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The Journal of Neuroscience, March 1, 2002, 22(5):1850-1857
Taste-Specific Neuronal Ensembles in the Gustatory Cortex of Awake Rats
Donald B. Katz1, S. A. Simon1, 2, and Miguel A. L. Nicolelis1, 2 Departments of 1 Neurobiology and 2 Biomedical Engineering, Duke University, Durham, North Carolina 27710
In gustatory cortex, single-neuron activity reflects the multimodal processing of taste stimuli. Little is known, however, about the interactions between gustatory cortical (GC) neurons during tastant processing. Here, these interactions were characterized. It was found that 36% (85 of 237) of neuron pairs, including many (61%) in which one or both single units were not taste specific, produced significant cross-correlations (CCs) to a subset of tastants across a hundreds of milliseconds timescale. Significant CCs arose from the coupling between the firing rates of neurons as those rates changed through time. Such coupling significantly increased the amount of tastant-specific information contained in ensembles. These data suggest that taste-specific GC assemblies may transiently form and coevolve on a behaviorally appropriate timescale, contributing to rats' ability to discriminate tastants.
Key words: insular; taste; cross-correlation; multiple electrode; coding; dynamics
Copyright © 2002 Society for Neuroscience 0270-6474/02/2251850-08$05.00/0
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