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J Neurophysiol (January 22, 2003). doi:10.1152/jn.00801.2002
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Submitted on September 12, 2002
Accepted on January 13, 2003

A Model of Song Selectivity and Sequence Generation in Area HVc of the Songbird

Patrick J. Drew1* and L. F. Abbott1

1 Volen Center for Complex Systems and Department of Biology, Brandeis University, Waltham, MA, USA

* To whom correspondence should be addressed. E-mail: drew{at}brandeis.edu.

In songbirds, nucleus HVc plays a key role in the generation of the syllable sequences that make up a song. Auditory responses of neurons in HVc are selective for single syllables and for combinations of syllables occurring in temporal sequences corresponding to those in the bird's own song. We present a model of HVc that produces syllable- and temporal-combination-selective responses on the basis of input from recorded bird songs filtered through spectral temporal receptive fields similar to those measured in field L, a primary auditory area. Normalization of the field L outputs, similar to that proposed in models of visual processing, plays an important role in the generation of syllable-selective responses in the model. For temporal-combination-selective responses, NMDA conductances provide a memory that allows inhibitory neurons to gate responses to a final syllable in a sequence on the basis of responses to earlier syllables. When the same network that produces temporal-combination-selective responses is excited by a nonspecific timing signal, it generates a similar pattern of output as it does in response to auditory song input. Thus, the same model network can perform both sensory and motor functions.




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