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Cerebellar allocentric and action-intentional spatial neglect.

Nicholas J Milano1, Kenneth M Heilman

  • 1Department of Neurology, University of Florida College of Medicine, Center for Neuropsychological Studies, and the Malcom Randall Veterans Affairs Medical Center, Gainesville, Florida.

Cognitive and Behavioral Neurology : Official Journal of the Society for Behavioral and Cognitive Neurology
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Summary
This summary is machine-generated.

Left cerebellar hemorrhage can cause object-centered neglect and a leftward action bias. This case study highlights rare neurological symptoms following cerebellar damage, expanding our understanding of spatial neglect.

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Area of Science:

  • Neuroscience
  • Neurology
  • Cognitive Psychology

Background:

  • Contralesional hemispatial neglect typically arises from right temporoparietal lesions.
  • Frontal lobe lesions can cause both contralesional and ipsilesional neglect.
  • Left cerebellar lesions have been anecdotally linked to ipsilesional, egocentric neglect.

Observation:

  • A 61-year-old woman presented with symptoms 7 months post-left cerebellar hemorrhage.
  • She exhibited emotional lability, gait difficulties, and frequent left-sided collisions.
  • Neurological exam revealed ocular dysmetria and left limb ataxia.

Findings:

  • Neuropsychological testing confirmed neglect, specifically left allocentric neglect.
  • The patient demonstrated leftward deviation in clock and figure drawing tasks.
  • Performance on an open-triangle cancellation task indicated neglect of left-sided openings.

Implications:

  • This case suggests left cerebellar lesions can induce left allocentric neglect and action-intentional bias.
  • Findings challenge previous understandings of cerebellar roles in spatial attention.
  • Potential right frontal dysfunction superimposed on global attention deficits may explain the observed symptoms.