(13) SPATIOTEMPORAL BRAIN ACTIVITIES DURING HIRAGANA RECOGNITION TASK
Hisashi Toyoshima, Takahiro Yamanoi, Toshimasa Yamazaki, Shin-ichi Ohnishi
北海学園大学大学院工学研究科紀要工学研究, 第10号, pp.51-55, 2010-9
The authors recorded nineteen-channel event related potentials (ERPs) during recognition of Japanese characters; Hiragana (one type of phonetic characters). By field-sequential stereoscopic 3D display with liquid crystal shutters, a real word and a non-word were simultaneously and independently presented to the left (right) and the right (left) eyes, respectively. Each word consists of three Hiragana characters. Three subjects were instructed to press a button 3000 ms post stimulus when they understood the meaning of the visual stimulus. Equivalent current dipole source localization (ECDL) with three unconstrained ECD was applied to the ERPs. The ECDs were localized to the Wernicke's area at around 600 ms. The ECD for one left-handed subject was localized at the Wernicke's homologue. After that ECDs were localized to the prefrontal area, the superior frontal gyrus and the middle frontal gyrus. Then at around 800 ms, the ECDs were localized to the Broca's area and after that ECDs were localized again to the Wernicke's area and then to Broca's area.
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