Department of Psychology, Nottingham Trent University, Nottingham, UK.
Exp Brain Res. 2020 Apr;238(4):771-787. doi: 10.1007/s00221-020-05751-9. Epub 2020 Feb 27.
Recent research has shown that systematic postural adjustments occur during periods of manual motor imagery (MI), but the timing (anticipatory or reactive) and directionality (against or in the direction of arm extension) of these postural motions relative to individual manual actions or imagery are not well understood. This study analyzed the anteroposterior hip and head motion of healthy young and older participants, while they imagined bilateral arm raises under self-initiated or environmentally triggered performance conditions. When MI was self-initiated, both age groups showed significant forward postural motion during the second prior to MI initiation. When MI (or physical arm movement) was environmentally triggered, however, older people did not show anticipatory forward postural motion, but did show compensatory backward head motion. These results suggest that manual MI is indeed accompanied by anticipatory postural motion, but this anticipation is attenuated in older people when they do not have control over the timing of manual movement onset.
最近的研究表明，在手动运动想象（MI）期间会发生系统性姿势调整，但这些姿势运动的时间（预期或反应性）和方向（与手臂伸展方向相反或一致）相对于个体的手动动作或想象尚不清楚。本研究分析了健康的年轻和老年参与者在自我启动或环境触发的运动条件下想象双侧手臂抬起时的前后髋关节和头部运动。当 MI 是自我启动时，两个年龄组在 MI 启动前的第二秒都显示出明显的向前姿势运动。然而，当 MI（或实际手臂运动）是环境触发时，老年人没有表现出预期的向前姿势运动，但确实表现出补偿性的向后头部运动。这些结果表明，手动 MI 确实伴随着预期的姿势运动，但当老年人无法控制手动运动开始的时间时，这种预期会减弱。
