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Motor control, excitement, and overarm throwing

J Hore1

  • 1Physiology Department, University of Western Ontario, London, Canada.

Canadian Journal of Physiology and Pharmacology
|April 1, 1996
PubMed
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Inaccuracies in overarm throws are not caused by joint rotation errors but by variability in finger opening timing. This finding offers new insights into motor control and human movement accuracy.

Area of Science:

  • Neuroscience
  • Motor Control
  • Biomechanics

Background:

  • Motor control is a foundational neuroscience discipline facing challenges from newer fields.
  • There is a need to re-engage interest in motor control through clear communication and applied contexts.
  • Recent advances focus on analyzing natural, three-dimensional, multijoint movements.

Purpose of the Study:

  • To investigate the causes of inaccuracy in overarm throwing.
  • To determine if timing or velocity errors in joint rotations contribute to inaccurate hand trajectories.
  • To identify the specific kinematic factors leading to inconsistent throwing performance.

Main Methods:

  • Analysis of three-dimensional, multijoint movements, specifically overarm throwing.
  • Kinematic analysis to assess joint rotations and hand trajectory.

Related Experiment Videos

  • Comparison of factors contributing to accurate versus inaccurate throws.

    • Main Results:

    • Inaccuracies in overarm throws (e.g., high/low throws) are not primarily due to errors in proximal joint rotations.
    • Variability in the timing of the onset of finger opening is identified as a key factor causing throwing inaccuracies.
    • The study differentiates between joint coordination and terminal effects on accuracy.

    Conclusions:

    • The timing of finger opening, not proximal joint kinematics, is a critical determinant of overarm throwing accuracy.
    • This finding shifts the focus towards more distal aspects of motor control in complex movements.
    • Further research is needed to understand the impact of cerebellar dysfunction on this specific error mechanism in throwing.