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Related Experiment Videos

How important are changes in body weight for mass perception?

H E Ross1

  • 1Department of Psychology, University of Stirling, Scotland.

Acta Astronautica
|September 1, 1981
PubMed
Summary
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Weight perception relies on more than just effort; mass constancy helps maintain perceived weight even when effort cues change. Adaptation to altered gravity improves mass constancy, but sudden arm weight changes impair weight discrimination.

Area of Science:

  • Human sensory perception
  • Biomechanics
  • Gravitational effects on physiology

Background:

  • Weight judgments are commonly believed to depend on lifting effort against gravity.
  • Apparent heaviness is influenced by effort and other cues, but mass constancy is observed when these cues are decoupled from actual mass.

Purpose of the Study:

  • To investigate the factors influencing weight and mass perception.
  • To explore the role of self-motion cues (e.g., altered arm weight) in weight judgments.
  • To understand the effects of adaptation and maladaptation on weight discrimination.

Main Methods:

  • Analysis of apparent heaviness under altered sensory conditions (e.g., underwater, altered gravity).
  • Examination of mass constancy and its relationship to adaptation.

Related Experiment Videos

  • Assessment of weight and mass discrimination following sudden changes in arm weight.

    • Main Results:

    • Mass constancy tends to occur when effort cues are unrelated to actual mass.
    • Adaptation to altered gravitational or inertial environments enhances mass constancy.
    • Sudden changes in arm weight, similar to sensory cue reduction, impair weight and mass discrimination.

    Conclusions:

    • Weight perception is a complex process influenced by multiple sensory cues, not solely lifting effort.
    • The body's own weight changes likely serve as crucial cues for judging external object weights.
    • Further research, particularly in prolonged spaceflight, is needed to fully understand the interplay of factors in weight perception.