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Related Experiment Videos

Evidence for separate allocentric and egocentric space processing in neglect patients

L Pizzamiglio1, C Guariglia, T Cosentino

  • 1Department of Psychology, University of Rome La Sapienza, IRCCS S. Lucia, Italy. pizzamiglio@uniroma1.it

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|January 1, 1999
PubMed
Summary

Spatial orientation abilities were tested in patients with hemispatial neglect. Findings show that while the shape of an environment aids orientation, a visual cue

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Spatial Cognition

Background:

  • Spatial orientation relies on environmental geometry and external cues.
  • Hemispatial neglect, often resulting from right-brain damage, impairs spatial awareness.

Purpose of the Study:

  • To investigate spatial orientation in normal controls and patients with hemispatial neglect.
  • To determine how geometric environmental information and visual cues are utilized by different subject groups.

Main Methods:

  • Spatial orientation tasks were performed under two conditions: enclosure shape only, and enclosure shape with a visual cue.
  • Participants included normal controls, right brain-damaged patients without neglect, and right brain-damaged patients with hemispatial neglect.

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Main Results:

  • Normal controls and patients without neglect effectively used both environmental geometry and visual cues.
  • Patients with hemispatial neglect, as a group, used environmental shape more than visual cues.
  • Individual patients with hemispatial neglect showed distinct patterns: some improved with cues, while others did not benefit from them.

Conclusions:

  • Hemispatial neglect may involve a dissociation in spatial processing, potentially related to allocentric versus egocentric coding.
  • The ability to utilize environmental geometry and external cues can vary significantly within patients with hemispatial neglect.