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Proximal intentional neglect: a case study

M Gold1, J Shuren, K M Heilman

  • 1Department of Neurology, University of Florida College of Medicine, Gainesville 32610-0236.

Journal of Neurology, Neurosurgery, and Psychiatry
|November 1, 1994
PubMed
Summary
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This study describes motor intentional neglect in the radial plane for the first time. A patient with a right parietal infarct demonstrated a failure to move towards or within proximal space, impacting their search strategy.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Spatial neglect is a common deficit following brain injury, affecting horizontal, vertical, and radial planes.
  • Previous research has identified sensory-attentional, motor-intentional, and representational deficits in neglect.
  • Motor intentional neglect in the radial plane remained undescribed before this study.

Observation:

  • A patient with a right parietal infarct was assessed using a modified cancellation task with a fixed window.
  • This task design aimed to control attentional demands and differentiate between intentional and representational neglect.
  • The patient exhibited a specific deficit in initiating movements towards or within proximal space.

Findings:

  • The patient displayed proximal (radial) intentional neglect, a novel finding in the radial plane.

Related Experiment Videos

  • Unlike control participants, the patient's search time did not decrease with increasing window size.
  • This suggests a search strategy not adapting to spatial parameters but rather resource allocation over a fixed time.

    • Implications:

    • This research expands our understanding of spatial neglect by identifying a new manifestation in the radial plane.
    • The findings contribute to dissociating different components of neglect, specifically motor-intentional deficits.
    • This work may inform the development of targeted rehabilitation strategies for patients with parietal lobe injuries and spatial neglect.