(9) 右上前頭回からの脳波出力を用いたブレイン・マシン・インターフェイスの基礎研究
山ノ井髙洋，豊島 恒，大西真一，山崎敏正，菅野道夫
工学研究（北海学園大学大学院工学研究科紀要）, 第7号, pp.43-47, 2007-9
To develop a brain machine interface the authors have investigated the brain activity during human recognition of characters and symbols representing directional meaning. The authors have recorded electroencephalograms (EEGs) from subjects in viewing four types of Kanji (Chinese characters being used currently in the Japanese language) and arrows presented on the CRT. Each of four characters or symbols means direction of upward, downward, leftward and rightward, respectively. Subjects were asked to make read the stimulus silently. Regardless of the directions, the reaction time was almost equal, when character or arrow was presented. EEGs were averaged in each stimulus type and direction, and event related potentials (ERPs) were obtained. The equivalent current dipole source localization (ECDL) method had been applied to these ERPs. With arrow symbols, ECDs had been localized to areas related to the shape recognition, such as the right inferior or the right middle temporal gyrus. In both cases, ECDs were localized to areas related to working memory for the spatial perception. Taking account of these facts, the authors investigated a single trial EEGs precisely after the latency at 400ms, and determined effective sampling latencies for the discriminant analysis to four types of arrow: ↑, ↓, ← and →. By the discriminant analysis, the results of discriminant rate are 100% in each subject and in each trial. These results show a possibility of use of EEGs for a brain machine interface in four type controls.
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