Abstract
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[1]. 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].
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Woods, D.L., Clayworth, C.C., Knight, R.T., Simpson, G.V., and Naeser, M.A. Generators of middle and long-latency auditory evoked potentials: implications from studies of patients with bitemporal lesions. Electroencephalography and Clinical Neurophysiology, 1987, 68: 132–148.
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.
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.
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.
Mäkelä. J.P. Auditory evoked magnetic fields in stroke. Physiological Measurement, 1993, 14: 51–54.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2000 Springer Science+Business Media New York
About this paper
Cite this paper
Kanno, A. et al. (2000). Normalized N100m Latency of the Auditory Evoked Fields After Surgical Removal of Temporal Lobe Gliomas. In: Aine, C.J., Stroink, G., Wood, C.C., Okada, Y., Swithenby, S.J. (eds) Biomag 96. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-1260-7_248
Download citation
DOI: https://doi.org/10.1007/978-1-4612-1260-7_248
Publisher Name: Springer, New York, NY
Print ISBN: 978-1-4612-7066-9
Online ISBN: 978-1-4612-1260-7
eBook Packages: Springer Book Archive