表題番号:1998B-509 日付:2003/06/25
研究課題最適化原理に基づく到達運動計算論モデルによる失行症のシミュレーションとその神経生物学的制約条件充足の検討
研究者所属(当時) 資格 氏名
(代表者) 文学部 教授 福沢 一吉
研究成果概要
Wada and Kawato (1995) proposed a computational models on handwriting and reaching movement based on the minimum commanded torque change model where we plan an arm trajectory minimizing the time integral of the square of the rate of the commanded torque change. The object function of the minimum commanded torque change model is expressed as follows. The following two facts are mathematically deduced from the model.
(1) when movement distance is constant, the time integral of the square of the rate of the commanded torque change becomes larger as the motion duration becomes shorter.
(2) when movement distance is constant, the time integral of the square of the rate of the commanded torque change becomes smaller as the hand height becomes lower.
To confirm the theoretical assumptions of this mode, we measured arm movement on the sagittal plane of parietal lobe damaged patients and control subjects. In neurological patients, (1) the hand height did not become lower as the motion duration became shorter; (2) the hand jerk of measured trajectory increased when motion duration lengthened. These results suggested that the parietal lobe is involved with realizing smooth arm movement. The performance of patients with parietal lobe lesions may reflect their difficulties in planning a trajectory with smooth movement.