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Humans significantly underestimate their hand weight due to central nervous system processing. Fatigue increases perceived limb weight, revealing how our brains construct body part awareness.

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Area of Science:

  • Neuroscience
  • Human Perception
  • Biophysics

Background:

  • Body part weight is determined by mass and gravity, but perceived weight is a central nervous system construct.
  • The sense of effort, related to motor commands, influences perceived object weight, with fatigue and injury increasing perceived heaviness.
  • While limb heaviness is reported in conditions like stroke and amputation, the perceived weight of healthy body parts is under-researched.

Purpose of the Study:

  • To quantify the underestimation of hand weight in healthy adults.
  • To investigate the effect of experimentally induced fatigue on perceived hand weight.

Main Methods:

  • A psychophysical matching task was employed to measure the subjective experience of hand weight.
  • Hand fatigue was experimentally induced to assess its impact on perceived weight.

Main Results:

  • Healthy adults systematically underestimated their hand weight by an average of 49.4%.
  • Experimental induction of hand fatigue led to a significant increase in the perceived weight of the hand.

Conclusions:

  • The central nervous system systematically underestimates the actual weight of body parts, specifically the hand.
  • Perceived body part weight is dynamic and influenced by factors like muscle fatigue, highlighting the brain's active role in constructing somatosensory experience.