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Related Experiment Videos

Nonlinear postural control in response to visual translation.

Elena Ravaioli1, Kelvin S Oie, Tim Kiemel

  • 1Department of Kinesiology, University of Maryland, College Park, MD 20742-2611, USA.

Experimental Brain Research
|October 14, 2004
PubMed
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Human postural control uses nonlinear sensory fusion. This study shows visual integration stabilizes sway, with nonlinear responses suggesting multiple mechanisms for upright stance control.

Area of Science:

  • Human motor control
  • Systems neuroscience
  • Biomechanics

Background:

  • Human postural control models emphasize nonlinear sensory integration.
  • Existing models require more experimental data to define nonlinear properties.

Purpose of the Study:

  • Investigate nonlinearities in visual-information integration for postural control.
  • Determine if new mechanisms are needed for vision-based sway stabilization.

Main Methods:

  • Subjects experienced visual displays with oscillation and varying translation velocities.
  • Postural sway variability and gain were measured across different visual motion conditions.

Main Results:

  • Postural sway variability increased with visual translation velocity but remained below eyes-closed levels.

Related Experiment Videos

  • Postural control gain showed nonlinear changes, increasing then decreasing with translation velocity.
  • System demonstrated ability to differentiate environmental and self-motion at low velocities.

    • Conclusions:

    • Human postural control exhibits nonlinearities in visual sensory fusion.
    • Multiple mechanisms may be necessary to model the complex integration of visual information for upright stance.
    • Findings provide constraints for future human postural control models.