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Paper Abstract and Keywords
Presentation 2017-03-14 11:15
Experimental evaluation of voluntarily activatable muscle synergies
Shunta Togo (UEC/ATR), Hiroshi Imamizu (Tokyo Univ./ATR) NC2016-77
Abstract (in Japanese) (See Japanese page) 
(in English) This study tested hypothesis that the individual muscle synergies extracted by non-negative matrix factorization (NMF) is voluntarily activatable. Subjects performed isometric force production task, and their 13 muscle activity patterns were measured. We extracted the muscle synergies with different sparsity through NMF with the different numbers of muscle synergies. We defined a conventional muscle synergy which was extracted based on the variability accounted for (VAF) and the coefficient of determination (CD), and on the index one more than VAF or CD. We also defined a extended muscle synergy that was sparser than the conventional muscle synergy. We calculated the index which reflected a parallelism between tested one muscle synergy vector and current muscle activation vector of subject. Subjects were visually feed backed calculated index, and tried to activate the individual muscle synergy. As a result, average of 90.8% of the muscle synergy extracted by the VAF was significantly activated. However, a rate of activatable muscle synergies of the other conventional muscle synergies was lower. Moreover, average of 25.5% of the extended muscle synergy was significantly activatable. Therefore, our results partly support the hypothesis, and indicate that the appropriate index can estimate voluntarily activatable muscle synergies through NMF. Moreover, it is suggested that the CNS can use extended muscle synergies to perform voluntary movements.
Keyword (in Japanese) (See Japanese page) 
(in English) Muscle synergies / Non-negative matrix factorization / Motor primitive / EMG / Isometric force / / /  
Reference Info. IEICE Tech. Rep., vol. 116, no. 521, NC2016-77, pp. 79-84, March 2017.
Paper # NC2016-77 
Date of Issue 2017-03-06 (NC) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF NC2016-77

Conference Information
Committee MBE NC  
Conference Date 2017-03-13 - 2017-03-14 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikai-Shinko-Kaikan Bldg. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To NC 
Conference Code 2017-03-MBE-NC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Experimental evaluation of voluntarily activatable muscle synergies 
Sub Title (in English)  
Keyword(1) Muscle synergies  
Keyword(2) Non-negative matrix factorization  
Keyword(3) Motor primitive  
Keyword(4) EMG  
Keyword(5) Isometric force  
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1st Author's Name Shunta Togo  
1st Author's Affiliation The University of Electro-Communications/Advanced Telecommunications Research Institute International (UEC/ATR)
2nd Author's Name Hiroshi Imamizu  
2nd Author's Affiliation The University of Tokyo/Advanced Telecommunications Research Institute International (Tokyo Univ./ATR)
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Speaker Author-1 
Date Time 2017-03-14 11:15:00 
Presentation Time 25 minutes 
Registration for NC 
Paper # NC2016-77 
Volume (vol) vol.116 
Number (no) no.521 
Page pp.79-84 
#Pages 6 
Date of Issue 2017-03-06 (NC) 

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