Study of Human's Motor Control Model Using 2 Degree of Freedom Target Tracing

摘要

This study aims to verify the acquisition of internal model on periodic wrist joint rotating movement and its characteristics. The phase difference between the target and the tracer, and TCL (Total Co-contraction Level) which represents the wrist joint stiffness were measured both when there was a visual feedback and there was no visual feedback varying the target speed-0.1 Hz, 0.3 Hz, 0.5 Hz. When there was visual information of the target, the stiffness of the wrist joint increased in proportion to the target speed, which is also the movement difficulty. In the meantime, it was observed that the frequency in the precedence of the tracer increased with the target speed of 0.3 Hz and 0.5 Hz compared to the 0.1 Hz, which shows the active use of the internal model. Also it was shown that even though there was an increase in the phase error, the movement was performed using the internal model with steady speed when the visual information is blocked. These show that the internal model on periodic movement speed is acquired and the joint stiffness actively works as motor command when the movement difficulty increases.