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Perceived hand size and perceived hand weight.

Denise Cadete1, Vincenzo P Marino1, Elisa R Ferrè1

  • 1School of Psychological Sciences, Faculty of Science, Birkbeck, University of London, Malet Street, London WC1E 7HX, United Kingdom.

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Summary
This summary is machine-generated.

The perceived size of your hand influences how heavy it feels. Embodying a smaller hand makes it feel heavier, while a larger hand feels lighter, challenging typical weight perception.

Keywords:
Bodily weight perceptionBody perceptionSize-weight illusionWeight perception

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Area of Science:

  • Neuroscience
  • Psychology
  • Sensory Perception

Background:

  • Object size significantly impacts perceived weight, a phenomenon known as the size-weight illusion.
  • Recent studies show a tendency to underestimate hand weight, but the role of perceived body part size remains unclear.

Purpose of the Study:

  • To investigate how manipulating perceived hand size affects the perceived weight of one's own hand.
  • To determine if body part weight perception is subject to the same size-weight illusion as external objects.

Main Methods:

  • A visual-tactile illusion using magnifying and minifying mirrors was employed to alter participants' perception of their hand size.
  • Perceived hand weight was measured using a psychophysical matching task comparing wrist-hung weights to the perceived hand weight.

Main Results:

  • Participants underestimated their hand weight more when their hand was perceived as smaller.
  • Conversely, underestimation of hand weight decreased when the hand was perceived as larger.
  • The perceived size of the hand significantly modulated its perceived weight.

Conclusions:

  • Perceived hand size plays a crucial role in modulating perceived hand weight.
  • The perception of body part weight appears to be processed differently from object weight, showing resistance to the typical size-weight illusion.
  • A constant density model is proposed to explain the influence of hand size on perceived hand weight.