Study on the Auditory Area Function of Right and Left Hemispheres in Man

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  • 脳磁図を用いた左右脳半球の機能分析に関する研究

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Purpose: To investigate differences in auditory activity, the auditory areas in the right and left hemisphere were measured and analyzed using magnetoencephalography (MEG). And the interaction between auditory area response and handedness, speech area was examined. Subject and method: We examined healthy adult 44 subjects with normal hearing who were right-handed (29) and left-handed (15 subjects). The speech area was also examined in 29 subjects who were right-handed (19) and left-handed (10). For the measurement of the auditory activity, the stimuli ware 1kHz tone burst by the two ways of right and left ear stimulation. For the comparison of the hemisphere differences in right and left, the wave of N100m amplitude was applied. The equivalent current dipole was detected in order to quantify analysis. We verified statistically the relation with speech area and handedness. The dominant hemisphere in speech area was also identified using method of identification with memory task of language. Results: We could find clear responses N100m peaks in 42 of 44 subjects, and they could se classified into three groups: the contra-lateral dominant type, right hemisphere dominant type and left hemisphere dominant type. It was revealed that patterns of auditory area activity were related to handedness. It was proved that subjects of right hemisphere dominant type in the speech area were dominant in left hemisphere concerning auditory area activity Conclusion: By using MEG, we could measure auditory area in right and left hemispheres simultaneously and it was revealed three types of responses. One of the reasons for the difference in hemispheric activity was surmised to be the relation between the handedness and the localization of the speech area. It has a great opportunity to apply decision for cochlear implant and hearing aid clinically.

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