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Controlled Cortical Impact Model for Traumatic Brain Injury
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Representational drawing following brain injury.

Linda Carson1, Alexandre Filipowicz2, Britt Anderson1

  • 1Department of Psychology, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada.

Neuropsychologia
|August 10, 2019
PubMed
Summary

Visuoconstructional deficits after brain injury are not solely dependent on the right hemisphere. Quantitative analysis of drawings revealed that both left and right brain damage can impair figure copying, challenging existing models.

Keywords:
Figure copyingNeglectRepresentational drawingVLSMVisuoconstructional skills

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Damage to either brain hemisphere can impair visuoconstructional skills like drawing.
  • Existing research suggests distinct deficits based on hemisphere, with the right hemisphere crucial for spatial relations and the left for organization.
  • Previous assessments relied on qualitative methods, limiting objective analysis.

Purpose of the Study:

  • To quantitatively analyze drawing performance in patients with left and right brain damage.
  • To investigate the specific roles of each hemisphere in visuoconstructional tasks.
  • To challenge models emphasizing right hemisphere dominance in figure copying.

Main Methods:

  • Quantitative analysis of cube and star drawings from 50 stroke patients (23 left brain damaged, 27 right brain damaged).
  • Voxel-wise lesion symptom mapping (VLSM) to correlate brain lesions with specific drawing errors.
  • Analysis sensitive to neglect and other error types, with and without left-sided omissions.

Main Results:

  • Neglect in right brain damaged patients exaggerated errors, particularly scale and proportion for the star drawing.
  • After removing left-sided omissions, no significant difference in drawing errors was found between left and right brain damaged patients.
  • VLSM identified white matter involvement for scale errors in cube drawings, with a minor role for the right insula.

Conclusions:

  • Figure copying is a complex task dependent on large-scale neural networks involving both hemispheres.
  • Models emphasizing right hemisphere dominance for visuoconstructional capacity are not entirely accurate.
  • Quantitative analysis provides a more nuanced understanding of brain-lesion effects on drawing.