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Related Experiment Video

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Experimental Methods to Study Human Postural Control
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Vision Does Not Necessarily Stabilize the Head in Space During Continuous Postural Perturbations.

Stefania Sozzi1, Antonio Nardone2, Marco Schieppati1

  • 1Centro Studi Attività Motorie, Istituti Clinici Scientifici Maugeri IRCCS, Pavia, Italy.

Frontiers in Neurology
|July 30, 2019
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Summary

Vision does not stabilize the head during balance tasks when a precise visual task is performed. Head stabilization can be overridden by the central nervous system for non-postural tasks, impacting balance control.

Keywords:
balancehead stabilizationmotor controlrehabilitationvision

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Human Motor Control

Background:

  • Vision typically aids in stabilizing the head during postural perturbations.
  • This head stabilization is crucial for maintaining balance and providing an inertial reference.

Purpose of the Study:

  • To investigate if head oscillations increase during a precision visual task while standing on a translating platform.
  • To test if concurrent visual tasks can override the typical head stabilization effect of vision.

Main Methods:

  • Participants stood on a platform with sinusoidal antero-posterior translations at 0.2 and 0.6 Hz.
  • Head oscillations were measured under four conditions: eyes open (no task), eyes open with a visual task on a moving platform, eyes open with a visual task on a stationary platform, and eyes closed.
  • Optoelectronic motion capture tracked markers on the head, platform, and text.

Main Results:

  • Head oscillations were significantly larger with eyes closed compared to all eyes open conditions.
  • Head oscillations were minimal with eyes open (no task) and eyes open with a stationary visual task.
  • Head oscillations were intermediate when performing a visual task on the moving platform.

Conclusions:

  • Vision does not stabilize the head when a concurrent precision visual task on a moving surface is performed.
  • The central nervous system can suppress head stabilization to prioritize non-postural tasks, challenging traditional views of vision's role in balance.
  • This finding offers potential insights for therapeutic interventions to improve multisensory integration in individuals with balance disorders.