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Matter over mind
Date:7/8/2009

rs either pushing or rubbing a surface--with volunteers conducting the experiment at defined, yet varying, speeds.

Knowing the force-producing properties of muscle, the researchers expected the rubbing motion would show reduced downward force as the speed of motion increased. Surprisingly, whether rubbing slowly or at a pace 36-times faster, speed had little affect on the downward force the volunteers could produce.

Valero-Cuevas and his collaborators--his former students Kevin G. Keenan of the University of Wisconsin/Milwaukee, Veronica J. Santos of Arizona State University, and Madhusudhan Venkadesan of Harvard University--interpret the results to mean the brain is sufficiently occupied by the physical demands of combining motions and forces, so the muscle properties are not the limiting factors for how much force the fingers can create.

"This begins to explain the clinical reality that when something in the system is damaged, either in the brain or body, we can see losses of function," said Valero-Cuevas. "We are not as 'redundant' as we thought."

The study is part of an ongoing NSF Emerging Frontiers in Research and Innovation study to understand how to achieve dexterous, near-optimal control of a hand by having humans and computers perform familiar, challenging tasks. In that effort, researchers will use the same algorithms both to model human motor control and to go beyond the present state-of-the-art in robotic manipulation.

The research team is conducting additional research to determine what exact neural and anatomical mechanisms are producing these results.


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Contact: Joshua A. Chamot
jchamot@nsf.gov
703-292-7730
National Science Foundation
Source:Eurekalert

Page: 1 2

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