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Related Experiment Videos

Kinesthetic reference for human orthograde posture

V S Gurfinkel1, Ivanenko YuP, Levik YuS

  • 1Laboratory of Neurobiology of Motor Control, Institute for Information Transmission Problems, Russian Academy of Sciences, Moscow.

Neuroscience
|September 1, 1995
PubMed
Summary
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Human postural control adapts to slow platform tilts, even without vision. The body maintains balance by adjusting to a shifting reference point, indicating complex control mechanisms beyond simple feedback loops.

Area of Science:

  • Biomechanics
  • Human Physiology
  • Neuroscience

Background:

  • Postural control is crucial for stability.
  • Visual, vestibular, and proprioceptive systems contribute to balance.
  • Understanding how the body adapts to slow, subthreshold perturbations is key.

Purpose of the Study:

  • To investigate human postural responses to very slow platform tilts without visual input.
  • To determine the characteristics of body sway and ankle adjustments during these slow perturbations.
  • To explore the underlying control mechanisms of postural adaptation.

Main Methods:

  • Subjects with occluded vision were subjected to slow sinusoidal and ramp tilts of a supporting platform.
  • Measurements included ankle angle and body sway.

Related Experiment Videos

  • Analysis focused on phase shifts and gains relative to platform movement.

    • Main Results:

    • Slow tilts induced significant phase leads in ankle angle and body sway, indicating delayed compensation.
    • Body position slowly approached a new steady state after ramp tilts.
    • High-frequency oscillations superimposed on slow movements suggested ongoing stabilization processes.
    • Postural control operated around a slowly changing reference point.

    Conclusions:

    • The human postural control system exhibits adaptive capabilities to slow perturbations, even without visual cues.
    • A multi-level control system is proposed, involving operative control and a higher level that adjusts the reference point for balance.
    • Energy cost, stability, and security criteria likely influence this adaptive reference point elaboration.