caa a22 4500 445354186 CHVBK 20180317142854.0 cr unu---uuuuu 170323e20110201xx s 000 0 eng 10.1007/s00221-010-2486-x doi (NATIONALLICENCE)springer-10.1007/s00221-010-2486-x Multi-finger pressing synergies change with the level of extra degrees of freedom [Elektronische Daten] [Sohit Karol, You-Sin Kim, Junfeng Huang, Yoon Kim, Kyung Koh, Bum Yoon, Jae Shim] The purpose of this study was to test the principle of motor abundance, which has been hypothesized as the principle by which the central nervous system controls the excessive degrees of freedom of the human movements, in contrast to the traditional negative view of motor redundancy. This study investigated the changes in force stabilizing and moment stabilizing synergies for multi-finger pressing tasks involving different number of fingers. Twelve healthy subjects produced a constant pressing force while watching visual feedback of the total pressing force for the fingers involved in each task. Based on the principle of motor abundance, it was hypothesized that the multi-finger synergies for the total force stabilizing synergy and the total moment stabilizing synergy would be greater as the number of task finger increases. Force stabilizing and moment stabilizing synergies were quantified using the framework of the uncontrolled manifold analysis. It was found that strong force stabilizing synergies existed for all the finger combinations. The index of force stabilizing synergies was greater when the task involved more number of fingers. The index of moment stabilizing synergies was negative for the two-finger combination, representing moment destabilizing synergies. However, the index of moment stabilizing synergies was positive for three-finger and four-finger combinations, representing strong moment stabilizing synergies for these finger combinations. We interpret the findings as an evidence for the principle of abundance for stabilization of both, total force as well as total moment. Springer-Verlag, 2010 Finger nationallicence Synergy nationallicence Motor abundance nationallicence Motor redundancy nationallicence Degrees of freedom nationallicence Karol Sohit Department of Kinesiology, University of Maryland, 20742, College Park, MD, USA aut Kim You-Sin Department of Kinesiology, University of Maryland, 20742, College Park, MD, USA aut Huang Junfeng Department of Kinesiology, University of Maryland, 20742, College Park, MD, USA aut Kim Yoon Department of Mechanical Engineering, Kyung Hee University, Global Campus, 130-701, Seoul, Korea aut Koh Kyung Department of Kinesiology, University of Maryland, 20742, College Park, MD, USA aut Yoon Bum Department of Kinesiology, University of Maryland, 20742, College Park, MD, USA aut Shim Jae Department of Kinesiology, University of Maryland, 20742, College Park, MD, USA aut Experimental Brain Research Springer-Verlag 208/3(2011-02-01), 359-367 0014-4819 208:3<359 2011 208 221 https://doi.org/10.1007/s00221-010-2486-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00221-010-2486-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Karol Sohit Department of Kinesiology, University of Maryland, 20742, College Park, MD, USA aut NATIONALLICENCE 700 1- Kim You-Sin Department of Kinesiology, University of Maryland, 20742, College Park, MD, USA aut NATIONALLICENCE 700 1- Huang Junfeng Department of Kinesiology, University of Maryland, 20742, College Park, MD, USA aut NATIONALLICENCE 700 1- Kim Yoon Department of Mechanical Engineering, Kyung Hee University, Global Campus, 130-701, Seoul, Korea aut NATIONALLICENCE 700 1- Koh Kyung Department of Kinesiology, University of Maryland, 20742, College Park, MD, USA aut NATIONALLICENCE 700 1- Yoon Bum Department of Kinesiology, University of Maryland, 20742, College Park, MD, USA aut NATIONALLICENCE 700 1- Shim Jae Department of Kinesiology, University of Maryland, 20742, College Park, MD, USA aut NATIONALLICENCE 773 0- Experimental Brain Research Springer-Verlag 208/3(2011-02-01), 359-367 0014-4819 208:3<359 2011 208 221 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer