視覚言語課題遂行に伴う脳磁界信号の時間-周波数解析

概要

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We measured the MEG signals from seven normal, right-handed Japanese subjects during visual categorization tasks for word stimuli, and analyzed 5-15 Hz frequency components using time-frequency analysis. The power spectra normalized by mean powers during 0.5s before the onset of stimulation, indicated attenuations in the temporal and parietal regions of both hemispheres and in the occipital region at a latency of 0.5s and later. The attenuation in the right parietal region was due to left finger movement in response to the task, and the attenuation in the left temporal region was related to categorization and response. These results indicate that the neuromagnetic activities that the time-domain analysis cannot visualize from the event-related responses are observed using time-frequency analysis.
社団法人日本生体医工学会の論文
2006-12-10