The Effect of Synchronized Inputs at the Single Neuron Level

Author:

Bernander Öjvind1,Koch Christof1,Usher Marius2

Affiliation:

1. Computation and Neural System Program, California Institute of Technology, Pasadena, CA 91125 USA

2. Department of Psychology, Carnegie Mellon University, Pittsburgh, PA 15213 USA

Abstract

It is commonly assumed that temporal synchronization of excitatory synaptic inputs onto a single neuron increases its firing rate. We investigate here the role of synaptic synchronization for the leaky integrate-and-fire neuron as well as for a biophysically and anatomically detailed compartmental model of a cortical pyramidal cell. We find that if the number of excitatory inputs, N, is on the same order as the number of fully synchronized inputs necessary to trigger a single action potential, Nt, synchronization always increases the firing rate (for both constant and Poisson-distributed input). However, for large values of N compared to Nt, “overcrowding” occurs and temporal synchronization is detrimental to firing frequency. This behavior is caused by the conflicting influence of the low-pass nature of the passive dendritic membrane on the one hand and the refractory period on the other. If both temporal synchronization as well as the fraction of synchronized inputs (Murthy and Fetz 1993) is varied, synchronization is only advantageous if either N or the average input frequency, fin, are small enough.

Publisher

MIT Press - Journals

Subject

Cognitive Neuroscience,Arts and Humanities (miscellaneous)

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