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Vestibular function and sensory interaction in space flight

L N Kornilova1, V Grigorova, G Bodo

  • 1Institute for Biomedical Problems, Moscow, Russia.

Journal of Vestibular Research : Equilibrium & Orientation
|January 1, 1993
PubMed
Summary
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Astronauts experienced changes in their vestibular system and vision during spaceflight. Initial overactivity shifted to reduced vestibular function and increased reliance on visual input for eye movements.

Area of Science:

  • Neuroscience
  • Space Physiology
  • Oculomotor Function

Background:

  • The vestibular system is crucial for spatial orientation and balance.
  • Spaceflight significantly impacts sensory systems, including vestibular and visual.
  • Understanding vestibulo-visual interactions is key to astronaut adaptation.

Purpose of the Study:

  • To investigate changes in the vestibular system and vestibulo-visual interaction in astronauts.
  • To analyze oculomotor responses during short- and long-term spaceflights.
  • To determine adaptive processes in sensory systems under weightlessness.

Main Methods:

  • Electrooculography (EOG) was used to examine 11 astronauts.
  • Data collected during short- and long-term spaceflights on specific days.

Related Experiment Videos

  • Experiments included OPTOKINES and LABYRINTH, assessing responses to stimuli and head movements.

    • Main Results:

    • Early spaceflight (days 2-3) showed enhanced spontaneous vertical nystagmus and impaired tracking.
    • Vestibular function initially increased, then reduced, with greater reliance on visual input by day 5.
    • Oculomotor responses demonstrated both general sensory adaptation and specific adaptive processes to weightlessness.

    Conclusions:

    • Spaceflight induces significant, dynamic changes in vestibular and visual systems.
    • Adaptation involves a shift from vestibular dominance to visual input for oculomotor control.
    • These findings highlight the complex integration and adaptation of sensory systems in microgravity.