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Related Experiment Videos

Dissociated neglect for objective and subjective sizes

S Ishiai1, Y Koyama, K Seki

  • 1Department of Rehabilitation, Tokyo Metropolitan Institute for Neuroscience, Japan.

Journal of Neurology
|December 24, 1997
PubMed
Summary

Patients with left unilateral spatial neglect showed increased rightward deviation on line bisection tasks with longer lines. For shorter lines, their performance indicated discrimination of objective lengths, suggesting attention to size-scaled coordinates.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Clinical Neurology

Background:

  • Unilateral spatial neglect (USN) is a cognitive deficit often resulting from right parietal lobe damage.
  • Investigating USN in near space is crucial for understanding its impact on daily activities.
  • Line bisection tasks assess spatial attention deficits, but manual responses can confound results.

Observation:

  • A fixation-based line bisection task was used to study five patients with USN following right parietal lesions.
  • The study examined how line length and viewing distance affect performance in near space.
  • Performance was measured by rightward deviation in visual angle and length.

Findings:

  • Rightward deviation increased linearly with the visual angle for lines 150 mm or longer.

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  • This linear relationship did not apply to lines 100 mm or shorter.
  • For short lines, deviation remained constant across varying visual angles and viewing distances, indicating objective length discrimination.

    • Implications:

    • Spatial neglect may involve different attentional mechanisms for small versus large objects.
    • Patients with USN might rely on objective size-scaled coordinates for perceiving small items.
    • Findings suggest potential targets for rehabilitation strategies aimed at improving spatial awareness in neglect patients.