Walter C B, Swinnen S P
Department of Physical Education, University of Illinois, Chicago 60680.
Brain Cogn. 1990 Nov;14(2):185-200. doi: 10.1016/0278-2626(90)90028-m.
The control of a dynamic bimanual task was examined by manipulating two independent factors that potentially influence interlimb interference. Subjects attempted to perform a unidirectional movement with either their preferred or nonpreferred arm while concurrently producing a sequential movement with the contralateral arm. The magnitude of force required to produce the more complex, sequential action was manipulated in addition to the arm with which it was performed. The degree of interlimb interference was determined through an analysis of limb kinematics. A clear performance asymmetry was noted, with greater interference evident when the sequential action was generated by the nonpreferred left arm than by the preferred right arm. The level of force needed to produce the sequential movement also directly influenced interlimb interference, but this effect was bilaterally symmetrical. The findings are generally consistent with a hierarchical view of movement organization comprising lateralized hemispheric specialization for the organization of time-domain characteristics of sequential actions, followed by nonlateralized metrical scaling of force parameters. Implications of the findings for "dynamical" descriptions of bimanual actions are also discussed.
通过操纵两个可能影响双侧肢体干扰的独立因素，对动态双手任务的控制进行了研究。受试者试图用其优势臂或非优势臂进行单向运动，同时用对侧手臂进行连续运动。除了执行连续动作的手臂外，还操纵了产生更复杂连续动作所需的力的大小。通过对肢体运动学的分析来确定双侧肢体干扰的程度。观察到明显的表现不对称，当由非优势左臂产生连续动作时，比由优势右臂产生时，干扰更明显。产生连续运动所需的力的水平也直接影响双侧肢体干扰，但这种影响是双侧对称的。这些发现总体上与运动组织的层次观点一致，该观点包括用于组织连续动作时域特征的侧化半球特化，随后是力参数的非侧化度量缩放。还讨论了这些发现对双手动作“动力学”描述的意义。
