken to resolving this problem: principal components analysis of temporally separated fields and residual field analysis. Both approaches require experimental verification before they can be applied widely. Despite this limitation, MEG data are already capable of detecting abnormalities of cortical language localization, as ifiustrated in a case of displaced language cortex resulting from an arteriovenous malformation.

Paper Details

Date Published: 1 November 1990
PDF: 8 pages
Proc. SPIE 1351, Digital Image Synthesis and Inverse Optics, (1 November 1990); doi: 10.1117/12.23651
Show Author Affiliations
Jackson Alan Beatty, Univ. of California/Los Angeles (United States)
Russell A. Johnson, Univ. of California/Los Angeles (United States)

Published in SPIE Proceedings Vol. 1351:
Digital Image Synthesis and Inverse Optics
Arthur F. Gmitro; Paul S. Idell; Ivan J. LaHaie, Editor(s)

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