Auditory evoked magnetic fields in cases with temporal lobe glioma Akitaka KANNO 1 , Nobukazu NAKASATO 2 , Kazuo MIZOI 2 , Takashi YOSHIMOTO 2 1MEG Laboratory, Kohnan Hospital 2Department of Neurosurgrey, Tohoku University School of Medicine Keyword: magnetoencephalography(MEG) , auditory evoked response , glioma , temporal lobe pp.921-925
Published Date 1996/10/10
DOI https://doi.org/10.11477/mf.1436901284
  • Abstract
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Auditory evoked magnetic field (AEF) is known to be suitable to separate left and right hemispheric activi-ties while auditory evoked potential is not. To evaluate cortical auditory function in ten patients with temporal lobe gliomas, we measured AEF for monaural tone sti-muli using a helmet-shaped 66-channel MEG system. Latency of the N100m, the most prominent peak with a latency around 90 ms, was measured in the hemisphere contralateral to the stimulus onset. In five patients, the N100m latency was within our normal range (mean±2 s.d.). In these five cases, tumor was located in the anterior or the inferior part of the temporal lobe. We observed significant delay of the N100m latency in fourpatients and disappearance of the N100m in another pa-tient. In the later five patients, tumor extended to the superior and posterior part of the temporal lobe. AEFcan be used to evaluate cortical auditory function noninvasively in cases with temporal lobe gliomas.

Copyright © 1996, Igaku-Shoin Ltd. All rights reserved.


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