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Related Experiment Videos

Role of visual input in nonlinear postural control system.

Osamu Sasaki1, Shin-ichi Usami, Pierre-Marie Gagey

  • 1Department of Otolaryngology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto 390-8621, Japan. sasaki-o@hsp.md.shinshu-u.ac.jp

Experimental Brain Research
|October 10, 2002
PubMed
Summary

Postural control complexity is maintained with eyes closed, but optokinetic stimulation (OKS) affects balance in some individuals. OKS may decrease stochastic activity for posture correction.

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Area of Science:

  • Human physiology
  • Biophysics
  • Neuroscience

Background:

  • Stabilometry signals exhibit complex, unpredictable patterns.
  • Understanding postural control dynamics under varying visual conditions is crucial.

Purpose of the Study:

  • To investigate postural control system complexity using nonlinear techniques.
  • To examine how altered visual input (eyes open, eyes closed, optokinetic stimulation) affects postural dynamics.

Main Methods:

  • Calculated a similarity index using cross-correlation integrals between different visual conditions.
  • Evaluated dynamical similarities of the postural control system.

Main Results:

  • No significant dynamical changes were observed between eyes-open and eyes-closed conditions.

Related Experiment Videos

  • Optokinetic stimulation (OKS) influenced postural dynamics in approximately half of the subjects (group 2).
  • Group 1 subjects showed no influence from OKS, unlike traditional parameter analyses.

    • Conclusions:

    • Reduced stochastic activity in the eyes-open condition may stem from musculoskeletal stiffness.
    • OKS potentially impacts the dynamics of the visual-vestibular network, decreasing stochastic activity for posture correction in some individuals.