The human central nervous system needs time to organize task-specific covariation of finger forces

Jae Kun Shim; Mark L. Latash; Vladimir M. Zatsiorsky

doi:10.1016/j.neulet.2003.08.079

The human central nervous system needs time to organize task-specific covariation of finger forces

Jae Kun Shim, Mark L. Latash, Vladimir M. Zatsiorsky

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34 Scopus citations

Abstract

We studied how the central nervous system (CNS) organizes outputs of effectors in a redundant motor task. During four-finger ramp force production, finger forces show positive covariations across trials at low forces, which turn into negative covariations at a critical force value (F_CR). Subjects performed such tasks with different target amplitudes and durations of the ramp. F_CR showed significant linear relations to the rate of force change. The slopes of the relations varied across subjects corresponding to a critical time (T_CR) ranging from 0.13 to 0.84 s. Across subjects, T_CR showed no relation to maximal force production; T _CR increased with the ramp duration. We conclude that the CNS needs a certain time to organize stabilization of total force by a negative covariation among finger forces.

Original language	English (US)
Pages (from-to)	72-74
Number of pages	3
Journal	Neuroscience letters
Volume	353
Issue number	1
DOIs	https://doi.org/10.1016/j.neulet.2003.08.079
State	Published - Dec 15 2003

All Science Journal Classification (ASJC) codes

Neuroscience(all)

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10.1016/j.neulet.2003.08.079

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title = "The human central nervous system needs time to organize task-specific covariation of finger forces",

abstract = "We studied how the central nervous system (CNS) organizes outputs of effectors in a redundant motor task. During four-finger ramp force production, finger forces show positive covariations across trials at low forces, which turn into negative covariations at a critical force value (FCR). Subjects performed such tasks with different target amplitudes and durations of the ramp. FCR showed significant linear relations to the rate of force change. The slopes of the relations varied across subjects corresponding to a critical time (TCR) ranging from 0.13 to 0.84 s. Across subjects, TCR showed no relation to maximal force production; T CR increased with the ramp duration. We conclude that the CNS needs a certain time to organize stabilization of total force by a negative covariation among finger forces.",

author = "Shim, {Jae Kun} and Latash, {Mark L.} and Zatsiorsky, {Vladimir M.}",

note = "Funding Information: The study was in part supported by NIH grants NS-35032, AG-018751, and AR-048563.",

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T1 - The human central nervous system needs time to organize task-specific covariation of finger forces

AU - Shim, Jae Kun

AU - Latash, Mark L.

AU - Zatsiorsky, Vladimir M.

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N2 - We studied how the central nervous system (CNS) organizes outputs of effectors in a redundant motor task. During four-finger ramp force production, finger forces show positive covariations across trials at low forces, which turn into negative covariations at a critical force value (FCR). Subjects performed such tasks with different target amplitudes and durations of the ramp. FCR showed significant linear relations to the rate of force change. The slopes of the relations varied across subjects corresponding to a critical time (TCR) ranging from 0.13 to 0.84 s. Across subjects, TCR showed no relation to maximal force production; T CR increased with the ramp duration. We conclude that the CNS needs a certain time to organize stabilization of total force by a negative covariation among finger forces.

AB - We studied how the central nervous system (CNS) organizes outputs of effectors in a redundant motor task. During four-finger ramp force production, finger forces show positive covariations across trials at low forces, which turn into negative covariations at a critical force value (FCR). Subjects performed such tasks with different target amplitudes and durations of the ramp. FCR showed significant linear relations to the rate of force change. The slopes of the relations varied across subjects corresponding to a critical time (TCR) ranging from 0.13 to 0.84 s. Across subjects, TCR showed no relation to maximal force production; T CR increased with the ramp duration. We conclude that the CNS needs a certain time to organize stabilization of total force by a negative covariation among finger forces.

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The human central nervous system needs time to organize task-specific covariation of finger forces

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