Walking humans trade off different task goals to regulate lateral stepping.
Walking humans trade off different task goals to regulate lateral stepping.
复制标题
行走的人类权衡不同的任务目标，以调节横向步进。
DOI：
10.1016/j.jbiomech.2021.110314
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发表时间：
2021-04-15
影响因子：
2.4
通讯作者：
Dingwell JB
中科院分区：
文献类型：
--
作者：
Render AC;Kazanski ME;Cusumano JP;Dingwell JB
人们在复杂的环境中行走，他们必须调整步伐以保持平衡并满足不断变化的任务目标。人们如何做到这一点并不清楚。我们最近开发了横向步进的计算模型，基于作为运动调节模板的目标等效流形，以确定人们如何从一步到一步调节步行运动。在正常的步行，健康的成年人强烈保持步宽，但也在他们的路径上的横向位置。在这里，我们使用这个框架来提出实验室可检验的假设，人类如何可能会适应他们的横向步进动力学时，要求优先考虑不同的步进目标。参与者在4种条件下在虚拟现实环境中的跑步机上行走：正常行走，同时在每一步给予直接反馈以保持恒定的步长，恒定的绝对横向位置或恒定的航向（方向）。提取横向步进变量的时间序列，并量化变异性和统计持久性（反映逐步调节）。在每个反馈条件下，与正常行走相比，参与者的规定步进变量的变异性较小。步进调节结果支持我们的模型的预测：为了保持恒定的步长或位置，人们要么保持或增加规定变量的调节，但也减少了其补充的调节。因此，人们以特定任务目标确定的可预测和系统的方式调节侧足位置。人类调节踏步动作不仅是为了“走路”（不摔倒），而且是为了在特定环境中完成特定目标导向的任务。这里介绍的框架和运动调节模板捕捉了这些重要的相互作用。
People walk in complex environments where they must adapt their steps to maintain balance and satisfy changing task goals. How people do this is not well understood. We recently developed computational models of lateral stepping, based on Goal Equivalent Manifolds that serve as motor regulation templates, to identify how people regulate walking movements from step-to-step. In normal walking, healthy adults strongly maintain step width, but also lateral position on their path. Here, we used this framework to pose empirically-testable hypotheses about how humans might adapt their lateral stepping dynamics when asked to prioritize different stepping goals. Participants walked on a treadmill in a virtual-reality environment under 4 conditions: normal walking, and while given direct feedback at each step to maintain constant step width, constant absolute lateral position, or constant heading (direction). Time series of lateral stepping variables were extracted, and variability and statistical persistence (reflecting step-to-step regulation) quantified. Participants exhibited less variability of the prescribed stepping variable compared to normal walking during each feedback condition. Stepping regulation results supported our models’ predictions: to maintain constant step width or position, people either maintained or increased regulation of the prescribed variable, but also decreased regulation of its complement. Thus, people regulated lateral foot placements in predictable and systematic ways determined by specific task goals. Humans regulate stepping movements to not only “just walk” (step without falling), but also to achieve specific goal-directed tasks within a specific environment. The framework and motor regulation templates presented here capture these important interactions.
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影响因子：
4.3
作者：
John J;Dingwell JB;Cusumano JP
通讯作者：
Cusumano JP
DOI：
10.1016/j.cub.2018.03.008
发表时间：
2018-04-23
期刊：
Current biology : CB
影响因子：
--
作者：
Matthis JS;Yates JL;Hayhoe MM
通讯作者：
Hayhoe MM
影响因子：
9.2
作者：
Kuo, AD
通讯作者：
Kuo, AD
影响因子：
4.6
作者：
Dean, J. C.;Alexander, N. B.;Kuo, A. D.
通讯作者：
Kuo, A. D.
影响因子：
2.4
作者：
Dingwell, Jonathan B.;Cusumano, Joseph P.
通讯作者：
Cusumano, Joseph P.