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Mass discrimination during prolonged weightlessness.

H Ross, E Brodie, A Benson

    Science (New York, N.Y.)
    |July 13, 1984
    PubMed
    Summary
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    Human sensitivity to inertial mass is lower than to weight, as shown by zero-gravity flight experiments. Adaptation to weightlessness partially compensates, with aftereffects lasting days post-flight.

    Area of Science:

    • Human sensory perception
    • Spaceflight physiology

    Background:

    • Understanding human sensory adaptation to altered gravity is crucial for space exploration.
    • Previous research indicates differences in how humans perceive mass and weight.

    Purpose of the Study:

    • To quantify human mass discrimination thresholds in microgravity.
    • To compare mass perception in zero gravity with weight perception in normal gravity.
    • To investigate the adaptive mechanisms and aftereffects of weightlessness on sensory perception.

    Main Methods:

    • Participants performed mass discrimination tasks during parabolic flights (simulating zero gravity).
    • Weight discrimination thresholds were measured before and after the flight.
    • Statistical analysis compared thresholds between conditions.

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    Main Results:

    • Mass discrimination thresholds in zero gravity were approximately 1.8 times higher than pre-flight weight discrimination thresholds.
    • This indicates reduced sensitivity to inertial mass compared to weight.
    • Weight discrimination thresholds remained elevated for 2-3 days post-flight.

    Conclusions:

    • Humans are less sensitive to inertial mass than to weight.
    • Sensory adaptation to weightlessness offers only partial compensation for altered gravitational cues.
    • Post-flight sensory recalibration, or aftereffects, influences weight perception for several days.