Farrell Todd R, Weir Richard F
Department of Biomedical Engineering, Northwestern University Prosthetics Research Laboratory, Chicago, IL 60611, USA.
IEEE Trans Neural Syst Rehabil Eng. 2007 Mar;15(1):111-8. doi: 10.1109/TNSRE.2007.891391.
A tradeoff exists when considering the delay created by multifunctional prosthesis controllers. Large controller delays maximize the amount of time available for EMG signal collection and analysis (and thus maximize classification accuracy); however, large delays also degrade prosthesis performance by decreasing the responsiveness of the prosthesis. To elucidate an "optimal controller delay" twenty able-bodied subjects performed the Box and Block Test using a device called PHABS (prosthetic hand for able bodied subjects). Tests were conducted with seven different levels of controller delay ranging from nearly 0-300 ms and with two different artificial hand speeds. Based on repeted measures ANOVA analysis and a linear mixed effects model, the optimal controller delay was found to range between approximately 100 ms for fast prehensors and 125 ms for slower prehensors. Furthermore, the linear mixed effects model shows that there is a linear degradation in performance with increasing delay.
在考虑多功能假肢控制器所产生的延迟时，存在一种权衡。较大的控制器延迟能使肌电信号采集和分析的可用时间最大化（从而使分类准确率最大化）；然而，较大的延迟也会因降低假肢的响应能力而降低假肢性能。为了阐明“最佳控制器延迟”，20名身体健全的受试者使用一种名为PHABS（适用于身体健全受试者的假手）的设备进行了箱块测试。测试在七种不同水平的控制器延迟下进行，延迟范围从近0到300毫秒，并采用两种不同的假手速度。基于重复测量方差分析和线性混合效应模型，发现快速抓握器的最佳控制器延迟约为100毫秒，较慢抓握器的最佳控制器延迟约为125毫秒。此外，线性混合效应模型表明，随着延迟增加，性能呈线性下降。
