Research article summary (published 8 Jun 2009):

Inhibition and recurrent excitation in a computational model of sparse bursting in song nucleus HVC.

Full Abstract

The telencephalic premotor nucleus HVC is situated at a critical point in the pattern-generating premotor circuitry of oscine songbirds. A striking feature of HVC's premotor activity is that its projection neurons burst extremely sparsely. Here we present a computational model of HVC embodying several central hypotheses: 1) sparse bursting is generated in bistable groups of recurrently connected robust nucleus of the arcopallium (RA)-projecting (HVCRA) neurons; 2) inhibitory interneurons terminate bursts in the HVCRA groups; and 3) sparse sequences of bursts are generated by the propagation of waves of bursting activity along networks of HVCRA neurons. Our model of sparse bursting places HVC in the context of central pattern generators and cortical networks using inhibition, recurrent excitation, and bistability. Importantly, the unintuitive result that inhibitory interneurons can precisely terminate the bursts of HVCRA groups while showing relatively sustained activity throughout the song is made possible by a specific constraint on their connectivity. We use the model to make novel predictions that can be tested experimentally.

Author information

Author/s: Gibb, Leif (L); Gentner, Timothy Q (TQ); Abarbanel, Henry D I (HD);

Affiliation: Neurosciences Graduate Program, Department of Psychology, Scripps Institute of Oceanography, Center for Theoretical Biological Physics, University of California, San Diego, La Jolla, CA, USA. lgibb(-atsign-)mit.edu

Grants: 2 T32 MH-20002 (Agency:NIMH NIH HHS)

Journal and publication information

Publication Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.

Journal: Journal of neurophysiology (J Neurophysiol), published in United States. (Language: eng)

Reference: 2009-Sep; vol 102 (issue 3) : pp 1748-62

Dates: Created 2009/09/03; Completed 2009/10/23;

PMID: 19515949, status: MEDLINE (last retrieval date: 10/23/2009, IMS Date: )

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Action Potentials - physiology Animals Computer Simulation High Vocal Center - cytology Interneurons - physiology Models, Neurological Nerve Net - physiology

Nerve Net - physiology Neural Inhibition - physiology Neuronal Plasticity Nonlinear Dynamics Songbirds Synapses - physiology Vocalization, Animal - physiology

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