The authors examined how the stability of the current total isometric force (F_T) produced by four fingers is influenced by previous and expected voluntary changes in F_T. The authors employed the synergy index obtained from the across-trial uncontrolled manifold analysis to quantify the stability of F_T. The authors compared two tasks with similar histories of F_T changes; one in which participants expected changes in F_T in the future, and one in which they expected no changes in F_T. The stability of F_T was lower in the former task, indicating the existence of a novel type of anticipatory synergy adjustment. Disparate histories of F_T changes yield inconsistent changes in stability, driven by individual differences in the covariation in the finger forces that leave F_T invariant. Future research should focus on exploring these individual differences to better understand how previous and expected behavior changes influence the stability of the current motor behavior.

作者研究了如何在当前的总等长收缩力（的稳定性˚F_牛逼由四根手指生产）由以前的和预期的自愿性变化的影响˚F_牛逼。作者采用了从跨试验的非受控流形分析获得的协同指数来量化F _T的稳定性。作者比较了两个具有类似F _T变化历史的任务。在其中的参与者预期的变化˚F_牛逼的未来，他们预计在没有变化，一个˚F_牛逼。F _T的稳定性在前一项任务中处于较低水平，表明存在一种新型的预期协同调整。F _T变化的不同历史记录会导致稳定性产生不一致的变化，这是由手指力的协变个体差异引起的，从而使F _T保持不变。未来的研究应集中于探索这些个体差异，以更好地了解先前和预期的行为变化如何影响当前运动行为的稳定性。