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Perceived head-trunk angle during microgravity produced by parabolic flight.

Hadrien Ceyte1, Marion Trousselard, Pierre-Alain Barraud

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Aviation, Space, and Environmental Medicine
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Summary
This summary is machine-generated.

In microgravity, neck proprioception accurately senses head-trunk orientation. However, visual perception of egocentric coordinates is altered, showing gravity

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Area of Science:

  • Neuroscience
  • Human Physiology
  • Space Biology

Background:

  • Neck proprioceptors are crucial for head-trunk orientation.
  • Gravity provides essential orientation cues, absent in microgravity.
  • Otoliths and inertial graviceptors are compromised in weightlessness.

Purpose of the Study:

  • To investigate human accuracy in locating head position relative to the trunk during microgravity.
  • To assess the role of neck proprioception in spatial orientation without gravitational input.

Main Methods:

  • Experiments conducted on Earth and during parabolic flights.
  • Participants adjusted a visual rod to align with head or trunk axes.
  • Two configurations tested: head-trunk aligned and head tilted.

Main Results:

  • No effect of microgravity when head and trunk were aligned.
  • Head tilting in microgravity caused deviation in visual egocentric coordinates.
  • Head-trunk angle estimation remained accurate despite altered visual perception.

Conclusions:

  • Neck proprioceptive signals are sufficient for accurate head-on-trunk spatial information in microgravity.
  • Microgravity alters the visual representation of head- and trunk-based egocentric coordinates.
  • Gravity plays a significant role in the visual perception of spatial orientation.