Meesen R L J, Wenderoth N, Temprado J J, Swinnen S P
Motor Control Laboratory, Research Center for Motor Control and Neuroplasticity, Department of Biomedical Kinesiology, K.U.L., Tervuurse Vest 101, 3001 Leuven, Belgium.
Behav Brain Res. 2008 Mar 5;187(2):361-70. doi: 10.1016/j.bbr.2007.09.030. Epub 2007 Oct 4.
The role of directional compatibility was investigated during the production of in-phase and anti-phase coordination patterns involving both arms as well as the head. Our first aim was to compare the quality of coordination between both arms when symmetrical arm posture manipulations were used to disentangle muscle homology from the mutual direction of limb motions in extrinsic space. Findings revealed that in-phase coordination, characterized by the simultaneous activation of homologous muscle groups, was resistant to posture manipulations. Conversely, during anti-phase coordination, the influence of extrinsic direction became more prevalent whereby isodirectionality in extrinsic space contributed to stabilization of anti-phase coordination patterns. The second aim was to study the effect of periodic head movements upon the assembling of a coordinative synergy among the body segments. The findings demonstrated that the in-phase patterns were hardly affected by directionality of head motion. Conversely, the anti-phase patterns were more vulnerable to the directional influence of head movements, showing less accurate and stable coordination during non-isodirectional than isodirectional head motions. These observations underscore the robust nature of coordination patterns based on muscle homology, even in the absence of symmetric arm positions. Moreover, isodirectional head movements became easily integrated with the overall coordination pattern, whereas head-limb coupling was poor when the head moved anti-directional with the limbs.
在涉及双臂以及头部的同相和反相协调模式产生过程中，研究了方向兼容性的作用。我们的首要目标是，当使用对称手臂姿势操作来区分肌肉同源性与外在空间中肢体运动的相互方向时，比较双臂之间的协调质量。研究结果显示，以同源肌肉群同时激活为特征的同相协调对姿势操作具有抗性。相反，在反相协调过程中，外在方向的影响更为普遍，外在空间中的同向性有助于反相协调模式的稳定。第二个目标是研究周期性头部运动对身体各节段间协调协同作用组装的影响。研究结果表明，同相模式几乎不受头部运动方向性的影响。相反，反相模式更容易受到头部运动方向影响，在头部非同向运动时比同向运动时表现出不太精确和稳定的协调。这些观察结果强调了基于肌肉同源性的协调模式的稳健性，即使在没有对称手臂位置的情况下也是如此。此外，同向头部运动很容易与整体协调模式整合，而当头部与肢体反向运动时，头-肢耦合较差。
