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Related Experiment Videos

Postural coordination modes considered as emergent phenomena.

B G Bardy1, L Marin, T A Stoffregen

  • 1University of the Mediterranean, Marseille, France. benoit.bardy@staps.u-psud.fr

Journal of Experimental Psychology. Human Perception and Performance
|October 26, 1999
PubMed
Summary

This study explored how the torso and legs coordinate to maintain balance during complex tasks. Two main coordination modes, in-phase and anti-phase, were identified, demonstrating adaptive postural control.

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Area of Science:

  • Motor Control
  • Biomechanics
  • Dynamical Systems Theory

Background:

  • Maintaining upright standing posture involves complex coordination of multiple body segments.
  • Dynamical theories suggest that motor coordination can emerge from the interaction of system components.

Purpose of the Study:

  • To investigate the coordination of torso and leg segments during a suprapostural task.
  • To determine if relative phase of joint rotations describes multisegment postural coordination.
  • To examine how task constraints influence emergent coordination modes.

Main Methods:

  • Two experiments were conducted involving a suprapostural task (visual tracking).
  • Varied parameters included foot length, center of mass height, and head motion amplitude.

Related Experiment Videos

  • Analysis focused on the relative phase of rotations around the hip and ankle joints.

    • Main Results:

    • Multisegment postural coordination was effectively described by the relative phase of hip and ankle rotations.
    • Two primary coordination modes were observed: in-phase and anti-phase.
    • The suprapostural task constraints influenced the emergence of these coordination modes.

    Conclusions:

    • Postural coordination modes can emerge adaptively in response to task demands.
    • A dynamical systems approach provides a framework for understanding emergent postural coordination.
    • The findings support the role of task constraints in shaping motor control strategies.