Modulation of grasping forces during object transport

Journal of Neurophysiology
Michael A Smith, John F Soechting

Abstract

Subjects held an instrumented object in a tripod grasp and moved it in the horizontal plane in various directions. The contact forces at the digits were measured and the grip force was decomposed into 2 components: a manipulating force responsible for accelerating the object and a grasping force responsible for holding the object steady. The grasping forces increased during the movement, reaching a peak near the time of peak velocity. The grasping forces also exhibited directional tuning, but this tuning was idiosyncratic for each subject. Although the overall grip forces should be modulated with acceleration, the load force did not vary during the task. Therefore the increase in the grasping force is not required to prevent slip. Rather, it is suggested that grasping force increases during translational motion to stabilize the orientation of grasped objects.

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Citations

May 25, 2005·Experimental Brain Research·Fan GaoVladimir M Zatsiorsky
Jul 8, 2011·Experimental Brain Research·Gregory P SlotaVladimir M Zatsiorsky
Sep 11, 2008·Journal of Motor Behavior·Vladimir M Zatsiorsky, Mark L Latash
Apr 30, 2013·Experimental Brain Research·Satyajit S AmbikeVladimir M Zatsiorsky
Jun 8, 2007·Journal of Neurophysiology·Sara A WingesMartha Flanders
Feb 1, 2008·Journal of Neurophysiology·Sara A WingesMartha Flanders
Aug 1, 2015·Experimental Brain Research·Paolo Viviani, Francesco Lacquaniti
Aug 21, 2015·Journal of Neurophysiology·Billy C VermillionSang Wook Lee
May 18, 2011·Journal of Applied Biomechanics·Joel R MartinVladimir M Zatsiorsky
Jul 9, 2010·Journal of Hand Therapy : Official Journal of the American Society of Hand Therapists·Elizabeth R Andersen HammondBarbara L Shay

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