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Related Experiment Videos

Interhemispheric communication after section of the forebrain commissures.

J J Myers, R W Sperry

    Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
    |June 1, 1985
    PubMed
    Summary

    Cognitive information travels between brain hemispheres via subcortical pathways, not just the corpus callosum. This non-identity information aids the disconnected left hemisphere in identifying right-hemisphere stimuli.

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    Area of Science:

    • Neuroscience
    • Cognitive Psychology
    • Neurobiology

    Background:

    • The corpus callosum (neocortical commissures) is the primary pathway for interhemispheric information transfer.
    • Split-brain studies typically show functional independence between the cerebral hemispheres after callosal sectioning.
    • Exceptions to disconnection symptoms suggest alternative communication routes.

    Purpose of the Study:

    • To investigate interhemispheric cognitive information transfer beyond the neocortical commissures.
    • To explore the nature of information transmitted through subcortical pathways.
    • To determine if subcortical communication can account for atypical findings in split-brain subjects.

    Main Methods:

    • Utilized a technique for prolonged visual lateralization in split-brain subjects.

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  • Presented stimuli to one visual hemifield, targeting specific cerebral hemispheres.
  • Employed cognitive strategies to assess interhemispheric information processing.

    • Main Results:

    • Evidence suggests cognitive information is transmitted interhemispherically via subcortical pathways.
    • Transmitted subcortical information is contextual or associative, not stimulus identity.
    • The disconnected left hemisphere, using subcortical input and cognitive strategies, can verbally identify stimuli projected to the right hemisphere.

    Conclusions:

    • Subcortical pathways provide a route for interhemispheric cognitive information transfer.
    • This pathway facilitates cross-hemispheric communication, explaining some exceptions to disconnection syndromes.
    • Findings challenge the notion that the disconnected right hemisphere is solely responsible for naming stimuli in the left visual field.