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Processing of spatial relations within and between the disconnected cerebral hemispheres.

J Sergent1

  • 1Cognitive Neurosciences Laboratory, Montreal Neurological Institute, Quebec, Canada.

Brain : a Journal of Neurology
|April 1, 1991
PubMed
Summary

Commissurotomized subjects

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuropsychology

Background:

  • The study investigates spatial relation processing in individuals with a severed corpus callosum.
  • Previous research suggested hemispheric asymmetries in processing spatial information.

Purpose of the Study:

  • To examine the independent and conjoint processing capabilities of disconnected cerebral hemispheres.
  • To investigate interhemispheric communication of visuospatial information in commissurotomy patients.

Main Methods:

  • Assessed judgments of relative position and distance between objects in visual space.
  • Used unilateral and bilateral visual field presentations with single response requirements.
  • Analyzed response accuracy and latency patterns.

Main Results:

  • Both disconnected hemispheres demonstrated equal competence in representing and operating on spatial relations.
  • Bilateral presentations enhanced accuracy and altered response patterns compared to unilateral ones.
  • Visuospatial information, not just pattern data, can be compared across hemispheres.

Conclusions:

  • The two hemispheres function independently and can conjointly process visuospatial information.
  • Interhemispheric comparison of visuospatial data occurs even with limited conscious awareness.
  • Findings clarify hemispheric contributions to visuospatial processing and commissurotomy brain function.

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