TY - JOUR
T1 - Prehension synergies
T2 - Trial-to-trial variability and hierarchical organization of stable performance
AU - Shim, Jae K.
AU - Latash, Mark L.
AU - Zatsiorsky, Vladimir M.
N1 - Funding Information:
Acknowledgments The study was in part supported by NIH grants NS-35032, AG-018751, and AR-048563. The authors are thankful to T. Pataky for help in editing the manuscript.
PY - 2003/9
Y1 - 2003/9
N2 - We studied multi-digit 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 (14.9 N) against different external torques. Subjects (n=6) performed 25 trials for each torque condition: -1.0, -0.5, 0, +0.5 and +1.0 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 ±1.0) 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).
AB - We studied multi-digit 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 (14.9 N) against different external torques. Subjects (n=6) performed 25 trials for each torque condition: -1.0, -0.5, 0, +0.5 and +1.0 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 ±1.0) 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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U2 - 10.1007/s00221-003-1527-0
DO - 10.1007/s00221-003-1527-0
M3 - Article
C2 - 12898101
AN - SCOPUS:0141788225
SN - 0014-4819
VL - 152
SP - 173
EP - 184
JO - Experimental Brain Research
JF - Experimental Brain Research
IS - 2
ER -