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Finger Angle Estimation From Array EMG System Using Linear Regression Model With Independent Component Analysis

Surface ElectroMyoGraphy (EMG) signals from the forearm used in prosthetic hand and finger control systems require precise anatomy data of finger muscles that are small and located deep within the forearm. The main problem of this method is that the signal quality depends on the placement of EMG sen...

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Autores principales: Stapornchaisit, Sorawit, Kim, Yeongdae, Takagi, Atsushi, Yoshimura, Natsue, Koike, Yasuharu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6775184/
https://www.ncbi.nlm.nih.gov/pubmed/31616274
http://dx.doi.org/10.3389/fnbot.2019.00075
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author Stapornchaisit, Sorawit
Kim, Yeongdae
Takagi, Atsushi
Yoshimura, Natsue
Koike, Yasuharu
author_facet Stapornchaisit, Sorawit
Kim, Yeongdae
Takagi, Atsushi
Yoshimura, Natsue
Koike, Yasuharu
author_sort Stapornchaisit, Sorawit
collection PubMed
description Surface ElectroMyoGraphy (EMG) signals from the forearm used in prosthetic hand and finger control systems require precise anatomy data of finger muscles that are small and located deep within the forearm. The main problem of this method is that the signal quality depends on the placement of EMG sensor, which can significantly affects the accuracy and precision to estimate joint angles or forces. Moreover, in case of amputees, the location of finger muscles is unknown and needed to be identified manually for EMG recording. As a result, most modern prosthetic hands utilize limited number of muscles with pattern recognition to control finger according to pre-defined grip which is unable to mimic natural finger motion. To address such issue, we used array EMG sensors to obtain EMG signals from all possible positions on the forearm and applied regression method to produce natural finger motion. The signals were analyzed using independent component analysis (ICA) to find the best-fitted independent component (IC) that matches the anatomical data taken after the experiment. Next, from the IC and EMG signals, finger angles were estimated using linear regression model (LRM). Each finger was assigned EMG and IC component for flexion and extension muscles, to assess the possibility of controlling each finger angle separately. We compared the joint angles of each finger between calculated from IC and EMG by correlation coefficients (CC) for all fingers. The average CC values were higher than 0.7, demonstrating the strength of the linear relationship. The different between IC and EMG methods suggests that the IC method can reduce noise and increase the signal to noise ratio. The performance of ICA method showed higher CC value at around 0.2 ± 0.10. In order to confirm the performance of ICA method, we also tested mathematical musculoskeletal model (MSM). The result from this study showed that not only array EMG sensors with ICA significantly improve the quality of signal detected from forearm but also reduce problems of conventional EMG sensors and consequently improve the performance of regression method to imitate natural finger motion.
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spelling pubmed-67751842019-10-15 Finger Angle Estimation From Array EMG System Using Linear Regression Model With Independent Component Analysis Stapornchaisit, Sorawit Kim, Yeongdae Takagi, Atsushi Yoshimura, Natsue Koike, Yasuharu Front Neurorobot Neuroscience Surface ElectroMyoGraphy (EMG) signals from the forearm used in prosthetic hand and finger control systems require precise anatomy data of finger muscles that are small and located deep within the forearm. The main problem of this method is that the signal quality depends on the placement of EMG sensor, which can significantly affects the accuracy and precision to estimate joint angles or forces. Moreover, in case of amputees, the location of finger muscles is unknown and needed to be identified manually for EMG recording. As a result, most modern prosthetic hands utilize limited number of muscles with pattern recognition to control finger according to pre-defined grip which is unable to mimic natural finger motion. To address such issue, we used array EMG sensors to obtain EMG signals from all possible positions on the forearm and applied regression method to produce natural finger motion. The signals were analyzed using independent component analysis (ICA) to find the best-fitted independent component (IC) that matches the anatomical data taken after the experiment. Next, from the IC and EMG signals, finger angles were estimated using linear regression model (LRM). Each finger was assigned EMG and IC component for flexion and extension muscles, to assess the possibility of controlling each finger angle separately. We compared the joint angles of each finger between calculated from IC and EMG by correlation coefficients (CC) for all fingers. The average CC values were higher than 0.7, demonstrating the strength of the linear relationship. The different between IC and EMG methods suggests that the IC method can reduce noise and increase the signal to noise ratio. The performance of ICA method showed higher CC value at around 0.2 ± 0.10. In order to confirm the performance of ICA method, we also tested mathematical musculoskeletal model (MSM). The result from this study showed that not only array EMG sensors with ICA significantly improve the quality of signal detected from forearm but also reduce problems of conventional EMG sensors and consequently improve the performance of regression method to imitate natural finger motion. Frontiers Media S.A. 2019-09-26 /pmc/articles/PMC6775184/ /pubmed/31616274 http://dx.doi.org/10.3389/fnbot.2019.00075 Text en Copyright © 2019 Stapornchaisit, Kim, Takagi, Yoshimura and Koike. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Neuroscience
Stapornchaisit, Sorawit
Kim, Yeongdae
Takagi, Atsushi
Yoshimura, Natsue
Koike, Yasuharu
Finger Angle Estimation From Array EMG System Using Linear Regression Model With Independent Component Analysis
title Finger Angle Estimation From Array EMG System Using Linear Regression Model With Independent Component Analysis
title_full Finger Angle Estimation From Array EMG System Using Linear Regression Model With Independent Component Analysis
title_fullStr Finger Angle Estimation From Array EMG System Using Linear Regression Model With Independent Component Analysis
title_full_unstemmed Finger Angle Estimation From Array EMG System Using Linear Regression Model With Independent Component Analysis
title_short Finger Angle Estimation From Array EMG System Using Linear Regression Model With Independent Component Analysis
title_sort finger angle estimation from array emg system using linear regression model with independent component analysis
topic Neuroscience
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6775184/
https://www.ncbi.nlm.nih.gov/pubmed/31616274
http://dx.doi.org/10.3389/fnbot.2019.00075
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