Abstract

We investigated the patterns of coordination between the left and right legs that support the task of maintaining an upright standing posture. We used cross-wavelet analyses to assess coordination between the centers of pressure under the left and right feet. We recruited participants with a lateralized functional preference for their right leg, and we manipulated whether these participants stood with symmetric/asymmetric stances and whether their eyes were open or closed. Our hypotheses were derived from the Haken-Kelso-Bunz (HKB) model of interlimb coordination dynamics. Consistent with HKB model predictions, we observed (1) coordination taking the form of metastable, transient epochs of stable phase relations, (2) preferences for in-phase and anti-phase coordination patterns, and (3) changes in pattern stability and phase leads associated with both stance asymmetry and right-side lateral preference. The form and stability of observed coordination patterns were mediated by the availability of visual information. Our findings confirm the existence of a metastable coordination dynamic associated with the task of maintaining upright stance. We discuss the implications of these findings in the context of evaluating the utility of the HKB model for understanding the functional organization of the posture system.

摘要

我们研究了支持维持直立站立姿势任务的左右腿之间的协调模式。我们使用交叉小波分析来评估左脚和右脚下压力中心之间的协调性。我们招募了对他们的右腿偏向功能性偏向的参与者，并且我们操纵了这些参与者是否以对称/不对称的姿势站立以及他们的眼睛是睁开还是闭着。我们的假设是从Haken-Kelso-Bunz（HKB）的协调动力学模型得出的。与HKB模型的预测相一致，我们观察到（1）采取具有稳定相位关系的亚稳态，瞬态的形式进行协调，（2）对同相和反相协调模式的偏好，（3）与姿态不对称和右侧横向偏爱相关的图案稳定性和相位超前的变化。视觉信息的可用性介导了观察到的协调模式的形式和稳定性。我们的发现证实了与维持直立姿势相关的亚稳态协调动力学。我们在评估HKB模型对理解姿势系统功能组织的效用的背景下讨论了这些发现的含义。