Force sharing among fingers as a model of the redundancy problem

Experimental Brain Research
Z M LiV M Zatsiorsky

Abstract

The aim of this study was to test Bernstein's idea that motor synergies provide solutions to the motor redundancy problem. Forces produced by individual fingers of one hand were recorded in one-, two-, three-, and four-finger tasks. The subjects (n=10) were asked to produce maximal total force (maximal voluntary contraction, MVC) and to match a ramp total force profile using different combinations of fingers. We found that individual finger forces were smaller in multifinger MVC tasks than in single-finger tasks. The deficit increased with the number of fingers involved. A saturation effect was observed: when several effectors were involved, adding a new effector did not significantly change the total force output. The data confirmed the idea that the central neural drive arriving at the level of synergies has a certain limit, a ceiling, that cannot be exceeded. The central nervous system cannot maximally activate the muscles serving all the fingers at the same time. Secondly, during the course of ramp trials, forces produced by individual fingers were linearly related to each other. Hence, a force sharing pattern was established at the beginning of the trial and did not change during the ramp period. A hypothesis is suggested ...Continue Reading

Citations

Dec 13, 2002·Experimental Brain Research·V M ZatsiorskyM L Latash
Aug 5, 2003·Experimental Brain Research·Jae K ShimVladimir M Zatsiorsky
Aug 24, 2004·Experimental Brain Research·Halla OlafsdottirMark L Latash
Feb 24, 2005·Experimental Brain Research·Fan GaoVladimir M Zatsiorsky
Jan 20, 2005·Experimental Brain Research·J-F Yang, J P Scholz
Jul 22, 2005·Experimental Brain Research·Yun WangMark L Latash
Sep 30, 2005·Experimental Brain Research·Minoru ShinoharaTetsuo Fukunaga
Mar 17, 2005·Experimental Brain Research·Jae Kun ShimMark L Latash
Mar 18, 2006·Experimental Brain Research·E G Cruz, D G Kamper
May 26, 2006·Experimental Brain Research·Sun Wook KimMark L Latash
Jun 17, 2006·Experimental Brain Research·Wei ZhangMark L Latash
Sep 1, 2006·Experimental Brain Research·Wei ZhangMark L Latash
Nov 15, 2006·Experimental Brain Research·Stacey L GorniakMark L Latash
May 25, 2007·Experimental Brain Research·Woo-Hyung ParkSheng Li
Aug 19, 2007·Experimental Brain Research·Stacey L GorniakMark L Latash
Aug 11, 2007·Experimental Brain Research·Nick J Davis
Aug 29, 2007·Experimental Brain Research·Tadayoshi AsakaMark L Latash
Apr 22, 2008·Experimental Brain Research·Elena Yu ShapkovaMark L Latash
May 20, 2008·Experimental Brain Research·Woo-Hyung ParkSheng Li
Nov 6, 2008·Experimental Brain Research·Joel R MartinVladimir M Zatsiorsky
Jan 14, 2009·Experimental Brain Research·Xun NiuVladimir M Zatsiorsky
Mar 26, 2010·Experimental Brain Research·Shweta KapurMark L Latash
Oct 16, 2010·Experimental Brain Research·Jaebum ParkMark L Latash
Nov 26, 2010·Experimental Brain Research·J R MartinM L Latash
Apr 27, 2011·Experimental Brain Research·Jaebum ParkMark L Latash
May 4, 2011·Experimental Brain Research·Vennila KrishnanMark L Latash
Jul 8, 2011·Experimental Brain Research·Gregory P SlotaVladimir M Zatsiorsky
Jul 29, 2011·Experimental Brain Research·Yao SunMark L Latash
Nov 11, 2011·Experimental Brain Research·Yen-Hsun WuMark L Latash
Dec 2, 2011·Experimental Brain Research·Jaebum ParkMark L Latash
Oct 20, 2012·Experimental Brain Research·Y XuV M Zatsiorsky
Jun 6, 2013·Experimental Brain Research·Pinar Arpinar-AvsarMark L Latash
Aug 15, 2013·Experimental Brain Research·Jaebum ParkMark L Latash
Jul 12, 2002·Biological cybernetics·Vladimir M ZatsiorskyMark L Latash
Jul 12, 2002·Biological cybernetics·Vladimir M ZatsiorskyMark L Latash
Sep 21, 2004·Biological cybernetics·Todd C PatakyVladimir M Zatsiorsky
Jul 14, 2006·Biological cybernetics·Simon R Goodman, Mark L Latash
Oct 6, 2007·Cognitive Processing·Bruno BerberianMarie-Dominique Giraudo
Apr 6, 2004·Human Movement Science·Peter Braido, Xudong Zhang
Dec 4, 2003·Neuroscience Letters·Jae Kun ShimVladimir M Zatsiorsky
May 11, 2005·Neuroscience Letters·Halla OlafsdottirMark L Latash
Apr 2, 2003·Human Movement Science·Mark L LatashGregor Schöner

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