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Dual mental functioning in a split-brain patient.

R Joseph1

  • 1Neurobehavioral Center, Santa Clara, California 95050.

Journal of Clinical Psychology
|September 1, 1988
PubMed
Summary
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Two split-brain patients showed unique disconnection syndromes after corpus callosotomy. One patient developed bilateral motor control, while the other exhibited two independent conscious awareness forms, demonstrating hemispheric laterality.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Corpus callosotomy severs the brain's hemispheres, creating
  • split-brain
  • patients.

Observation:

  • Two individuals underwent complete corpus callosotomies.
  • Both patients displayed disconnection syndromes.
  • Neurobehavioral and neuropsychological testing revealed significant differences.

Findings:

  • Patient 1-C's left hemisphere gained bilateral motor control.
  • Patient 2-C exhibited two independent forms of consciousness (left and right hemispheres).
  • 2-C's right hemisphere demonstrated independent information processing and behavioral control, sometimes conflicting with the left hemisphere.

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Implications:

  • Suggests distinct cognitive capabilities and consciousness can exist in isolated cerebral hemispheres.
  • Highlights the complexity of hemispheric laterality and functional specialization.
  • Raises questions about the neural basis of unified conscious experience.