脳磁図(MEG)の聴覚研究への応用-文献的考察を中心に-

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Magnetoencephalogram (MEG) is a noninvasive technique for the evaluation of cerebral cortical function. Neuromagnetic fields are very weak and detected with devices called neuromagnetometers. When a magnetic field links the coils in the dewar of the neuromagnetometer, an electrical current is generated. The current is directed toward a very sensitive detector called a superconducting quantum interference device (SQUID).This paper reviews the literature on the auditory evoked field (AEF). Investigators have demonstrated tonotopicity, amplitopicity, and periodicity pitch representation in the auditory cortex. Differences of AEF between vowel and consonant-vowel have been reported in Finnish and Japanese. AEF was measured in patients with tinnitus and in patients during auditory hallucinations.MEG is better than evoked potential in the estimation of auditory evoked response in the cerebral cortex.
耳鼻咽喉科臨床学会の論文
1995-09-01