Motor control hierarchy in joint action that involves bimanual force production
Motor control hierarchy in joint action that involves bimanual force production
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DOI：
10.1152/jn.00313.2015
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发表时间：
2015-06-01
影响因子：
2.5
通讯作者：
Inui, Nobuyuki
中科院分区：
文献类型：
--
作者：
Masumoto, Junya;Inui, Nobuyuki
分层电机控制的概念已被视为逐渐减少每个较高控制级别操纵的变量数量的方法。我们测试了这样的假设：将个体双手力产生任务转变为联合（两个参与者）力产生任务将导致个体参与者两只手产生的力之间存在正相关（对称策略），从而使两个参与者产生的力之间存在负相关（互补策略）。本研究包括涉及单手和双手条件的个人和联合任务。在联合任务中，10 对参与者产生周期性等长力，使得他们产生的力的总和与 1 Hz 最大自主收缩的 5% 到 10% 之间循环的目标力相匹配。在个人任务中，个人试图匹配相同的目标力量。在联合双手条件下，每个参与者的两只手采取对称的用力策略，而两个参与者采取互补的用力策略，强调双手动作表现为层次结构的低层，而联合动作表现为层次结构的上层。人与人之间产生的互补力比人与人之间产生的互补力更大。然而，虽然在所有条件下 1 Hz 时的相干性最高，但个人内部的频率同步性比人际间的频率同步性更强。此外，虽然双手动作比单手动作表现出更小的误差和力的变化，但联合动作比单独动作表现出更小的变化间隔和力量。
The concept of hierarchical motor control has been viewed as a means of progressively decreasing the number of variables manipulated by each higher control level. We tested the hypothesis that turning an individual bimanual force-production task into a joint (two-participant) force-production task would lead to positive correlation between forces produced by the two hands of the individual participant (symmetric strategy) to enable negative correlation between forces produced by two participants (complementary strategy). The present study consisted of individual and joint tasks that involved both unimanual and bimanual conditions. In the joint task, 10 pairs of participants produced periodic isometric forces, such that the sum of forces that they produced matched a target force cycling between 5% and 10% of maximum voluntary contraction at 1 Hz. In the individual task, individuals attempted to match the same target force. In the joint bimanual condition, the two hands of each participant adopted a symmetric strategy of force, whereas the two participants adopted a complementary strategy of force, highlighting that the bimanual action behaved as a low level of a hierarchy, whereas the joint action behaved as an upper level. The complementary force production was greater interpersonally than intrapersonally. However, whereas the coherence was highest at 1 Hz in all conditions, the frequency synchrony was stronger intrapersonally than interpersonally. Moreover, whereas the bimanual action exhibited a smaller error and variability of force than the unimanual action, the joint action exhibited a less-variable interval and force than the individual action.