著者

東郷 俊太 香川 高弘 宇野 洋二

出版者

一般社団法人電子情報通信学会

雑誌

電子情報通信学会技術研究報告 : 信学技報 (ISSN:09135685)

巻号頁・発行日

vol.112, no.480, pp.173-178, 2013-03-13

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本研究では,人間が一次元の手先の目標軌道を追従する,一次元軌道追従タスクを行う動作を計測し,解析を行った.このタスクにおいて,追従方向と直交する方向はタスクの達成とは関係の無い方向である.計測結果として,終端姿勢において被験者の手先はタスク達成と関係の無い方向に大きくばらついた.また,接線速度の概形はベル型であり,小さなピークが多く含まれていた.UCM解析を用いて関節間協調を定量的に評価した結果,タスクの達成に影響を与えないばらつきが時間と共に増加した.これらの運動学的な特徴や関節間協調の特徴は,我々が提案したUCM参照フィードバック制御法によってよく再現された.UCM参照フィードバック制御法は,時々刻々と目標UCM空間を生成し,UCM空間上から最適な一点を選び続ける制御方策である.これらの結果は,人間はUCM空間を参照することによって,タスク達成に関係の無いばらつきを許容しながら,多関節を協調的に制御していることを示唆している.また,人間の視覚運動制御系においてUCM空間の神経表現が存在している可能性があることを示唆している.In this paper, we measured and analyzed a one-dimensional target tracking task in which human subjects tracked one-dimensional target trajectory of the hand. In this task, the direction orthogonal to the movement direction is task-irrelevant. As a result, the hand position at the movement end was more varied in the task-irrelevant direction. Moreover, the profile of tangential hand velocity was roughly bell-shaped but they also had small peaks. Results of UCM analysis which is used to quantify the joint coordination showed that the task-irrelevant variance increased with time. These characteristics of kinematics and joint coordination were well reproduced by our UCM reference feedback control. UCM reference feedback control generates a target UCM space each time step and selects one point in UCM space. These results suggest that the human refers to UCM space step by step to control a multi-joint arm allowing the task-irrelevant variability. Moreover, it is suggested that the human would represent UCM space in visuomotor control system.

著者

香川 高弘 宇野 洋二 神谷 俊光 河村 耕造

出版者

公益社団法人 計測自動制御学会

雑誌

計測自動制御学会論文集 (ISSN:04534654)

巻号頁・発行日

vol.44, no.11, pp.886-895, 2008-11-30 (Released:2013-02-25)

参考文献数

26

被引用文献数

1 1

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A legged locomotor device for paraplegics have been attempted to improve their ADL (Activity of Daily living) and to prevent some complications. A stride control of the system based on the user's intension is important to coordinate the voluntary movements of the user and the assisted movements of the paralyzed legs. In this paper, we propose a human interface with a walker to control the stride length of a legged locomotor device. Assuming that an intended stride is equal to a distance of the preceding movement of the walker, we developed a human interface estimating the movement distance of the walker, where the distance is calculated by polynomial fitting for the acceleration of the movement. In order to evaluate the performance of the proposed human interface, we carried out the experiments for simultaneous measurements of the distance of the walker and the acceleration signal. In this paper, we report the following results;(1) consistency of a stride length and the preceding movement distance of the walker,(2) estimation accuracy by polynomial fitting method, and (3) feasibility of the adjustment of stride length using the proposed method. These results suggest that the proposed human interface is effective to adjust the stride length of a legged locomotor device.