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Objects Mental Rotation under 7 Days Simulated Weightlessness Condition: An ERP Study.

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Simulated weightlessness affects astronauts' mental rotation ability, showing initial adaptation patterns in brain activity. Cognitive performance did not fully recover post-simulation, impacting spaceflight safety.

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Area of Science:

  • Neuroscience
  • Human physiology
  • Space medicine

Background:

  • Spaceflight alters physiological conditions, including fluid shifts to the head.
  • These changes can impact astronaut brain function and performance.
  • Maintaining cognitive abilities is crucial for spaceflight safety.

Purpose of the Study:

  • To investigate the effects of simulated weightlessness on mental rotation (MR) ability.
  • To analyze behavioral and electrophysiological changes during simulated weightlessness.
  • To understand the neural mechanisms of adaptation to altered gravity.

Main Methods:

  • Utilized a 7-day head-down tilted (HDT) bed rest model to simulate weightlessness.
  • Employed 20 male subjects, assessing MR ability using behavioral and electrophysiological techniques.
  • Measured P300 brainwave component changes during object mental rotation tasks.

Main Results:

  • A linear relationship between stimulus rotation angle and reaction time confirmed MR processes under simulated weightlessness.
  • The P300 component exhibited a "down-up-down" pattern in the initial 3 days, then became random.
  • P300 amplitude showed a dip on day 2, with gradual increase by day 3, but no clear pattern thereafter.

Conclusions:

  • Simulated weightlessness does not alter the fundamental process of mental rotation.
  • Observed changes suggest a neural self-adaptation mechanism to simulated weightlessness.
  • Mental rotation ability did not fully recover to baseline levels after the HDT period.