Speed-Accuracy Trade-Off in a Trajectory-Constrained Self-Feeding Task: A Quantitative Index of Unsuppressed Motor Noise in Children With Dystonia.
Speed-Accuracy Trade-Off in a Trajectory-Constrained Self-Feeding Task: A Quantitative Index of Unsuppressed Motor Noise in Children With Dystonia.
复制标题
轨迹约束的自我进食任务中的速度与准确性权衡：肌张力障碍儿童未抑制运动噪声的定量指数。
DOI：
10.1177/0883073815578526
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发表时间：
2015-10
影响因子：
1.9
通讯作者：
Sanger TD
中科院分区：
文献类型：
--
作者：
Lunardini F;Bertucco M;Casellato C;Bhanpuri N;Pedrocchi A;Sanger TD
运动速度和准确性在儿童肌张力障碍中都受到影响。因此，得出速度-准确度函数是评估肌张力障碍运动损伤的重要指标。先前在肌张力障碍方面的工作研究了点对点任务期间的速度-准确性权衡。为了对肌张力障碍的功能能力进行更相关的测量，本研究调查了8名肌张力障碍儿童和8名健康儿童在轨迹受限的儿童相关任务中的上肢运动学和肌电图活动，该任务模拟用勺子自我喂食，需要连续监测准确性。通过改变勺子大小来产生不同的精度要求来检查速度和精度之间的权衡。结果表明，轨迹约束的速度-精度关系在两组中都存在，但在肌张力障碍中，它在斜率增加和运动时间延长方面发生了变化。研究结果与肌张力障碍中信号依赖性噪声增加的假设一致，这可能部分解释了肌张力障碍中观察到的缓慢和可变的运动。
Motor speed and accuracy are both affected in childhood dystonia. Thus, deriving a speed-accuracy function is an important metric for assessing motor impairments in dystonia. Previous work in dystonia studied the speed-accuracy trade-off during point-to-point tasks. To achieve a more relevant measurement of functional abilities in dystonia, the present study investigates upper-limb kinematics and electromyographic activity of 8 children with dystonia and 8 healthy children during a trajectory-constrained child-relevant task that emulates self-feeding with a spoon and requires continuous monitoring of accuracy. The speed-accuracy trade-off is examined by changing the spoon size to create different accuracy demands. Results demonstrate that the trajectory-constrained speed-accuracy relation is present in both groups, but it is altered in dystonia in terms of increased slope and offset towards longer movement times. Findings are consistent with the hypothesis of increased signal-dependent noise in dystonia, which may partially explain the slow and variable movements observed in dystonia.