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A new look at the human split brain.

J Sergent1

  • 1Montreal Neurological Institute, Quebec, Canada.

Brain : a Journal of Neurology
|October 1, 1987
PubMed
Summary
This summary is machine-generated.

Split-brain patients, despite disconnected hemispheres, can integrate information for unified action. This study reveals behavioral unity in split-brain individuals, demonstrating a cohesive organismic response.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Split-brain syndrome arises from severed neocortical commissures, leading to hemisphere information exchange incapacity.
  • Previous research often viewed split-brain hemispheres as independent entities.
  • This study adopts a novel perspective, treating the split brain as a single organism with interconnected subcortical structures.

Purpose of the Study:

  • To investigate if split-brain patients can integrate information from disconnected hemispheres for unified responses.
  • To explore the concept of behavioral unity in split-brain individuals despite perceptual disunity.

Main Methods:

  • Eight independent tasks were administered to two split-brain patients.
  • Simultaneous bilateral information was presented tachistoscopically, with insufficient data for individual hemisphere decisions.

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  • Performance was assessed based on the ability to combine segregated information for correct responses.

    • Main Results:

    • Both patients performed significantly above chance in 7 out of 8 tasks, including spatial orientation, calculation, and lexical decision.
    • This indicates successful integration of information divided between the hemispheres.
    • Patients achieved unified responses despite each hemisphere lacking awareness of the other's input.

    Conclusions:

    • The split-brain can function as a unified organism, integrating divided information for cohesive behavior.
    • Results demonstrate perceptual disunity alongside behavioral unity in split-brain patients.
    • This challenges the notion of complete hemispheric independence in split-brain syndrome.