(2) 向きを表す記号・漢字イメージング時EEGによるマイクロロボット制御
山ノ井髙洋, 豊島恒, 江蔵充, 山﨑敏正, 菅野道夫
第４回脳と知能研究会, 4-1～4-4, 2008-2
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 of the subject 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. Further we sampled EEG data at latency from 400ms to 900ms at 25ms interval by the three channels in the right upper frontal gyrus. So the number of the variates is twenty one by three channels, therefore the sum is sixty three variates. Results of the discriminant analysis for four type objective variates were mostly more than 80 %. By four type code of infrared rays according to the discrimination results from a PC, the authors have controlled a micro robot the e-Puck.
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