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Updated: Sep 19, 2025

Estimation of Contact Regions Between Hands and Objects During Human Multi-Digit Grasping
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Underestimation of human hand density.

Denise Cadete1, Pearl Young1, Brad Hallett1

  • 1School of Psychological Sciences, Birkbeck, University of London, United Kingdom.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|June 17, 2025
PubMed
Summary
This summary is machine-generated.

Our brains distort our perception of our hands, overestimating volume by 24% and underestimating weight by 25%. This leads to a perceived hand density similar to foam beads, suggesting a stable, low-density representation.

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Area of Science:

  • Neuroscience
  • Perception Science
  • Somatosensory research

Background:

  • The brain represents the body's physical properties like volume, weight, and density.
  • Previous research indicates distorted perceptions of hand size and weight.

Purpose of the Study:

  • To investigate the perception of hand volume without experimental manipulation.
  • To quantify perceived hand volume, weight, and density.
  • To understand the relationship between these physical property representations.

Main Methods:

  • Participants estimated their hand volume and weight without alterations.
  • Perceived hand density was calculated from perceived volume and weight.
  • Comparison of perceived versus actual physical properties.

Main Results:

  • Participants overestimated hand volume by an average of 24%.
  • Hand weight was underestimated by an average of 25%.
  • Perceived hand density was significantly lower than actual density (31% underestimation).

Conclusions:

  • The brain may maintain a stable, low-density representation of hand density.
  • Perceived hand weight and volume adjust to this stable density representation.
  • Body part perception, including physical properties, is inherently distorted.