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Thalamocortical angular tuning domains within individual barrels of rat somatosensory cortex.

Authors
  • Bruno, Randy M
  • Khatri, Vivek
  • Land, Peter W
  • Simons, Daniel J
Type
Published Article
Journal
Journal of Neuroscience
Publisher
Society for Neuroscience
Publication Date
Oct 22, 2003
Volume
23
Issue
29
Pages
9565–9574
Identifiers
PMID: 14573536
Source
Medline
License
Unknown

Abstract

In the rodent somatosensory cortex, whisker-related barrels in layer IV are morphological counterparts of functional cortical columns that extend throughout the cortical depth. We used microelectrode recordings and spike-triggered averaging of field potentials evoked by single thalamic barreloid neurons to investigate functional thalamocortical microcircuits. The function of such circuits was probed by deflecting the principal whisker of a barrel in different angular directions. We found that individual barrels contain minicolumns of neurons preferring the same deflection angle. Angular tuning domains are established by convergent inputs from thalamocortical cells with corresponding angular preferences. Processing within such domains may depend on local connectivity among vertically aligned barrel neurons.

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