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Diagonal spatial neglect

V W Mark1, K M Heilman

  • 1Department of Neuroscience, University of North Dakota School of Medicine, Veterans Affairs Medical Center, Fargo, USA.

Journal of Neurology, Neurosurgery, and Psychiatry
|September 5, 1998
PubMed
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Stroke patients with diagonal neglect on cancellation tasks also show diagonal neglect on line bisection, suggesting a fundamental spatial disorder rather than a test-specific issue. Severity of stroke deficit correlates with neglect.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Clinical Neurology

Background:

  • Spatial neglect is a common deficit following stroke, particularly affecting the right hemisphere.
  • Previous research has focused on lateral neglect, but diagonal neglect is less understood.
  • The nature of diagonal neglect, whether test-dependent or a fundamental spatial disorder, requires further investigation.

Purpose of the Study:

  • To investigate if stroke patients exhibiting diagonal neglect on cancellation tasks also demonstrate diagonal neglect on line bisection tasks.
  • To determine if diagonal neglect reflects a fundamental spatial disorder or is specific to the testing method.
  • To explore the relationship between stroke laterality, spatial attention, and neglect severity.

Main Methods:

Related Experiment Videos

  • Nine patients with subacute right hemispheric stroke were assessed.
  • Patients performed line cancellation tasks, identifying targets in the near-left direction.
  • Diagonal line bisection tasks with opposing orientations were administered to assess bisection errors and the effect of line orientation.

    • Main Results:

    • Eight out of nine patients showed significant bisection errors.
    • Seven patients exhibited a line orientation effect, indicating a diagonal spatial bias.
    • Cancellation errors significantly correlated with the line orientation effect in bisection errors, suggesting a link between neglect severity and diagonal bias.

    Conclusions:

    • Diagonal neglect can manifest in stroke patients across different spatial attention tests.
    • The findings suggest diagonal neglect may represent a fundamental spatial attentional disturbance in right hemispheric stroke.
    • Increased stroke deficit severity, as measured by cancellation errors, is associated with a greater degree of diagonal neglect.