The statistics of natural hand movements.
The statistics of natural hand movements.
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DOI：
10.1007/s00221-008-1355-3
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发表时间：
2008-06
影响因子：
2
通讯作者：
Wolpert, Daniel M.
中科院分区：
文献类型：
--
作者：
Ingram, James N.;Kording, Konrad P.;Howard, Ian S.;Wolpert, Daniel M.
人类不断地使用双手与环境互动，并且在日常生活中自发地从事各种各样的手动活动。相比之下，基于实验室的手部功能研究使用了有限范围的预定义任务。因此，在日常生活中，手的自然动作很少受到关注。在这里，我们开发了一种便携式记录设备，可以由受试者佩戴，以跟踪他们的右手的运动，因为他们去他们的日常生活以外的实验室设置。我们使用各种统计方法分析运动学数据。关节角速度的主成分分析表明，前两个组成部分是高度保守的科目，解释60%的方差和定性相似，在以前的研究达到掌握运动。为了检验数字的独立性，我们开发了一种基于每个数字的运动可以从其他四个数字的运动线性预测的程度的测量。我们的独立性指标与以前的手部研究结果高度相关，包括初级运动皮层中数字表征的估计大小和数字个性化的其他实验室指标。具体而言，拇指被发现是最独立的手指和食指是最独立的手指。这些结果支持并扩展了基于实验室的人手研究。
Humans constantly use their hands to interact with the environment and they engage spontaneously in a wide variety of manual activities during everyday life. In contrast, laboratory-based studies of hand function have used a limited range of predefined tasks. The natural movements made by the hand during everyday life have thus received little attention. Here, we developed a portable recording device that can be worn by subjects to track movements of their right hand as they go about their daily routine outside of a laboratory setting. We analyse the kinematic data using various statistical methods. Principal component analysis of the joint angular velocities showed that the first two components were highly conserved across subjects, explained 60% of the variance and were qualitatively similar to those reported in previous studies of reach-to-grasp movements. To examine the independence of the digits, we developed a measure based on the degree to which the movements of each digit could be linearly predicted from the movements of the other four digits. Our independence measure was highly correlated with results from previous studies of the hand, including the estimated size of the digit representations in primary motor cortex and other laboratory measures of digit individuation. Specifically, the thumb was found to be the most independent of the digits and the index finger was the most independent of the fingers. These results support and extend laboratory-based studies of the human hand.
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