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Related Experiment Videos

Posturally induced transitions in rhythmic multijoint limb movements

J J Buchanan1, J A Kelso

  • 1Program in Complex Systems and Brain Sciences, Center for Complex Systems, Florida Atlantic University, Boca Raton 33431.

Experimental Brain Research
|January 1, 1993
PubMed
Summary
This summary is machine-generated.

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Forearm rotation influences multijoint arm movement coordination. Critical angles for switching between in-phase and anti-phase coordination patterns were observed, demonstrating hysteresis and critical slowing down.

Area of Science:

  • Motor control
  • Biomechanics
  • Human movement science

Background:

  • Understanding the coordination dynamics of multijoint arm movements is crucial for motor control research.
  • Forearm rotation significantly impacts the stability and switching of coordinated movements.

Purpose of the Study:

  • To investigate the coordination dynamics of multijoint arm movements as a function of forearm rotation.
  • To examine the transition between in-phase and anti-phase coordination patterns during rhythmic elbow and wrist movements.

Main Methods:

  • Subjects performed rhythmic flexion and extension of the elbow and wrist under supine (in-phase) and prone (anti-phase) forearm conditions.
  • Forearm angle was systematically rotated in 20-degree steps, with 15 cycles of motion at 1.25 Hz per step.

Related Experiment Videos

  • Spontaneous transitions between coordination patterns were recorded, and phase fluctuations and perturbation response times were analyzed.

    • Main Results:

    • Spontaneous transitions between in-phase and anti-phase coordination patterns occurred at critical forearm angles.
    • The critical angle for pattern switching exhibited hysteresis, depending on the direction of forearm rotation.
    • Enhanced phase fluctuations and increased perturbation response times (critical slowing down) were observed near the transition points.

    Conclusions:

    • Loss of stability is a key self-organizing process underlying changes in multijoint coordination.
    • The observed hysteresis and critical slowing down support a dynamic systems approach to understanding motor control.
    • Neurophysiological mechanisms governing multijoint coordination dynamics warrant further investigation.