Matsuda Naoyoshi, Abe Masaki O
Graduate School of Education, Hokkaido University, Sapporo 060-0811, Japan.
Faculty of Education, Hokkaido University, Sapporo 060-0811, Japan.
Biology (Basel). 2023 Mar 3;12(3):404. doi: 10.3390/biology12030404.
Previous studies have demonstrated the effects of motor variability on motor adaptation. However, their findings have been inconsistent, suggesting that various factors affect the relationship between motor variability and adaptation. This study focused on the size of errors driving motor adaptation as one of the factors and examined the relationship between different error sizes. Thirty-one healthy young adults participated in a visuomotor task in which they made fast-reaching movements toward a target. Motor variability was measured in the baseline phase when a veridical feedback cursor was presented. In the adaptation phase, the feedback cursor was sometimes not reflected in the hand position and deviated from the target by 0°, 3°, 6°, or 12° counterclockwise or clockwise (i.e., error-clamp feedback). Movements during trials following trials with error-clamp feedback were measured to quantify implicit adaptation. Implicit adaptation was driven by errors presented through error-clamp feedback. Moreover, motor variability significantly correlated with implicit adaptation driven by a 12° error. The results suggested that motor variability accelerates implicit adaptation when a larger error occurs. As such a trend was not observed when smaller errors occurred, the relationship between motor variability and motor adaptation might have been affected by the error size driving implicit adaptation.
先前的研究已经证明了运动变异性对运动适应的影响。然而，他们的研究结果并不一致，这表明各种因素会影响运动变异性与适应之间的关系。本研究将驱动运动适应的误差大小作为其中一个因素进行重点关注，并考察了不同误差大小之间的关系。31名健康的年轻成年人参与了一项视觉运动任务，他们朝着一个目标进行快速伸手动作。在呈现真实反馈光标时的基线阶段测量运动变异性。在适应阶段，反馈光标有时不反映在手部位置，并逆时针或顺时针偏离目标0°、3°、6°或12°（即误差钳制反馈）。测量误差钳制反馈试验后的试验过程中的动作，以量化内隐适应。内隐适应由误差钳制反馈呈现的误差驱动。此外，运动变异性与由12°误差驱动的内隐适应显著相关。结果表明，当出现较大误差时，运动变异性会加速内隐适应。由于在出现较小误差时未观察到这种趋势，运动变异性与运动适应之间的关系可能受到驱动内隐适应的误差大小的影响。
