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Motor timing under microgravity.

A Semjen1, G Leone, M Lipshits

  • 1Centre Nationale de la Recherche Scientifique, Centre de Recherche en Neurosciences Cognitives, Marseille. Semjen@lnf.cnrs-mrs.fr

Acta Astronautica
|September 7, 2001
PubMed
Summary
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Astronauts on the CASSIOPEE 96 mission showed less accurate and more variable timing for fast movements in space. This timing variability was linked to internal timekeeping, not motor execution, during spaceflight.

Area of Science:

  • Human physiology
  • Spaceflight research
  • Motor control

Background:

  • Accurate and regular inter-response intervals are crucial for motor control.
  • Spaceflight environments may impact human physiological functions, including timing abilities.

Purpose of the Study:

  • To assess the accuracy and regularity of inter-response intervals in astronauts during spaceflight.
  • To investigate the underlying mechanisms of timing changes in microgravity.

Main Methods:

  • Five participants, including three astronauts from the CASSIOPEE 96 mission and two ground controls, performed timing tasks.
  • Inter-response intervals were measured in the 350-530 ms range.

Main Results:

  • Spaceflight led to undershot inter-response intervals and increased timing variability.

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  • Timing variability was primarily attributed to internal timekeeping processes, not motor execution.

    • Conclusions:

    • Microgravity affects the internal timekeeping mechanisms responsible for precise motor timing.
    • Further research into physiological mechanisms underlying timing in fast serial movements during spaceflight is warranted.