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Related Experiment Videos

Immediate thalamic sensory plasticity depends on corticothalamic feedback.

D J Krupa1, A A Ghazanfar, M A Nicolelis

  • 1Department of Neurobiology, Duke University Medical Center, Durham, NC 27710, USA. krupad@neuro.duke.edu

Proceedings of the National Academy of Sciences of the United States of America
|July 8, 1999
PubMed
Summary

Descending corticofugal projections influence thalamic receptive fields and plasticity. Inactivating the primary somatosensory cortex altered ventroposterior medial thalamus organization and reduced, but did not abolish, plasticity after peripheral deafferentation.

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Area of Science:

  • Neuroscience
  • Somatosensory System
  • Thalamic Plasticity

Background:

  • The primary somatosensory (SI) cortex and ventroposterior medial (VPM) thalamus are key components of the somatosensory system.
  • Understanding the interplay between cortical and thalamic processing is crucial for comprehending sensory information flow and adaptation.

Purpose of the Study:

  • To quantify the contribution of descending corticofugal projections to normal VPM receptive field organization.
  • To investigate the role of corticofugal projections in immediate thalamic somatosensory plastic reorganization following peripheral deafferentation.

Main Methods:

  • Simultaneous multi-neuron ensemble recordings from SI cortex and VPM.
  • Combined reversible inactivation of SI cortex and peripheral trigeminal nerve block.

Related Experiment Videos

  • Analysis of receptive field properties and plasticity before and during interventions.

    • Main Results:

    • Reversible SI cortex inactivation caused immediate changes in VPM receptive field properties.
    • Cortical inactivation significantly reduced, but did not abolish, VPM receptive field reorganization after peripheral deafferentation.

    Conclusions:

    • Descending corticofugal projections play a significant role in shaping normal VPM receptive fields.
    • Immediate thalamic plasticity following peripheral deafferentation relies on both descending corticofugal and ascending trigeminothalamic pathways.