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Individual preferences in motor coordination seen across the two hands: relations to movement stability and optimality

  • Paulo B. de Freitas
  • Sandra M. S. F. Freitas
  • Mechelle M. Lewis
  • Xuemei Huang
  • Mark L. Latash
Research Article
  • 48 Downloads

Abstract

The framework of the uncontrolled manifold (UCM) hypothesis was used to explore variables related to stability of task performance in the two hands of young healthy individuals. Fourteen young adults performed four-finger accurate constant force production tasks interrupted by a voluntary quick force pulse production and by an externally imposed displacement of all fingers. Three groups of variables were used to quantify stability of steady force production: (1) indices of the inter-trial variance were computed within the UCM and orthogonal to the UCM; (2) indices of motor equivalence were computed between steady-state intervals separated by the force pulse and by the finger-lifting episode; and (3) referent coordinate and apparent stiffness were computed using the data during the ascending phase of the finger-lifting episode. In another task, the subjects performed accurate constant force production with visual feedback removal after the 8th second, and the drop in the total force after the removal was computed. There were differences between the right and left hand in some outcome variables such as variance within the UCM, and the timing of anticipatory synergy adjustments prior to the force pulse, consistent with the dynamic dominance hypothesis. There were significant correlations between the two hands for indices that were unrelated to accuracy of performance: variance within the UCM, index of motor equivalence, referent coordinate, apparent stiffness, and the drop of total force after visual feedback removal. We interpret these findings within the concept of stability–optimality trade-off. In particular, we conclude that individual subjects select particular, person-specific solutions within the spectrum allowed by the explicit task constraints, and this choice is consistent between the two hands. We conclude with a hypothesis that selecting specific solutions within the stability–optimality trade-off may represent an individual’s personal preference consistent between the two hands.

Keywords

Hand Synergy Variance Motor equivalence Referent coordinate 

Notes

Acknowledgements

The study was in part supported by NIH Grants NS082151 and NS095873.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Paulo B. de Freitas
    • 1
    • 2
    • 3
  • Sandra M. S. F. Freitas
    • 2
    • 3
    • 4
  • Mechelle M. Lewis
    • 3
    • 5
  • Xuemei Huang
    • 3
    • 5
    • 6
    • 7
  • Mark L. Latash
    • 2
  1. 1.Interdisciplinary Graduate Program in Health SciencesCruzeiro do Sul UniversitySão PauloBrazil
  2. 2.Department of Kinesiology, Rec.Hall-267The Pennsylvania State UniversityUniversity ParkUSA
  3. 3.Department of Neurology, Milton S. Hershey Medical CenterThe Pennsylvania State UniversityHersheyUSA
  4. 4.Graduate Program in Physical TherapyThe City University of São PauloSão PauloBrazil
  5. 5.Department of Pharmacology, Milton S. Hershey Medical CenterThe Pennsylvania State UniversityHersheyUSA
  6. 6.Department of Radiology, Milton S. Hershey Medical CenterThe Pennsylvania State UniversityHersheyUSA
  7. 7.Department of Neurosurgery, Milton S. Hershey Medical CenterThe Pennsylvania State UniversityHersheyUSA

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