The Influence of Recent Actions and Anticipated Actions on the Stability of Finger Forces During a Tracking Task

The authors examined how the stability of the current total isometric force ( F T ) produced by four fingers is influenced by previous and expected voluntary changes in F T . The authors employed the synergy index obtained from the across-trial uncontrolled manifold analysis to quantify the stabilit...

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Bibliographic Details
Published in:Motor control 2020-07, Vol.24 (3), p.365-382
Main Authors: Tillman, Mitchell, Ambike, Satyajit
Format: Article
Language:English
Subjects:
Fingers & toes
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Summary:The authors examined how the stability of the current total isometric force ( F T ) produced by four fingers is influenced by previous and expected voluntary changes in F T . The authors employed the synergy index obtained from the across-trial uncontrolled manifold analysis to quantify the stability of F T . The authors compared two tasks with similar histories of F T changes; one in which participants expected changes in F T in the future, and one in which they expected no changes in F T . The stability of F T was lower in the former task, indicating the existence of a novel type of anticipatory synergy adjustment. Disparate histories of F T changes yield inconsistent changes in stability, driven by individual differences in the covariation in the finger forces that leave F T invariant. Future research should focus on exploring these individual differences to better understand how previous and expected behavior changes influence the stability of the current motor behavior.
ISSN:1087-1640
1543-2696
DOI:10.1123/mc.2019-0124