Sensitivity of smoothness measures to movement duration, amplitude, and arrests.
Sensitivity of smoothness measures to movement duration, amplitude, and arrests.
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DOI：
10.3200/35-09-004-rc
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发表时间：
2009-11
影响因子：
1.4
通讯作者：
Sternad D
中科院分区：
文献类型：
--
作者：
Hogan N;Sternad D
对感觉运动表现的研究，包括那些与年龄、疾病或治疗干预有关的变化，通常使用基于加加速度的时间导数的测量来量化平滑和协调。然而，结果是喜忧参半，一些研究报告敏感的细微差异的歧视，其他未能找到显着的差异，即使他们显然存在。造成这种状况的一个原因是，采用了不同的尺度和不同的比例系数。这些措施是敏感的运动幅度和/或持续时间不同程度。我们发现，基于抽搐的措施与尺寸的变化与运动的平滑性反直觉，而无量纲的基于抽搐的措施适当量化的共同偏差，从平滑，协调的运动。
Studies of sensory-motor performance, including those concerned with changes due to age, disease or therapeutic intervention, often use measures based on jerk, the time-derivative of acceleration, to quantify smoothness and coordination. However, results have been mixed, some studies reporting sensitive discrimination of subtle differences, others failing to find significant differences, even when they are obviously present. One reason for this state of affairs is that different measures have been used with different scaling factors. These measures are sensitive to movement amplitude and/or duration to different degrees. We show that jerk-based measures with dimensions vary counter-intuitively with movement smoothness, whereas a dimensionless jerk-based measure properly quantifies common deviations from smooth, coordinated movement.