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Updated: Sep 20, 2025

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Sinusoidal Optic Flow Perturbations Reduce Transient but Not Continuous Postural Stability: A Virtual Reality-Based

Jakob Ketterer1, Steffen Ringhof1, Dominic Gehring1

  • 1Department of Sport and Sport Science, University of Freiburg, Freiburg, Germany.

Frontiers in Physiology
|June 6, 2022
PubMed
Summary
This summary is machine-generated.

Continuous virtual reality (VR) optic flow perturbations do not sustainably challenge balance control. The postural system adapts quickly, reducing the impact of sensory conflicts after the initial perturbation cycle.

Keywords:
optic flow perturbationpostural controlsensory conflictssensory reweightingvirtual reality

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Area of Science:

  • Neuroscience
  • Rehabilitation Science
  • Biomechanics

Background:

  • Virtual reality (VR) is used in rehabilitation to improve postural control and gait by decoupling sensory systems.
  • VR allows training with conflicting sensorimotor stimulation, demanding sensory reweighting and enhanced balance control.
  • Current VR interventions lack standardized metrics for repeatable optic flow perturbations to challenge balance.

Purpose of the Study:

  • To investigate if continuous optic flow perturbations can sustainably challenge the postural system.
  • To determine the effectiveness of continuous sinusoidal visual scene oscillations in VR for balance training.

Main Methods:

  • Eighteen young adults participated in the study.
  • Participants stood bipedally while their virtual reality environment underwent sinusoidal rotations in the sagittal plane (8° amplitude, 0.2 Hz frequency).
  • Postural stability was measured using center of mass speed derived from 3D kinematics.

Main Results:

  • Increased postural instability was observed only during the first perturbation cycle (first 5 seconds).
  • The postural system downregulated visual afferents after the initial cycle, reducing the destabilizing effect of sensory conflicts.
  • Continuous sinusoidal optic flow perturbations did not induce persistent sensory conflicts.

Conclusions:

  • Continuous sinusoidal optic flow perturbations are not suitable for sustainable balance training.
  • The transient initial phase of oscillations, not the continuous nature, impacts balance.
  • Unexpected and discrete optic flow perturbations are recommended for inducing sustainable sensory conflicts in rehabilitation.