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Subcortical contributions to drawing

A Kirk1, A Kertesz

  • 1Department of Clinical Neurological Sciences, Lawson Research Institute, St. Joseph's Health Centre, University of Western Ontario, London, Canada.

Brain and Cognition
|January 1, 1993
PubMed
Summary
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Subcortical strokes can cause drawing impairment, similar to cortical strokes. However, subcortical lesions impacting drawing are linked to broader cognitive deficits, not just localized cortical damage.

Area of Science:

  • Neuroscience
  • Cognitive Neurology
  • Neuropsychology

Background:

  • Constructional impairment is traditionally linked to cortical damage.
  • Subcortical lesions can cause disorders like aphasia, agraphia, and apraxia, indicating subcortical roles in cognition.
  • The impact of subcortical lesions on drawing ability is less understood compared to cortical lesions.

Purpose of the Study:

  • To compare the incidence and severity of drawing impairment after cortical versus subcortical strokes.
  • To investigate qualitative differences in drawings between patients with cortical and subcortical lesions.
  • To determine if subcortical lesions causing drawing impairment are associated with more widespread cognitive dysfunction.

Main Methods:

  • Studied 125 patients with single hemispheric strokes of comparable volume.

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  • Categorized patients into left/right cortical and left/right subcortical stroke groups.
  • Assessed drawing impairment using a standardized scoring system and compared findings between groups.

    • Main Results:

    • Confirmed known right/left hemisphere differences in drawing.
    • Found no significant differences in drawing impairment severity between cortical and subcortical lesions.
    • Drawing impairment after subcortical lesions, particularly left-sided, correlated with greater overall cognitive deficits.

    Conclusions:

    • Drawing impairment following stroke is not exclusive to cortical damage and can result from subcortical lesions.
    • Subcortical lesions affecting drawing ability are associated with more extensive cognitive dysfunction than similarly sized cortical lesions.
    • Drawing impairment following subcortical strokes does not necessarily indicate a localized cortical lesion.