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Do equilibrium constraints modulate postural reaction when viewing imbalance?

Banty Tia1, Christos Paizis, France Mourey

  • 1INSERM U1093, Cognition, Action et Plasticité Sensorimotrice, Université de Bourgogne, Campus Universitaire, BP 27877, 21078 Dijon, France. banty.tia@u-bourgogne.fr

Brain and Cognition
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PubMed
Summary
This summary is machine-generated.

Observing postural imbalance contagiously increases body sway, especially when the visual stimulus aligns with the observer's primary stabilization strategy. This finding has implications for rehabilitation training devices.

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Human Motor Control

Background:

  • Action observation and execution are closely linked, influencing behavior.
  • Observing postural instability increases body sway in observers.

Purpose of the Study:

  • To investigate the role of observers' motor system in postural contagion.
  • To compare body sway responses to antero-posterior (A-P) versus lateral (M-L) imbalance stimuli.

Main Methods:

  • Participants stood upright and observed video displays of models exhibiting A-P or M-L postural imbalance.
  • Center of Pressure (CoP) displacement was measured to quantify body sway.
  • CoP displacements were normalized against a fixation cross control condition.

Main Results:

  • Greater CoP displacement area was observed when viewing A-P imbalance compared to M-L imbalance.
  • Normalized A-P CoP path length tended to be higher than M-L CoP path length when viewing corresponding imbalances.
  • Postural contagion is enhanced when observed imbalance matches the observer's dominant A-P stabilization strategy.

Conclusions:

  • Observer's motor system and biomechanical constraints influence postural contagion.
  • Postural contagion is stronger for stimuli aligned with the primary A-P stabilization strategy.
  • Findings suggest adaptations for observational training devices in rehabilitation programs.