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Practicing elements versus practicing coordination: changes in the structure of variance.

Yen-Hsun Wu1, Nemanja Pazin, Vladimir M Zatsiorsky

  • 1Department of Kinesiology , Pennsylvania State University, University Park, PA 16802, USA.

Journal of Motor Behavior
|December 15, 2012
PubMed
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Practicing finger force control with single fingers or multiple fingers improved performance similarly. However, multi-finger practice uniquely enhanced motor control by increasing variance within the uncontrolled manifold (V(UCM)).

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Area of Science:

  • Motor control
  • Motor learning
  • Biomechanics

Background:

  • The uncontrolled manifold (UCM) hypothesis explains how motor systems manage redundant degrees of freedom to stabilize task-relevant variables while allowing variability in others.
  • Understanding how practice influences the structure of motor variability is crucial for optimizing motor skill acquisition and rehabilitation.

Purpose of the Study:

  • To investigate the effects of practicing a 2-finger accurate force production task on components of finger force variance.
  • To compare the impact of practicing single fingers versus practicing two fingers simultaneously on motor variability and performance.
  • To examine the retention of practice-related changes in motor variability.

Main Methods:

  • Two groups of participants practiced a 2-finger force production task with graded instability.
  • Group 1 practiced one finger at a time; Group 2 practiced two fingers together.
  • Finger force variance was analyzed using the UCM hypothesis, specifically V(UCM) (variance stabilized) and V(ORT) (variance affecting total force).
  • Testing occurred before practice, immediately after, and during a retention test two weeks later.

Main Results:

  • Both practice conditions led to comparable improvements in overall force production performance.
  • Both groups demonstrated a decrease in V(ORT) (variability affecting total force).
  • Only the group practicing two fingers together showed an increase in V(UCM) (stabilized variance).
  • These changes in motor variability were retained two weeks after practice.

Conclusions:

  • Practicing individual components versus practicing redundant groups can yield similar performance gains but distinct changes in motor variability structure.
  • Simultaneous practice of redundant finger synergies may be more effective in restructuring motor variability, potentially by increasing the flexibility of the motor system.
  • The observed retention effects suggest potential applications for these practice paradigms in motor rehabilitation settings.