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Related Experiment Videos

Visually induced vertical self-motion sensation is altered in microgravity adaptation

C Mueller1, L Kornilova, G Wiest

  • 1University Clinic of Neurology, Vienna, Austria.

Journal of Vestibular Research : Equilibrium & Orientation
|March 1, 1994
PubMed
Summary

Astronauts experienced reversed vertical vection, a self-motion illusion, during and after spaceflight. This suggests microgravity alters visual processing for orientation, even during readaptation to Earth's gravity.

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Area of Science:

  • Neuroscience
  • Space Physiology
  • Human Perception

Background:

  • Vertical vection describes the perception of self-motion (up or down) in response to visual stimuli.
  • Typically, vection is perceived in the direction opposite to the visual stimulus's movement.
  • Spaceflight is known to alter sensory-motor functions and perception.

Purpose of the Study:

  • To investigate the effects of spaceflight on vertical vection perception.
  • To determine if altered visual processing modes persist after readaptation to Earth's gravity.

Main Methods:

  • A scientific cosmonaut was exposed to sinusoidal and constant velocity visual stimuli during and after spaceflight.
  • Vertical vection perception was recorded and analyzed.

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Main Results:

  • Reversed vertical vection was observed on days 3 and 6 of spaceflight, and immediately postflight.
  • Short periods of reversed vection were also noted six months postflight, indicating a potential reactivation of an alternative processing mode.

Conclusions:

  • Microgravity significantly modulates neuronal pathways involved in visual processing for dynamic orientation.
  • These modulations may not be entirely extinguished during readaptation to 1-G, suggesting long-term effects on visual-spatial perception.