A trial to elucidate neural mechanism of language information processing in perceptual executive system.

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This time we attempted to explore the relation of cognition and word expression in neural perceptual executive system. Healthy right handed 4 normal volunteer (man 2, woman 2) were participated to this study. The magnetic fields while performing capping verses (called "SHIR1TORI" in Japanese) were measured by using magnetoencephalography (MEG). Responses of control session (passive hearing of tone or viewing of flash stimuli, which were used as cue stimuli in the paradigm session) and paradigm session (mental generation of words one by one according to "SHIRITORI" manner immediately after each cue stimulus emission) were recorded, then analyzed after off-line averaging. Root mean square (RMS) of averaged magnetic fields in the paradigm session delineated its increase at some latencies as compared with control one, which latencies after flash and tone stimulus onset ranged from 380msec to 930msec and 300msec to 820msec, respectively. In addition, estimated dipoles of these latencies were located to some language-related area of left hemisphere reported conventional PET and fMRI studies, including frontal operculum, fusiform and posteroinferor temporal region.