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Related Experiment Videos

Symmetric sensorimotor somatotopy.

Simon A Overduin1, Philip Servos

  • 1Department of Brain and Cognitive Sciences and McGovern Institute for Brain Research, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.

Plos One
|January 31, 2008
PubMed
Summary
This summary is machine-generated.

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High-resolution functional magnetic resonance imaging reveals widespread, structured finger-related activation in human somatosensory and motor cortex. This challenges assumptions based on monkey electrophysiology, showing functional mirroring between input and output cortical areas.

Area of Science:

  • Neuroscience
  • Human neuroimaging
  • Somatosensory system

Background:

  • Functional imaging studies human cortical organization, often by comparison to monkey models.
  • Current methods rely on invasive electrophysiology in monkeys, recording limited cell samples.

Purpose of the Study:

  • To investigate detailed somatosensory organization in the human cortex using advanced functional imaging.
  • To challenge the assumption that human cortical areas must mirror monkey models.

Main Methods:

  • High-resolution functional magnetic resonance imaging (fMRI) in human subjects.
  • Pneumatic stimulation of the thumb, index, and ring fingers.

Main Results:

  • Widespread cortical activation observed in primary somatosensory and motor cortex.

Related Experiment Videos

  • Finger-related activation was not strictly somatotopic but showed disproportionate responses to fingertip stimulation.
  • Activation patterns exhibited symmetry through the central sulcus, indicating inputs to both primary somatosensory and motor cortices.

    • Conclusions:

    • Human finger-related cortical activation is widespread and structured, not confined to discrete somatotopic maps.
    • Findings suggest functional mirroring between cortical areas traditionally assigned input (somatosensory) or output (motor) functions.
    • Challenges the direct translation of monkey electrophysiology findings to human cortical organization.