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Related Experiment Videos

Functional relationship between somatosensory cortex and specialized afferent pathways in the monkey.

A S Schwartz

    Experimental Neurology
    |February 1, 1983
    PubMed
    Summary

    The primate dorsal funiculus (DF) and extra-DF pathways process distinct tactile information. Area 3b receives both, while area 2 specifically processes DF information crucial for movement-based discrimination.

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    Area of Science:

    • Neuroscience
    • Somatosensory System
    • Tactile Perception

    Background:

    • Primate dorsal funiculus (DF) is vital for tactile discrimination involving movement.
    • Extra-DF spinal afferent fibers are sufficient for tactile discrimination without movement.

    Purpose of the Study:

    • Investigate the association between cortical regions and the specialized tactile roles of DF and extra-DF afferent systems.
    • Define the cortical distribution and processing of DF and extra-DF information.

    Main Methods:

    • Monkeys performed two tasks: one DF-dependent, one mediated by extra-DF pathways.
    • Cortical lesions were made in various areas (3b, 1, 5, 7, 2) to assess task performance.
    • Impact of lesions on DF and extra-DF mediated tasks determined information processing pathways.

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    Main Results:

    • Lesions in area 3b impaired both tasks, with greater impact on DF tests.
    • Lesions in areas 1, 5, or 7 had no effect on either task.
    • Ablation of area 2's forelimb region selectively impaired DF discriminations.

    Conclusions:

    • Both DF and extra-DF tactile information converge in area 3b.
    • Extra-DF information projects diffusely to widespread cortical regions, allowing for resilience to limited ablations.
    • DF information is transmitted compactly to a focal region within area 2.