Experimental Brain Research

, Volume 163, Issue 1, pp 44–57 | Cite as

Joint angle variability in 3D bimanual pointing: uncontrolled manifold analysis

  • Dmitry Domkin
  • Jozsef Laczko
  • Mats Djupsjöbacka
  • Slobodan Jaric
  • Mark L. Latash
Research Article

Abstract

The structure of joint angle variability and its changes with practice were investigated using the uncontrolled manifold (UCM) computational approach. Subjects performed fast and accurate bimanual pointing movements in 3D space, trying to match the tip of a pointer, held in the right hand, with the tip of one of three different targets, held in the left hand during a pre-test, several practice sessions and a post-test. The prediction of the UCM approach about the structuring of joint angle variance for selective stabilization of important task variables was tested with respect to selective stabilization of time series of the vectorial distance between the pointer and aimed target tips (bimanual control hypothesis) and with respect to selective stabilization of the endpoint trajectory of each arm (unimanual control hypothesis). The components of the total joint angle variance not affecting (VCOMP) and affecting (VUN) the value of a selected task variable were computed for each 10% of the normalized movement time. The ratio of these two components RV=VCOMP/VUN served as a quantitative index of selective stabilization. Both the bimanual and unimanual control hypotheses were supported, however the RV values for the bimanual hypothesis were significantly higher than those for the unimanual hypothesis applied to the left and right arm both prior to and after practice. This suggests that the CNS stabilizes the relative trajectory of one endpoint with respect to the other more than it stabilizes the trajectories of each of the endpoints in the external space. Practice-associated improvement in both movement speed and accuracy was accompanied by counter-intuitive lack of changes in RV. Both VCOMP and VUN variance components decreased such that their ratio remained constant prior to and after practice. We conclude that the UCM approach offers a unique and under-explored opportunity to track changes in the organization of multi-effector systems with practice and allows quantitative assessment of the degree of stabilization of selected performance variables.

Keywords

Uncontrolled manifold Variability Voluntary movement Coordination Synergy 

Notes

Acknowledgements

The study was supported by grant NS-35032 from the National Institute of Health, USA, grant Nr. 208 from the University of Delaware Research Foundation (UDRF), USA and grants from Stiftelsen för internationalisering av högre utbildning och forskning (STINT), Sweden. The authors also would like to thank two anonymous reviewers for their valuable comments and suggestions.

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Dmitry Domkin
    • 1
    • 2
  • Jozsef Laczko
    • 3
  • Mats Djupsjöbacka
    • 1
  • Slobodan Jaric
    • 4
  • Mark L. Latash
    • 5
  1. 1.Centre for Musculoskeletal ResearchUniversity of GävleUmeåSweden
  2. 2.Department of Surgical and Perioperative Sciences, Sports Medicine UnitUmeå UniversityUmeåSweden
  3. 3.Department of BiomechanicsSemmelweis UniversityBudapestHungary
  4. 4.Department of Health, Nutrition and Exercise SciencesUniversity of DelawareUSA
  5. 5.Department of KinesiologyThe Pennsylvania State UniversityUSA

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