Prehension synergies during nonvertical grasping, I: experimental observations

Biological cybernetics
Todd C PatakyV M Zatsiorsky

Abstract

The mechanical complexities of rotating an object through the gravity field present a formidable challenge to the human central nervous system (CNS). The current study documents the finger force patterns selected by the CNS when performing one-, two-, and four-finger grasping while holding an object statically at various orientations with respect to vertical. Numerous mechanically "unnecessary" behaviors were observed. These included: nonzero tangential forces for horizontal handle orientations, large internal forces (i.e., those in excess of equilibrium requirements) for all orientations, and safety margins between 50 and 90%. Additionally, none of the investigated measures were constant across orientations or could be represented as a simple trigonometric function of orientation. Nonetheless, all measures varied in systematic (and sometimes symmetric) ways with orientation. The results suggest that the CNS selects force patterns that are based on mechanical principles but also that are not simply related to object orientation. This study is complemented by a second paper that provides an in-depth analysis of the mechanics of nonvertical grasping and accounts for many of the observed results with numerical optimization (see Pa...Continue Reading

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Jul 12, 2002·Biological cybernetics·Vladimir M ZatsiorskyMark L Latash
Jul 12, 2002·Biological cybernetics·Vladimir M ZatsiorskyMark L Latash
Feb 5, 2003·Biological cybernetics·Frédéric DanionVladimir M Zatsiorsky
Mar 9, 2004·Journal of Applied Physiology·Jae Kun ShimMark L Latash
Jun 19, 2004·Ergonomics·Todd PatakyVladimir Zatsiorsky
Oct 27, 2004·Biological cybernetics·Todd C PatakyVladimir M Zatsiorsky
Jun 1, 2005·Journal of Biomechanics·Todd C PatakyVladimir M Zatsiorsky

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Citations

Feb 24, 2006·Experimental Brain Research·Tomoko AokiVladimir M Zatsiorsky
May 25, 2007·Experimental Brain Research·Woo-Hyung ParkSheng Li
May 20, 2008·Experimental Brain Research·Woo-Hyung ParkSheng Li
Jun 17, 2008·Experimental Brain Research·Mark K BudgeonVladimir M Zatsiorsky
Dec 11, 2008·Experimental Brain Research·Stacey L GorniakMark L Latash
Jan 14, 2009·Experimental Brain Research·Xun NiuVladimir M Zatsiorsky
Jan 1, 2010·Experimental Brain Research·Stacey L GorniakMark L Latash
Jun 15, 2011·Experimental Brain Research·Stacey L GorniakMark 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
Apr 30, 2013·Experimental Brain Research·Satyajit S AmbikeVladimir M Zatsiorsky
Oct 27, 2004·Biological cybernetics·Todd C PatakyVladimir M Zatsiorsky
Apr 25, 2007·Ergonomics·Jae Kun ShimVladimir M Zatsiorsky
Dec 2, 2005·Journal of Neurophysiology·Vladimir M ZatsiorskyMark L Latash
Aug 1, 2007·Journal of Motor Behavior·Tomoko AokiVladimir M Zatsiorsky
Sep 11, 2008·Journal of Motor Behavior·Vladimir M Zatsiorsky, Mark L Latash
Jan 12, 2010·Human Movement Science·Jaebum ParkJae Kun Shim
Nov 28, 2006·Neuroscience Letters·Paulo Barbosa FreitasSlobodan Jaric

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