Normalized N100m Latency of the Auditory Evoked Fields After Surgical Removal of Temporal Lobe Gliomas
Auditory evoked potentials have been measured in patients with several temporal lobe diseases. The N100 responses disappear in patients with lesions on bilateral superior temporal gyrus. However, separation of a unilateral abnormality in evoked potentials, is difficult due to the spearing effect by tissue layers with inhomogeneous electric conductivities. Activity on the normal hemisphere may interfere with abnormal activity on the diseased hemisphere. Magnetoencephalography (MEG) is known to be less influenced by the inhomogeneous head conductivity. We have found that the whole head MEG is especially suitable to identify differences in bilateral cerebral function [2–4].
KeywordsTemporal Lobe Cystic Tumor Left Temporal Lobe Ipsilateral Response Dipole Position
Unable to display preview. Download preview PDF.
- Nakasato, N., Fujita, S., Seki K., Kawamura T., Matani, A., Tamura, I., Fujiwara, S., and Yoshimoto, T. Functional localization of bilateral auditory cortices using an MRI-linked whole head magnetoencephalography (MEG) system. Electroencephalography and Clinical Neurophysiology, 1995, 94: 183–190.CrossRefGoogle Scholar
- Nakasato, N., Fujita, S., Matani, A., Tamura, I., Fujiwara, S., and Yoshimoto, T. Clinical application of the whole head MEG: Auditory evoked response in patients with intracranial structural lesions. In: Baumgartner, C., Deecke, L., Stroink, G., and Williamson, S.J. Biomagnetism: Fundamental Research and Clinical Applications, Amsterdam, Elsevier/IOS Press, 1995, pp 186–190.Google Scholar
- Kanno, A., Nakasato, N., Fujita, S., Seki, K., Kawamura, T., Ohtomo, S., Fujiwara, S., and Yoshimoto, T. Right hemispheric dominance in the auditory evoked magnetic fields for pure-tone stimuli. Electroencephalography and Clinical Neurophysiology, in press.Google Scholar