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Video-oculography in Mice
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Multi-segment phase coupling to oscillatory visual drive.

David Engel1, Jakob C B Schwenk1, Adrian Schütz1

  • 1Department of Neurophysics, University of Marburg, Marburg, Germany; Center for Mind, Brain and Behavior (CMBB), University of Marburg and Justus-Liebig-University, Gießen, Germany.

Gait & Posture
|March 15, 2021
PubMed
Summary
This summary is machine-generated.

Humans adapt their body sway to visual motion, with body segments showing frequency-dependent phase locking. At higher frequencies, postural responses concentrate around the lower torso and hips, offering insights into balance control.

Keywords:
Body swayCOPMotion trackingPhase couplingPostural responseVisuomotor control

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Area of Science:

  • Biomechanics
  • Human Movement Science
  • Neuroscience

Background:

  • Humans adapt postural sway to simulated self-motion.
  • Individual body segment contributions to postural sway adjustments are not well understood.
  • Variability in postural response across different environmental conditions remains unclear.

Purpose of the Study:

  • To investigate how the center of pressure (COP) and individual body segments phase-lock to visual stimuli at different frequencies.
  • To assess the influence of stimulation frequency on postural response patterns.
  • To introduce phase coupling as a method for analyzing full body motion in response to virtual reality (VR) visual stimuli.

Main Methods:

  • 12 participants stood in a VR tunnel oscillating sinusoidally in the anterior-posterior direction.
  • Stimulation frequencies tested were 0.2 Hz, 0.8 Hz, and 1.2 Hz.
  • Motion tracking captured COP trajectories and 25 body segments.

Main Results:

  • Significant phase coupling of COP and body segments to the visual drive was observed across all frequencies.
  • Body segment phase coupling shifted with frequency: strong and uniform at 0.2 Hz.
  • At 0.8 Hz and 1.2 Hz, phase coupling weakened and localized to the lower torso and hip.

Conclusions:

  • Visual perception of self-motion significantly influences balance control.
  • Phase coupling analysis provides a reliable method for assessing perturbed balance.
  • Findings are relevant for understanding visuomotor processing in health and disease and for clinical applications.