Amplitude versus spatially modulated electrotactile feedback for myoelectric control of two degrees of freedom
Amplitude versus spatially modulated electrotactile feedback for myoelectric control of two degrees of freedom
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DOI：
10.1088/1741-2552/aba4fd
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发表时间：
2020-08-01
影响因子：
4
通讯作者：
Dosen, Strahinja
中科院分区：
文献类型：
--
作者：
Garenfeld, Martin A.;Mortensen, Christian K.;Dosen, Strahinja
目标。肌电假体的人工本体感觉反馈是提高体现和用户满意度的一个重要方面，可能降低在日常任务中控制假体时对视觉注意力的需求。现代肌电假肢是先进的多自由度机电一体化系统，因此，为了传达假肢的状态，反馈接口需要同时传输多个变量。在肌电控制过程中，通过多通道电触觉刺激来传递腕部旋转和手孔两种不同的本体感受信息，并对两种不同的配置进行了研究。方法：在优势前臂上获取肌电记录，在非优势前臂上使用紧凑的接口传递电触觉刺激。第一种反馈配置基于空间编码，通过移动的触觉刺激传递信息，而第二种基于幅度的配置通过感觉强度传递位置。13名身体健全的受试者使用基于模式分类的肌电控制和两种反馈配置来完成目标到达任务。主要的结果。两种配置均具有较高的任务性能（完成率> 90%），在完成率、到达目标时间、距离误差和路径效率方面均无显著差异。总体而言，结果表明，尽管使用紧凑的刺激界面，两种反馈配置都允许受试者感知和解释同时传递的两个反馈变量。这是一个令人鼓舞的结果，为交流多功能手假体的完整状态的前景。
Objective.Artificial proprioceptive feedback from a myoelectric prosthesis is an important aspect in enhancing embodiment and user satisfaction, possibly lowering the demand for visual attention while controlling a prosthesis in everyday tasks. Contemporary myoelectric prostheses are advanced mechatronic systems with multiple degrees of freedom, and therefore, to communicate the prosthesis state, the feedback interface needs to transmit several variables simultaneously. In the present study, two different configurations for conveying proprioceptive information of wrist rotation and hand aperture through multichannel electrotactile stimulation were developed and evaluated during online myoelectric control.Approach.Myoelectric recordings were acquired from the dominant forearm and electrotactile stimulation was delivered on the non-dominant forearm using a compact interface. The first feedback configuration, which was based on spatial coding, transmitted the information using a moving tactile stimulus, whereas the second, amplitude-based configuration conveyed the position via sensation intensity. Thirteen able-bodied subjects used pattern classification-based myoelectric control with both feedback configurations to accomplish a target-reaching task.Main results.High task performance (completion rate > 90%) was observed for both configurations, with no significant difference in completion rate, time to reach the target, distance error and path efficiency, respectively.Significance.Overall, the results demonstrated that both feedback configurations allowed subjects to perceive and interpret two feedback variables delivered simultaneously, despite using a compact stimulation interface. This is an encouraging result for the prospect of communicating the full state of a multifunctional hand prosthesis.