Summation of spatiotemporal input patterns in leaky integrate-and-fire neurons: application to neurons in the cochlear nucleus receiving converging auditory nerve fiber input.

Full Abstract

The response of leaky integrate-and-fire neurons is analyzed for periodic inputs whose phases vary with their spatial location. The model gives the relationship between the spatial summation distance and the degree of phase locking of the output spikes (i.e., locking to the periodic stochastic inputs, measured by the synchronization index). The synaptic inputs are modeled as an inhomogeneous Poisson process, and the analysis is carried out in the Gaussian approximation. The model has been applied to globular bushy cells of the cochlear nucleus, which receive converging inputs from auditory nerve fibers that originate at neighboring sites in the cochlea. The model elucidates the roles played by spatial summation and coincidence detection, showing how synchronization decreases with an increase in both frequency and spatial spread of inputs. It also shows under what conditions an enhancement of synchronization of the output relative to the input takes place.

Author information

Author/s: Kuhlmann, Levin (L); Burkitt, Anthony N (AN); Paolini, Antonio (A); Clark, Graeme M (GM);

Affiliation: Department of Otolaryngology, The University of Melbourne, Royal Victorian Eye and Ear Hospital, 32 Gisborne Street, East Melbourne, VIC 3002, Australia.

Journal and publication information

Publication Type: Journal Article; Research Support, Non-U.S. Gov't

Journal: Journal of computational neuroscience (J Comput Neurosci), published in United States. (Language: eng)

Reference: -2002 Jan-Feb; vol 12 (issue 1) : pp 55-73

Dates: Created 2002/04/04; Completed 2002/06/25; Revised 2006/11/15;

PMID: 11932560, status: MEDLINE (last retrieval date: 2/18/2009, IMS Date: )

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