Ridderikhoff Arne, Peper C Lieke E, Beek Peter J
Institute for Fundamental and Clinical Human Movement Sciences, IFKB, Faculty of Human Movement Sciences, Vrije Universiteit, Van der Boechorststraat 9, 1081 BT Amsterdam, The Netherlands.
Neurosci Lett. 2006 May 15;399(1-2):71-5. doi: 10.1016/j.neulet.2006.01.026. Epub 2006 Feb 9.
This study examined if and how phase entrainment by movement-related afference-- induced by passive movements of the contralateral hand-- contributes to the coordinative stability of rhythmic bimanual movements. The results revealed that phase-shifted passive movements of the dominant or the nondominant hand induced similar entrainment effects on the active movements of the contralateral hand. In terms of the phase relations between the hands only two attractors of equal strength were present, corresponding to relative phase shifts of 0 degrees and 180 degrees , respectively, i.e., to in-phase and antiphase coordination. The attractors were separated by two repellors located at relative phase shifts of +90 degrees and -90 degrees . EMG analysis indicated that the entrainment effects indeed resulted from contralateral afference, because no related changes in muscle activation were observed in the passively moved hand. It was concluded that phase entrainment by contralateral afference contributed equally to the stable performance of the bimanual in-phase and antiphase patterns, thereby enhancing the stability of these patterns relative to other phase relations between the limbs.
本研究探讨了由对侧手部被动运动所引发的与运动相关的传入信息的相位同步，是否以及如何对有节奏的双手运动的协调稳定性产生影响。结果显示，优势手或非优势手的相位偏移被动运动，对另一侧手部的主动运动产生了相似的同步效应。就双手之间的相位关系而言，仅存在两个强度相等的吸引子，分别对应于0度和180度的相对相位偏移，即同相和反相协调。吸引子被位于+90度和 -90度相对相位偏移处的两个排斥子分隔开。肌电图分析表明，同步效应确实源于对侧传入信息，因为在被动运动的手部未观察到肌肉激活的相关变化。研究得出结论，对侧传入信息的相位同步对双手同相和反相模式的稳定表现具有同等贡献，从而相对于肢体之间的其他相位关系增强了这些模式的稳定性。
