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Changes in monkey horizontal semicircular canal afferent responses after spaceflight.

M J Correia1, A A Perachio, J D Dickman

  • 1Department of Otolaryngology, University of Texas Medical Branch, Galveston 77550.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|August 1, 1992
PubMed
Summary

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Spaceflight temporarily alters vestibular function. Semicircular canal afferent responses showed increased gain and adaptation after a 14-day mission, suggesting microgravity impacts the balance system.

Area of Science:

  • Neuroscience
  • Space Biology
  • Vestibular System Research

Background:

  • The vestibular system, responsible for balance and spatial orientation, is sensitive to microgravity.
  • Understanding how prolonged spaceflight affects vestibular afferent function is crucial for astronaut health and future missions.

Purpose of the Study:

  • To investigate changes in horizontal semicircular canal afferent responses after a 14-day spaceflight.
  • To determine if microgravity exposure induces transient modifications in vestibular end-organ function.

Main Methods:

  • Extracellular recordings of single horizontal semicircular canal afferents in rhesus monkeys.
  • Testing responses to passive yaw rotation waveforms preflight and postflight (day 1) after a 14-day orbital mission (COSMOS 2044).
Keywords:
NASA Discipline NeuroscienceNon-NASA Center

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Main Results:

  • Mean afferent response gain was nearly doubled on postflight day 1 compared to preflight controls.
  • Increased adaptation of afferent responses to passive yaw rotation was observed postflight.

Conclusions:

  • A 14-day spaceflight transiently modifies semicircular canal afferent function, indicated by increased gain and adaptation.
  • These changes suggest potential plasticity within the vestibular end organ itself, possibly influenced by central nervous system efferent connections, challenging previous assumptions about central plasticity only.