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Physiological evidence for serial processing in somatosensory cortex.

T P Pons, P E Garraghty, D P Friedman

    Science (New York, N.Y.)
    |July 24, 1987
    PubMed
    Summary
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    Removing a body part representation in the postcentral cortex deactivated the corresponding body part in the second somatosensory area (S2). However, S2 removal did not affect the postcentral cortex, suggesting serial processing in somatosensory pathways.

    Area of Science:

    • Neuroscience
    • Somatosensory research
    • Cortical processing

    Background:

    • The organization of sensory processing in the brain, particularly the somatosensory system, is crucial for understanding perception and function.
    • Previous research suggested potential serial processing in sensory modalities, but direct evidence in somatosensation was limited.

    Purpose of the Study:

    • To investigate the functional relationship and processing order between the postcentral cortex and the second somatosensory area (S2) in macaques.
    • To determine if somatosensory information is processed sequentially between these two cortical regions.

    Main Methods:

    • Electrophysiological recordings were performed in macaque brains.
    • The representation of a specific body part was selectively removed from the postcentral cortex.

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  • The entire second somatosensory area (S2) was removed.
  • Somatic responsivity was assessed in both areas before and after the removals.

    • Main Results:

    • Removal of a body part representation in the postcentral cortex led to the deactivation of the corresponding body part representation in S2.
    • Complete removal of S2 did not result in any detectable changes in the somatic responsivity of neurons in the postcentral cortex.

    Conclusions:

    • This study provides direct electrophysiological evidence for serial cortical processing in the somatosensory system, with the postcentral cortex preceding S2.
    • The findings support a common cortical plan for sensory information processing across different modalities, including vision and somatosensation.