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Barrel cortex and whisker-mediated behaviors.

Michael Brecht1

  • 1Bernstein Center for Computational Neuroscience, Humboldt University Berlin, Philippstr. 13 House 6, 10115 Berlin, Germany. michael.brecht@bccn-berlin.de

Current Opinion in Neurobiology
|August 19, 2007
PubMed
Summary

The rodent barrel cortex processes sensory information through distinct pathways, integrating inputs in lower layers. This neural network enables rapid, invariant tactile object recognition based on shape perception.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Sensory Systems

Background:

  • The rodent barrel cortex is a model system for understanding neural processing.
  • It receives input from two main thalamic pathways: the lemniscal and paralemniscal.
  • These pathways undergo transformations within cortical columns.

Purpose of the Study:

  • To quantitatively understand response transformations in a barrel cortex column.
  • To elucidate the roles of different cortical layers and pathways in sensory processing.
  • To investigate the neural basis of tactile object recognition.

Main Methods:

  • Analysis of neural network architecture in the barrel cortex.
  • Characterization of thalamocortical and intracortical connections.
  • Examination of spatiotemporal response properties of neural populations.

Main Results:

  • Two thalamic pathways are transformed into approximately 7 distinct population outputs.
  • Granular and supragranular layers segregate pathway processing; infragranular layers integrate them.
  • Sensory responses are shaped by weak thalamocortical and strong intracortical connections, with rapid inhibition and low overall activity.

Conclusions:

  • The barrel cortex exhibits segregated and integrated processing streams.
  • Neural computations support rapid, invariant tactile object recognition (Gestaltwahrnehmung).
  • Understanding barrel cortex offers insights into cortical column function and sensory perception.