Reproducibility and variability of the cost functions reconstructed from experimental recordings in multifinger prehension.

Journal of Motor Behavior
Xun NiuVladimir M Zatsiorsky

Abstract

The study examines whether the cost functions reconstructed from experimental recordings are reproducible over time. Participants repeated the trials on three days. By following Analytical Inverse Optimization procedures, the cost functions of finger forces were reconstructed for each day. The cost functions were found to be reproducible over time: application of a cost function C(i) to the data of Day j (i≠j) resulted in smaller deviations from the experimental observations than using other commonly used cost functions. Other findings are: (a) the 2nd order coefficients of the cost function showed negative linear relations with finger force magnitudes; (b) the finger forces were distributed on a 2-dimensional plane in the 4-dimensional finger force space for all subjects and all testing sessions; (c) the data agreed well with the principle of superposition, i.e. the action of object prehension can be decoupled into the control of rotational equilibrium and slipping prevention.

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Citations

Oct 20, 2012·Experimental Brain Research·Y XuV M Zatsiorsky
Aug 15, 2013·Experimental Brain Research·Jaebum ParkMark L Latash
Jun 8, 2013·Journal of Motor Behavior·Joel R MartinVladimir M Zatsiorsky
Dec 8, 2015·IEEE Transactions on Control Systems Technology : a Publication of the IEEE Control Systems Society·M Cody PriessClark Radcliffe
Jun 3, 2016·Journal of Motor Behavior·Behnoosh ParsaMark L Latash
Oct 28, 2016·Experimental Brain Research·Behnoosh ParsaMark L Latash

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Methods Mentioned

BETA
PCA
force measurements

Software Mentioned

ANIO
SPSS
Matlab
LabVIEW

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