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Related Experiment Videos

Diffusive, Synaptic, and Synergetic Coupling: An Evaluation Through In-Phase and Antiphase Rhythmic Movements.

D. Sternad1, E. L. Amazeen, M. T. Turvey

  • 1Department of Kinesiology, College of Health and Human Development, The Pennsylvania State University, 105 White Building, University Park, PA 16803-3903, USA. dxs48@psu.edu

Journal of Motor Behavior
|September 1, 1996
PubMed
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The synergetic model best explains human interlimb coordination dynamics, accurately predicting relative phase and variability during in-phase and antiphase movements. However, all models face challenges in explaining coupled frequency changes.

Area of Science:

  • Biomechanics
  • Neuroscience
  • Dynamical Systems Theory

Background:

  • Interlimb coordination is crucial for complex movements.
  • Understanding the underlying dynamics requires comparing theoretical models with experimental data.
  • Frequency locking, where coupled oscillators synchronize, is a key phenomenon in biological movement.

Purpose of the Study:

  • To contrast in-phase and antiphase frequency locking patterns.
  • To evaluate diffusive, synaptic, and synergetic coupling models of coordination dynamics.
  • To predict and analyze relative phase, standard deviation, and coupled frequency based on eigenfrequency differences.

Main Methods:

  • Human subjects oscillated two handheld pendulums in-phase and antiphase.
  • Pendulum eigenfrequencies were manipulated by altering length and mass.

Related Experiment Videos

  • Relative phase (phi), standard deviation (SDphi), and coupled frequency (omegasubc;) were measured and analyzed relative to eigenfrequency differences (Deltaomega).

    • Main Results:

    • Eigenfrequency differences (|Deltaomega|) displaced relative phase (phi) and amplified variability (SDphi) for both in-phase and antiphase movements.
    • Antiphase movements showed greater displacement of phi and SDphi compared to in-phase.
    • |Deltaomega| decreased the coupled frequency (omegasubc;), which was identical for both coordination modes.
    • The synergetic model demonstrated the highest success in predicting phi and SDphi patterns.

    Conclusions:

    • The synergetic model provides the most accurate framework for understanding observed coordination dynamics.
    • Both in-phase and antiphase coordination exhibit distinct responses to perturbations in eigenfrequency.
    • Further refinement of models is needed to fully account for the relationship between coupled frequency, relative phase, and eigenfrequency differences.