運動熟練者における運動関連脳電位の脳内発源部位の特徴

―ダイポール推定法による分析―

抄録

  The readiness latency for the movement in athletes was shorter than in non-athletes (Kita et al., 2001). The purpose of this study was to compare the differences of the source location of athlete’s MRCPs with those of the same aged subject’s MRCPs (non-athletes) using the EEG-dipole localization method. The athletes who participated in this study were kendoists and gymnasts. They are top rank athletes in Japan. They use their wrist extensively in daily training. The task was a right wrist extension. EEGs were recorded from 19ch on the scalp according to the international 10-20 system, and averaged during the period from 2.0 sec before to 0.5 sec after the EMG onset. The MRCPs of each subject was grand-averaged for each group. The MRCPs of each group were analyzed by the equivalent current dipole localization, respectively. As a result, in the non-athletes, the dipoles of MRCPs were localized on the prefrontal cortex, and then the movement-related cortical areas (CMA, PM, SMA and MIcx).In the other and, in the athletes, the dipoles were not localized on the movement-related cortical areas except MIcx. These results suggest that, in the athletes, the neural network of the brain becomes short circuit through the training required quick motion changes of the wrist, and the localized areas were more specific than in the non-athletes. In both groups, the dipoles were localized in the prefrontal cortex prior to those movement-related cortical areas. It is likely that the localization is represented a signal to start up action.