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Related Experiment Videos

Size perception in hemianopia and neglect.

S Ferber1, H O Karnath

  • 1Department of Cognitive Neurology, University of Tübingen, Tübingen, Germany. sferber@julian.uwo.ca

Brain : a Journal of Neurology
|February 27, 2001
PubMed
Summary
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Spatial neglect is not solely caused by distorted size perception. While patients with neglect misperceive object size, hemianopia causes greater visual perception issues, indicating distinct neurological origins.

Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Psychology

Background:

  • Spatial neglect is a condition affecting awareness of the left visual space.
  • The role of size perception disturbances in spatial neglect is debated.
  • Visual field defects like hemianopia can also impact size perception.

Purpose of the Study:

  • To differentiate the effects of spatial neglect and hemianopia on horizontal size perception.
  • To determine if distorted size perception is a sufficient cause for visuospatial neglect.

Main Methods:

  • Compared size perception in patients with pure neglect, pure hemianopia, and both.
  • Utilized a size-comparison test to assess performance.

Main Results:

Related Experiment Videos

  • Pure neglect was associated with horizontal size misperception.
  • Pure hemianopia led to more significant impairments in size perception.
  • Lesion overlap in patients with impaired size perception was in the occipital lobe (Brodmann areas 17, 18), not the parietotemporal cortex.

Conclusions:

  • Distorted size perception is not sufficient to cause visuospatial neglect.
  • Spatial neglect is not an inevitable consequence of impaired size perception.
  • Hemianopia, not neglect, is more strongly linked to occipital lobe damage and size perception deficits.