Motor entropy in response to task demands and environmental information
Motor entropy in response to task demands and environmental information
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DOI：
10.1063/1.2979695
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发表时间：
2008-09-01
期刊：
影响因子：
2.9
通讯作者：
Newell, Karl M.
中科院分区：
文献类型：
--
作者：
Hong, S. Lee;Newell, Karl M.
该实验检验了这样的假设：人类运动适应可以表示为跨任务、有机体和环境的熵守恒。健康的年轻人用惯用手的食指产生次最大等长力。受试者在不同的任务需求（容错）和环境信息（反馈频率）条件下执行此任务。为了扩展之前的发现，我们采用近似熵（ApEn）来捕获等长力变化的时间方面，并与人类行为时间序列的其他研究建立联系。我们表明，以满足任务要求为条件的力时间序列的 ApEn 随着任务要求的增加和环境信息的减少而减少。任务和环境之间在力动力学上存在补偿性相互作用，可以用二次曲面表示，捕获总方差的 92%。我们的结果表明，当面临实现任务目标的可能性降低（任务熵增加）和提供很少信息的环境（环境熵增加）时，受试者随着时间的推移采用类似的力生产策略，从而形成更规则的模式。 (C) 2008 年美国物理研究所。
This experiment tested the hypothesis that human motor adaptation can be represented as the conservation of entropy across the task, organism, and environment. Healthy young individuals generated a submaximal isometric force with the index finger of their dominant hand. Subjects performed this task under different task demands (error tolerance) and environmental information (feedback frequency) conditions. In order to extend previous findings, we employ the use of approximate entropy (ApEn) to capture the temporal aspects of the variability in the isometric force and to create links to other studies of time-series in human behavior. We showed that ApEn of the force time-series, made conditional upon satisfying the task demands, decreased as the task demands were increased and the environmental information reduced. There was a compensatory interaction between task and environment on the force dynamics that could be represented by a quadratic surface, capturing 92% of the total variance. Our results show that when faced with a reduced likelihood of achieving the task goal (increased task entropy) and an environment that provides little information (increased environmental entropy), the subjects employed similar force production strategies over time, resulting in a more regular pattern. (C) 2008 American Institute of Physics.