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Related Experiment Video

Updated: May 18, 2026

Experimental Methods to Study Human Postural Control
08:12

Experimental Methods to Study Human Postural Control

Published on: September 11, 2019

Dynamics of inter-modality re-weighting during human postural control.

Paula F Polastri1, José A Barela, Tim Kiemel

  • 1Universidade Estadual Paulista, Bauru, SP, Brazil. paulafp@fc.unesp.br

Experimental Brain Research
|September 12, 2012
PubMed
Summary

Human postural control adapts by re-weighting sensory information. This study found that sensory re-weighting dynamics are complex, varying with stimulus amplitude and potentially absolute gain levels.

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Area of Science:

  • Human postural control
  • Multisensory integration
  • Neuroscience

Background:

  • Flexible postural control relies on adapting to environmental changes by re-weighting multisensory stimuli.
  • Computational models predict reciprocal sensory re-weighting: as one sense is down-weighted, another is up-weighted.

Purpose of the Study:

  • To investigate the dynamics of intra- and inter-modality sensory re-weighting.
  • To examine postural responses to simultaneous manipulation of proprioception and visual stimuli.

Main Methods:

  • Twenty-two young adults stood on a variable-pitch platform in a visual cave.
  • Platform amplitude was switched between low (0.3°) and high (1.5°) degrees at 0.4 Hz.
  • Visual stimulus (0.08° at 0.35 Hz) was presented concurrently.

Main Results:

  • Center of Mass (CoM) responses showed fast and slow reciprocal changes relative to platform amplitude.
  • In the low-to-high condition, CoM response decreased relative to the platform and increased relative to vision.
  • In the high-to-low condition, CoM response relative to vision did not change, suggesting gain-dependency.

Conclusions:

  • Multisensory re-weighting dynamics are more complex than current adaptive models suggest.
  • Re-weighting appears dependent on both the change in stimulus amplitude and its absolute level.
  • Sway variability exhibits a reciprocal relationship with CoM gain relative to the platform.