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Updated: Dec 30, 2025

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Structural representations of fingers rely on both anatomical and spatial reference frames.

Karina Dolgilevica1, Matthew R Longo1, Luigi Tamè1

  • 1Department of Psychological Sciences, Birkbeck, University of London.

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|January 28, 2020
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Summary

Finger identification relies on both anatomical proximity and external spatial cues. This study shows how the brain integrates these factors to represent the hand structure.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Human Sensorimotor Control

Background:

  • Finger agnosia highlights a dissociation between body structural representations (BSRs) and sensorimotor abilities.
  • Recent findings suggest dynamic interactions between structural and sensorimotor body representations, influenced by factors like posture.

Purpose of the Study:

  • To investigate how anatomical and spatial proximity influence the representation of hand structure.
  • To determine the extent to which these factors shape BSRs.

Main Methods:

  • Utilized the "in-between" test with participants estimating finger numerosity between two stimulated fingers on the left hand.
  • Stimulation was applied to the first phalange on the left or right side of the fingers.

Main Results:

  • Judged finger numerosity was significantly higher when fingers were stimulated on the far sides compared to close or mid-distance sides.
  • This indicates that finger identification is modulated by the anatomical and spatial proximity of tactile stimulation.

Conclusions:

  • Body structural representations (BSRs) are shaped by both intrinsic anatomical information and extrinsic spatial reference frames.
  • The findings demonstrate that the brain integrates multiple spatial cues to construct and update body representations.