Buchanan John J, Ryu Young U
Department of Health and Kinesiology, Texas A&M University, College Station, TX 77843-4243, USA.
J Mot Behav. 2006 May;38(3):163-84. doi: 10.3200/JMBR.38.3.163-184.
The authors manipulated movement amplitude in a bimanual circle-tracing task to alter the natural tracing frequency of the arms. Participants (N = 14) traced different-diameter circles simultaneously with the two arms in either in-phase (0 degrees) or antiphase (180 degrees) coordination, using the index fingers or plastic styli. Movement amplitude altered the natural tracing frequency of the arms, as demonstrated by the following 2 findings: (a) The larger the difference in circle diameter, the larger was the shift from the fixed-point values of 0 degrees and 180 degrees, and the shift increased as movement frequency increased. Those results are consistent with the manipulation of delta omega in the bimanual pendulum paradigm. (b) Increasing movement frequency induced transitions from 1:1 to non-1:1 coordination, contrary to findings in previous investigations of polyrhythmic coordination. Tactile feedback played a minimal role in stabilizing bimanual coordination in the current tasks.
作者在双手画圈任务中操纵运动幅度，以改变手臂的自然画圈频率。参与者（N = 14）用食指或塑料笔同时用双臂以同相（0度）或反相（180度）协调方式画不同直径的圈。运动幅度改变了手臂的自然画圈频率，如下两个发现证明了这一点：（a）圈直径差异越大，从0度和180度的定点值的偏移就越大，并且该偏移随着运动频率的增加而增加。这些结果与双手摆范式中对Δω的操纵一致。（b）与先前对多节奏协调的研究结果相反，增加运动频率会导致从1:1协调转变为非1:1协调。在当前任务中，触觉反馈在稳定双手协调方面作用极小。
