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Discrete and cyclical movements: unified dynamics or separate control?

Anke M van Mourik1, Peter J Beek

  • 1Institute for Fundamental and Clinical Human Movement Sciences, Free University, Amsterdam, The Netherlands. a.vanmourik@fbw.vu.nl

Acta Psychologica
|October 7, 2004
PubMed
Summary

Discrete and cyclical movements are distinct motor primitives, not reducible to each other. Analysis of reaching movements revealed significant kinematic differences, challenging existing motor control theories.

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Area of Science:

  • Motor control
  • Biomechanics
  • Movement science

Background:

  • The relationship between discrete and cyclical movements in motor control is debated.
  • Three perspectives exist: cyclical as concatenated discrete, discrete as a limiting case of cyclical, or both as irreducible primitives.

Purpose of the Study:

  • To investigate the tenability of different theoretical perspectives on the relationship between discrete and cyclical movements.
  • To analyze kinematic properties of discrete and cyclical reaching movements.

Main Methods:

  • 16 participants performed discrete and cyclical reaching movements of varying amplitudes towards different target sizes.
  • Kinematic properties of recorded movements were analyzed and compared.

Main Results:

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  • Cyclical movements showed distinct kinematic properties, particularly in their symmetry ratio, compared to discrete movements.
  • These differences persisted regardless of movement amplitude, target size, or direction (flexion-extension).
  • The findings ruled out the perspective that cyclical movements are simply concatenated discrete movements.

Conclusions:

  • Discrete and cyclical movements appear to be fundamentally different, supporting the idea of irreducible motor primitives.
  • Current dynamical models under the limiting case or irreducible primitives perspectives do not fully explain the observed kinematic features.
  • Future research should focus on modeling the initiation and abortion dynamics of both movement types.