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Updated: Nov 30, 2025

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The downsized hand in personal neglect.

Pietro Caggiano1, Laura Veronelli2, Laura Mora1

  • 1Department of Psychology, Goldsmiths University of London , London, UK.

Journal of Clinical and Experimental Neuropsychology
|November 18, 2020
PubMed
Summary
This summary is machine-generated.

Patients with personal neglect (PN) underestimate their left hand size, indicating altered body representation after right brain damage. This study quantifies how hemiplegia and PN uniquely impact body perception.

Keywords:
Hemispatial neglectbody representationneuropsychologypersonal neglectstroke

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Rehabilitation Medicine

Background:

  • Personal neglect (PN) is a disorder of spatial attention, typically following right hemisphere brain damage, affecting awareness of the contralesional body side.
  • PN is linked to disrupted body representation, including difficulties with hand laterality and visuospatial mapping.
  • The metric representation of body parts, particularly hands, in PN remains underexplored.

Purpose of the Study:

  • To investigate the metric representation of hands in patients with personal neglect (PN) and hemiplegia.
  • To compare the perceived hand width in patients with right hemisphere lesions (with and without PN) and healthy controls.

Main Methods:

  • A judgment of passability task was used to assess perceived hand width.
  • Participants (11 hemiplegic patients with right brain lesions, 5 with PN, and 12 controls) imagined inserting their hands through apertures of varying sizes.
  • Parametric, non-parametric, and single-case analyses were employed to analyze the data.

Main Results:

  • Patients with PN significantly underestimated the width of their left hand compared to their right hand.
  • Hemiplegic patients without PN perceived their affected (right) hand as larger than their unaffected (left) hand.
  • Hand distortion patterns differed quantitatively and qualitatively between patients with and without PN.

Conclusions:

  • Findings confirm distorted body representation following right brain damage, consistent with existing literature.
  • This study provides novel evidence of distinct quantitative and qualitative differences in body representation deficits caused by hemiplegia and personal neglect.
  • The results highlight the specific impact of PN on the metric representation of the contralesional body space.