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Related Experiment Videos

Feedback equilibrium control during human standing.

A V Alexandrov1, A A Frolov, F B Horak

  • 1Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Science, Butlerova 5a, Moscow 117485, Russia. alexeialexandrov@inbox.ru

Biological Cybernetics
|October 18, 2005
PubMed
Summary
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Human equilibrium during standing is maintained by independent feedback control of specific body movements called eigenmovements. This control system, acting like a delayed spring, ensures stability against unexpected disturbances.

Area of Science:

  • Biomechanics
  • Human motor control
  • Systems neuroscience

Background:

  • Maintaining upright stance requires continuous postural adjustments.
  • Previous research suggests independent control of specific movement patterns.

Purpose of the Study:

  • To investigate the control mechanisms of human equilibrium during standing.
  • To analyze postural responses to sudden support surface perturbations.

Main Methods:

  • Utilized a 3-joint (ankle, knee, hip) sagittal model of body movement.
  • Applied sudden backward displacements of the support platform during quiet stance.
  • Analyzed experimental data using eigenvectors of motion equations.

Main Results:

Related Experiment Videos

  • Human postural responses to stance perturbations are adequately described by independent feedback control of eigenmovements.
  • Independent feedback control of each eigenmovement is sufficient for stability.
  • The feedback loop for each eigenmovement can be modeled as a delayed linear visco-elastic spring.

    • Conclusions:

    • Eigenmovements represent fundamental units of postural control.
    • Stability is achieved through independent feedback loops regulating these eigenmovements.
    • Visco-elastic parameters and time delays arise from passive and sensory contributions.