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Validity of visual stabilization conditions used with computerized dynamic platform posturography

R P Di Fabio1, A Emasithi, S Paul

  • 1Department of Physical Medicine and Rehabilitation, University of Minnesota, Minneapolis 55455, USA. difab001@maroon.tc.umn.edu

Acta Oto-Laryngologica
|September 3, 1998
PubMed
Summary

Visual stabilization during sensory organization testing (SOT) was inconsistent. Head movements led visual surround motion, challenging the inverted pendulum model for posture control in computerized dynamic platform posturography (CDP).

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Area of Science:

  • Biomechanics
  • Neuroscience
  • Human Movement Science

Background:

  • Computerized dynamic platform posturography (CDP) is used to assess balance.
  • The Sensory Organization Test (SOT) within CDP evaluates how individuals use sensory information for postural control.
  • Visual stabilization is a key assumption in interpreting SOT results, particularly in conditions 3 and 6.

Purpose of the Study:

  • To evaluate the temporal and spatial relationships between head motion and visual surround movement during SOT conditions 3 and 6.
  • To determine the validity of visual stabilization during CDP.
  • To assess if the inverted pendulum model applies to voluntary sway corrections in SOT.

Main Methods:

  • Seven healthy subjects underwent SOT conditions 3 and 6.

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  • Sagittal head translation and head pitch were measured relative to the visual surround's displacement.
  • Correlation and phase analysis were used to quantify head-surround motion relationships.

    • Main Results:

    • High correlations were found between sagittal head motion and surround tilt (r=0.68 for C3, r=0.93 for C6).
    • Head movements consistently led visual surround motion, indicating a lack of visual stabilization (e.g., +452 ms for C3 sagittal).
    • Head pitch showed moderate negative correlations and also led surround motion with greater variability.

    Conclusions:

    • Visual stabilization is not consistently achieved in SOT conditions 3 and 6.
    • The assumption of posture as an inverted pendulum controlled by lower extremities may not apply to voluntary sway corrections in SOT.
    • These findings question the interpretation of visual input in certain CDP posturography conditions.