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Grasping of virtual objects in changed gravity

O Bock1

  • 1Institute for Space and Terrestrial Science, North York, Canada.

Aviation, Space, and Environmental Medicine
|December 1, 1996
PubMed
Summary
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Grasping movements are impaired in altered gravity conditions. Grip aperture, crucial for object manipulation, was significantly reduced and less adaptable to target size during parabolic flights.

Area of Science:

  • Neuroscience
  • Human physiology
  • Space medicine

Background:

  • Grasping movements are fundamental to human motor behavior.
  • The impact of altered gravity on grasping is not well understood.

Purpose of the Study:

  • To investigate the effects of changed gravity on grip aperture formation during virtual grasping tasks.

Main Methods:

  • Subjects performed virtual grasping with thumb and index finger during parabolic flight.
  • Grip aperture was measured as the distance between fingertips from video recordings.

Main Results:

  • Final grip aperture was approximately 15% smaller in altered gravity compared to normal gravity.
  • Peak grip aperture modulation by target size was reduced by about 30% in hyper-G and micro-G.

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  • These effects were consistent across both hypergravity and microgravity phases.

    • Conclusions:

    • Altered gravity impairs virtual grasping, likely due to degraded sensory (visual/proprioceptive) input.
    • Increased computational load in unusual force environments may also contribute to grasping deficits.
    • Findings suggest challenges for motor control in space environments.