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Channel selection for simultaneous and proportional myoelectric prosthesis control of multiple degrees-of-freedom

Authors
Hwang, Han-JeongHahne, Janne MathiasMueller, Klaus-Robert
Issue Date
10월-2014
Publisher
IOP PUBLISHING LTD
Keywords
channel selection; least absolute shrinkage and selection operator (LASSO); sequential feature selection (SFS); uniform selection; simultaneous myoelectric control; prosthetic hand; electromyography (EMG)
Citation
JOURNAL OF NEURAL ENGINEERING, v.11, no.5
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF NEURAL ENGINEERING
Volume
11
Number
5
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/97240
DOI
10.1088/1741-2560/11/5/056008
ISSN
1741-2560
Abstract
Objective. Recent studies have shown the possibility of simultaneous and proportional control of electrically powered upper-limb prostheses, but there has been little investigation on optimal channel selection. The objective of this study is to find a robust channel selection method and the channel subsets most suitable for simultaneous and proportional myoelectric prosthesis control of multiple degrees-of-freedom (DoFs). Approach. Ten able-bodied subjects and one person with congenital upper-limb deficiency took part in this study, and performed wrist movements with various combinations of two DoFs (flexion/extension and radial/ulnar deviation). During the experiment, high density electromyographic (EMG) signals and the actual wrist angles were recorded with an 8 x 24 electrode array and a motion tracking system, respectively. The wrist angles were estimated from EMG features with ridge regression using the subsets of channels chosen by three different channel selection methods: (1) least absolute shrinkage and selection operator (LASSO), (2) sequential feature selection (SFS), and (3) uniform selection (UNI). Main results. SFS generally showed higher estimation accuracy than LASSO and UNI, but LASSO always outperformed SFS in terms of robustness, such as noise addition, channel shift and training data reduction. It was also confirmed that about 95% of the original performance obtained using all channels can be retained with only 12 bipolar channels individually selected by LASSO and SFS. Significance. From the analysis results, it can be concluded that LASSO is a promising channel selection method for accurate simultaneous and proportional prosthesis control. We expect that our results will provide a useful guideline to select optimal channel subsets when developing clinical myoelectric prosthesis control systems based on continuous movements with multiple DoFs.
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