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Related Experiment Videos

Cortically-induced coherence of a thalamic-generated oscillation.

A Destexhe1, D Contreras, M Steriade

  • 1Laboratoire de Neurophysiologie, Faculté de Médecine, Université Laval, Québec, Canada.

Neuroscience
|July 17, 1999
PubMed
Summary

Cortical excitability influences brain wave synchrony. Enhancing cortical cell excitability boosts large-scale brain oscillations via cortex-thalamus-cortex loops, mimicking natural sleep patterns.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience

Background:

  • Neocortical electrical activity exhibits variable synchrony, but mechanisms remain unclear.
  • Spindle oscillation coherence differs across brain states, being high during natural sleep and disrupted by cortical depression.

Purpose of the Study:

  • Investigate mechanisms of varying brain oscillation coherence.
  • Explore the role of cortical and thalamic neuronal interactions in synchrony.

Main Methods:

  • Analysis of multisite local field potentials during different states.
  • Computational modeling of interacting cortical and thalamic neurons.

Main Results:

  • Cortical excitability modulation affects spatiotemporal coherence independently of thalamic changes.

Related Experiment Videos

  • Enhanced cortical pyramidal cell excitability, simulating neuromodulators, maximized oscillation coherence.
  • Cortex-thalamus-cortex loops were identified as key for generating coherent feedback and oscillations.

    • Conclusions:

    • The cortex plays a significant role in initiating and synchronizing thalamic oscillations via corticothalamic feedback.
    • Intracortical mechanisms, through cortex-thalamus-cortex loops, may synchronize oscillations over millimeters, explaining large-scale thalamocortical coherence.