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Related Experiment Videos

Internal dynamics determine the cortical response to thalamic stimulation.

Jason N MacLean1, Brendon O Watson, Gloster B Aaron

  • 1Howard Hughes Medical Institute, Department of Biological Sciences, Columbia University, New York, New York 10027, USA. JM2107@columbia.edu

Neuron
|December 13, 2005
PubMed
Summary

Spontaneous neocortical UP states are similar to thalamically triggered activity. Thalamic input releases intrinsic cortical dynamics, with intracortical connectivity dominating the response.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Systems Neuroscience

Background:

  • Spontaneous neocortical activity is prevalent but its relationship with sensory input-driven activity is not well understood.
  • Layer 4 of the neocortex is a key recipient of thalamic inputs, making it crucial for understanding sensory processing.

Purpose of the Study:

  • To investigate the relationship between spontaneous neocortical activity and activity evoked by thalamic stimulation.
  • To determine if thalamic inputs can trigger intrinsic cortical dynamics and how this relates to spontaneous activity patterns.

Main Methods:

  • Utilized in vitro calcium imaging in mouse thalamocortical slices.
  • Reconstructed spatiotemporal dynamics of layer 4 neuronal activity at single-cell resolution.
  • Compared activity patterns during spontaneous events versus thalamic stimulation at varying frequencies.

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Main Results:

  • Spontaneous neuronal coactivations in layer 4 correspond to intracellular UP states.
  • Thalamic stimulation above 10 Hz triggered cortical UP states that were indistinguishable from spontaneous ones.
  • Neurons exhibited identical and precise spatiotemporal activation patterns in both spontaneous and thalamically triggered events.

Conclusions:

  • Intracortical connectivity plays a dominant role in the cortical response to thalamic inputs.
  • The thalamus acts to release intrinsic cortical dynamics rather than imposing entirely new patterns.
  • Precise spatiotemporal activity patterns in the neocortex can be initiated by thalamic inputs.