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J Neurophysiol (March 1, 2003). 10.1152/jn.00655.2002
Submitted on Submitted 14 August 2002; accepted in final form 31 October 2002
1Department of Organismal Biology and Anatomy, 2Committee on Neurobiology, The University of Chicago, Chicago, Illinois 60637
Rauske, Peter L.,
Stephen D. Shea, and
Daniel Margoliash.
State and Neuronal Class-Dependent Reconfiguration in the Avian
Song System. J. Neurophysiol. 89: 1688-1701, 2003. Sensory systems may adapt to behavioral requirements
through state-dependent changes. In the forebrain song-system nucleus HVc of zebra finches, state-dependent auditory responses have been described in multiunit recordings. Here we report on behavioral state-dependent changes in the activity of distinct HVc neuronal classes. HVc projection neurons were identified by electrically stimulating HVc's target nuclei, the robust nucleus of the
archistriatum and Area X, in anesthetized zebra finches. Projection
neurons and two classes of putative interneurons could be distinguished on the basis of extracellular spike waveforms, with the first two
factors of a principal components analysis accounting for 81% of the
variance in spike morphometric values. Spike width was the best single
variable for distinguishing among the neuronal classes. Putative
interneurons had much higher firing rates spontaneously and in response
to song than did projection neurons, which had extremely low
spontaneous rates and phasic responses to song. Recordings from HVc in
behaving animals were dominated by the two classes of putative
interneurons. Both classes showed strong, selective, and temporally
similar auditory responses during sleep, but only one class of
interneurons reliably maintained auditory responses on waking. These
responses were weaker and less selective than those seen during sleep.
The observation that HVc auditory responsiveness in awake zebra finches
is restricted to some classes of neurons may help explain prior
multiunit results that suggested nearly complete suppression of HVc
auditory responses in awake birds. We propose that the heterogeneous
effects of behavioral state on distinct subpopulations of HVc neurons
allow HVc to participate in multiple roles during song production,
conspecific song recognition, and possibly memory consolidation during sleep.
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