Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10454573 | Biological Psychology | 2005 | 22 Pages |
Abstract
This study focuses on the relationship between movement-time fluctuations in fine motor tasks and changing levels of muscular co-contraction. Based on a recent neuromotor noise theory, we expected that increased task stress would increase muscular co-contraction and prolong movement times. Ten right-handed adults performed a graphic task, which elicited local movement-time prolongations. In half the trials, a distracting sound was presented as an external stressor. Besides pen-tip kinematics, two estimates of muscular co-contraction were obtained from the surface EMG measurements of eight arm and hand muscles. The results confirm the presumed co-variation of movement time and co-contraction. We conclude that muscular co-contraction forms a strategic means to adapt the flow of motion to central information processing demands.
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Authors
Ruud G.J. Meulenbroek, Gerard P. Van Galen, Majken Hulstijn, Wouter Hulstijn, Gijs Bloemsaat,