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首页> 外文期刊>International journal of human-computer studies >Effect of target distance on controllability for myocontrol
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Effect of target distance on controllability for myocontrol

机译：目标距离对脊髓控制的可控性的影响

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Myocontrol holds great promise because it has the potential to provide flexible and accurate prosthetic control that approaches the quality of normal movement. Speed and accuracy are important factors to consider when applying myoelectric signals to external devices. Fitts's law can be used to assess the speed-accuracy trade-off. We hypothesized that speed is affected not only by accuracy as prescribed by Fitts's law, but also by target distances independent of target size. A total of 12 healthy adult subjects were studied. Subjects controlled the vertical movement of a computer cursor by contracting their dominant first dorsal interosseus muscle to reach targets as quickly as possible. We manipulated twenty-five different target distances in order to obtain five indices of difficulty, as defined by Fitts's law, combined with five target widths. We tested the relationship between movement time and the index of difficulty as predicted by Fitts's law among different combinations of target distance and widths. Results showed a significant linear regression for all conditions, with the exception of a significantly longer movement time than predicted for targets close to the start point. Movements to these targets showed significantly higher relative variance during stabilization, higher overshoot, and lower success. Therefore, we found that with comparable index of difficulty, small distance movements had a higher variability, slower movement, and higher rates of error compared to larger distance movements. Our results are consistent with our hypothesis that low muscle activation required for short distances results in higher variability and low controllability in reaching the target as required by the task demand. Neurophysiological mechanisms underlying the violation of the Fitts's law relationship are discussed. These results have significance for myocontrol applications, and we suggest that such applications require control signals with sufficient recruitment to reduce variability at lower levels of muscle activation.
机译：Myocontrol具有很大的承诺，因为它有可能提供灵活和准确的假体控制，方法接近正常运动的质量。速度和准确性是将磁铁信号施加到外部设备时的重要因素。 FITTS的定律可用于评估速度准确性权衡。我们假设速度不仅受到FITTS法律规定的准确性，而且通过独立于目标大小的目标距离而受到影响。共有12个健康的成人受试者。受试者通过收缩其主导的第一背体肌肉，以尽快到达目标来控制计算机光标的垂直移动。我们操纵了二十五种不同的目标距离，以便获得五个难度指数，如Fitts的定律所定义，结合五个目标宽度。我们在不同组合的目标距离和宽度的不同组合中测试了运动时间与难度指数之间的关系。结果显示了所有条件的显着线性回归，除了比开始点接近的目标的移动时间明显更长的运动时间。这些目标的运动在稳定期间的相对相对方差显着更高，过冲更高，成功较低。因此，我们发现，通过可比难度指标，与较大的距离运动相比，小距离运动具有更高的可变性，较慢的运动和更高的误差速度。我们的结果与我们的假设一致，即短距离所需的低肌肉激活导致根据任务需求所要求的达到目标的可变性和低的可控性。讨论了违反FITTS法律关系的神经生理机制。这些结果对脊髓控制应用具有重要意义，我们建议这些应用需要控制信号充分募集，以降低较低水平的肌肉激活的可变性。

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