University of Wyoming, Laramie, WY, United States.
Indiana University, Bloomington, IN, United States.
Hum Mov Sci. 2021 Oct;79:102855. doi: 10.1016/j.humov.2021.102855. Epub 2021 Aug 10.
Two groups of participants were trained to be proficient at performing bimanual 90° coordination either at a high (2.5 Hz) or low (0.5 Hz) frequency with both kinesthetic and visual information available. At high frequency, participants trained for twice as long to achieve performance comparable to participants training at low frequency. Participants were then paired within (low-low or high-high) or between (low-high) frequency groups to perform a visually coupled dyadic unimanual 90° coordination task, during which they were free to settle at any jointly determined frequency to synchronize their rhythmic movements. The results showed that the coordination skill was frequency-specific. For dyads with one or both members who had learned the 90° bimanual coordination at low frequency, the performance settled at a low frequency (≈0.5 Hz) with more successfully synchronized trials. For dyads with both members who had learned the 90° bimanual coordination at high frequency, they struggled with the task and performed poorly. The dyadic coordination settled at a higher frequency (≈1.5 Hz) on average, but with twice the variability in settling frequency and significantly fewer synchronized trials. The difference between the dyadic coordination and bimanual tasks was that only visual information was available to couple the movements in the former while both kinesthetic and visual information were available in the latter. Therefore, the high frequency group must have relied on kinesthetic information to perform both coordination tasks while the low frequency group was well able to use visual information for both. In the mixed training pairs, the low frequency trained member of the pair was likely responsible for the better performance. These conclusions were consistent with results of previous studies.
两组参与者接受了训练，以熟练掌握双手 90°协调，分别在高（2.5 Hz）或低（0.5 Hz）频率下进行，同时提供动觉和视觉信息。在高频下，参与者需要训练两倍的时间才能达到与低频训练参与者相当的表现。然后，参与者在（低-低或高-高）或（低-高）频率组内配对，执行视觉耦合的单手双 90°协调任务，在此期间，他们可以自由选择任何共同确定的频率来同步他们的节奏运动。结果表明，协调技能具有频率特异性。对于一对参与者中的一个或两个成员在低频下学习了 90°双手协调的情况，协调技能在低频（≈0.5 Hz）下表现出色，且更成功地同步了试验。对于一对成员在高频下学习了 90°双手协调的情况，他们在任务中遇到了困难，表现不佳。双协调平均稳定在较高的频率（≈1.5 Hz），但在稳定频率的变异性方面增加了两倍，且同步试验的数量明显减少。双协调与双手任务的区别在于，前者仅通过视觉信息来耦合运动，而后者同时提供动觉和视觉信息。因此，高频组必须依赖动觉信息来执行这两种协调任务，而低频组则能够很好地使用视觉信息来执行这两种任务。在混合训练的配对中，配对中的低频训练成员可能负责更好的表现。这些结论与之前的研究结果一致。
