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Related Experiment Videos

Reduction of the elevator illusion from continued hypergravity exposure and visual error-corrective feedback

R B Welch1, M M Cohen, C W DeRoshia

  • 1NASA-Ames Research Center, Moffett Field, CA 94035-1000, USA. robert-welch@qmgate.arc.nasa.gov

Perception & Psychophysics
|January 1, 1996
PubMed
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Hypergravity exposure caused short-term motor control changes and an elevator illusion that habituated over time. Surprisingly, pointing errors were less than predicted by the illusion, challenging current models.

Area of Science:

  • Human physiology
  • Neuroscience
  • Space adaptation

Background:

  • Understanding human motor control and sensory perception in altered gravity is crucial for space exploration.
  • The elevator illusion and its relationship to vestibular and visual systems require further investigation.

Purpose of the Study:

  • To investigate the effects of hypergravity on motor control, visual localization, and hand-eye coordination.
  • To examine the influence of visual feedback on motor responses during hypergravity exposure.
  • To evaluate the habituation of the elevator illusion and its impact on pointing accuracy.

Main Methods:

  • Ten subjects underwent continuous hypergravity (+2 Gz) and 1-G control conditions, serving as their own controls.
  • Open-loop measures of motor control, visual localization, and hand-eye coordination were assessed before and after exposure.
Keywords:
NASA Center ARCNASA Discipline NeuroscienceNASA Discipline Number 16-10NASA Program Space Physiology and Countermeasures

Related Experiment Videos

  • Subjects performed pointing tasks with and without visual feedback during hypergravity exposure.

    • Main Results:

    • Hypergravity induced transient underreaching and negative aftereffects in motor control, alongside a declining elevator illusion attributed to otolith habituation.
    • Visual feedback led to a minor additional decrement and postexposure aftereffect, suggesting visual recalibration.
    • Pointing errors in the no-visual-feedback condition were significantly less than predicted by the elevator illusion.

    Conclusions:

    • Motor control and sensory perception are significantly affected by hypergravity, with some effects habituating over time.
    • Visual feedback plays a role in motor recalibration during hypergravity.
    • The observed pointing accuracy challenges the neural outflow model's explanation of the elevator illusion, suggesting alternative mechanisms may be involved.