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Sensorimotor performance and computational demand during short-term exposure to microgravity.

Otmar Bock1, Sylvie Abeele, Udo Eversheim

  • 1Institute of Physiology, German Sport University, Köln, Germany. bock@dshs-koeln.de

Aviation, Space, and Environmental Medicine
|December 25, 2003
PubMed
Summary

Human sensorimotor performance significantly declined in microgravity, requiring increased brain resource allocation initially. This adaptation helped subjects maintain performance during parabolic flight experiments.

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Area of Science:

  • Neuroscience
  • Human Physiology
  • Aerospace Medicine

Background:

  • Human sensorimotor performance is influenced by task difficulty and cognitive resource allocation.
  • Understanding these factors is crucial for analyzing performance changes in altered gravity environments.

Purpose of the Study:

  • To investigate sensorimotor performance changes during microgravity episodes.
  • To analyze the role of computational resource allocation in adapting to microgravity.

Main Methods:

  • Seven subjects performed single and dual motor tasks (tracking and reaction time) during parabolic flights.
  • Performance was assessed before, during, and after microgravity exposure.
  • Overall performance scores and dual-task interference were calculated.

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Main Results:

  • Single-task performance decreased by approximately 50% during microgravity.
  • Dual-task interference was more than double the baseline at microgravity onset, converging within 4.5 minutes.
  • Little recovery of sensorimotor performance was observed during the microgravity phase.

Conclusions:

  • Subjects adapted to consistently poor sensorimotor performance in microgravity.
  • An initial increase in computational resource allocation was observed at microgravity onset, suggesting a brief adaptation phase.
  • This increased resource allocation was not necessary after 4.5 minutes of microgravity exposure.