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Title of Journal: Exp Brain Res

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Abbravation: Experimental Brain Research

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Springer-Verlag

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DOI

10.1002/ccr3.89

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1432-1106

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Prehension synergies trialtotrial variability a

Authors: Jae K Shim Mark L Latash Vladimir M Zatsiorsky
Publish Date: 2003/07/26
Volume: 152, Issue: 2, Pages: 173-184
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Abstract

We studied multidigit synergies as relations among digit forces and points of their application across multiple repetitions of a static prehensile task The task required holding a grasped object 149 N against different external torques Subjects n=6 performed 25 trials for each torque condition –10 –05 0 +05 and +10 Nm In spite of the variability of individual forces and points of their application stable performance was achieved Individual performance variables were organized into two subsets Variables within each subset highly correlated with each other the coefficients of correlation were close to ±10 while there was no correlation among variables from different subsets The two subsets were associated with two components of the prehension task grasp control preventing an object from slipping out of the hand and torque control maintaining a desired object orientation

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