arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.11445cs.ROcs.HC
收藏

信号无关噪声驱动的非同位力反馈的评价

Evaluation of Non-Collocated Force Feedback Driven by Signal-Independent Noise

Stanford University(斯坦福大学)

Zonghe Chua, Allison M. Okamura, Darrel R. Deo

摘要:

患有瘫痪或截肢的人可以使用基于他们的意图或尝试移动的输入信号来操作机器人假肢。由于这些人的感觉功能丧失或减弱,因此触觉反馈必须是非同位的。皮质内脑机接口(iBCI)为瘫痪患者提供了各种神经假体。iBCI的一个重要属性是其输入信号包含与信号无关的噪声。为了了解信号无关噪声对具有非同位触觉反馈的系统的影响,并告知基于iBCI的假肢控制策略,我们用传统的触觉接口作为iBCI的代理进行了实验。身体健全的用户的任务是使用右手的输入在虚拟环境中定位一个缩进。非同位触觉反馈的交互力在虚拟环境中增强了三个不同幅度的噪声,并同时呈现在用户的左手。我们发现,在距离误差的猜测的压痕位置,平均每次审判的时间,平均峰值绝对位移和速度的工具运动在本地化的最高噪声水平相比,其他两个级别的增加。研究结果表明,用户有一个阈值的干扰拒绝,他们试图通过他们的探索行动,以增加他们的信噪比。

英文摘要:

Individuals living with paralysis or amputation can operate robotic prostheses using input signals based on their intent or attempt to move. Because sensory function is lost or diminished in these individuals, haptic feedback must be non-collocated. The intracortical brain computer interface (iBCI) has enabled a variety of neural prostheses for people with paralysis. An important attribute of the iBCI is that its input signal contains signal-independent noise. To understand the effects of signal-independent noise on a system with non-collocated haptic feedback and inform iBCI-based prostheses control strategies, we conducted an experiment with a conventional haptic interface as a proxy for the iBCI. Able-bodied users were tasked with locating an indentation within a virtual environment using input from their right hand. Non-collocated haptic feedback of the interaction forces in the virtual environment was augmented with noise of three different magnitudes and simultaneously rendered on users' left hands. We found increases in distance error of the guess of the indentation location, mean time per trial, mean peak absolute displacement and speed of tool movements during localization for the highest noise level compared to the other two levels. The findings suggest that users have a threshold of disturbance rejection and that they attempt to increase their signal-to-noise ratio through their exploratory actions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑