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Front Comput Neurosci. 2009 Jul 30;3:9. doi: 10.3389/neuro.10.009.2009. eCollection 2009.

Made-to-order spiking neuron model equipped with a multi-timescale adaptive threshold.

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1
Department of Human and Computer Intelligence, Ritsumeikan University Shiga, Japan.

Abstract

Information is transmitted in the brain through various kinds of neurons that respond differently to the same signal. Full characteristics including cognitive functions of the brain should ultimately be comprehended by building simulators capable of precisely mirroring spike responses of a variety of neurons. Neuronal modeling that had remained on a qualitative level has recently advanced to a quantitative level, but is still incapable of accurately predicting biological data and requires high computational cost. In this study, we devised a simple, fast computational model that can be tailored to any cortical neuron not only for reproducing but also for predicting a variety of spike responses to greatly fluctuating currents. The key features of this model are a multi-timescale adaptive threshold predictor and a nonresetting leaky integrator. This model is capable of reproducing a rich variety of neuronal spike responses, including regular spiking, intrinsic bursting, fast spiking, and chattering, by adjusting only three adaptive threshold parameters. This model can express a continuous variety of the firing characteristics in a three-dimensional parameter space rather than just those identified in the conventional discrete categorization. Both high flexibility and low computational cost would help to model the real brain function faithfully and examine how network properties may be influenced by the distributed characteristics of component neurons.

KEYWORDS:

adaptive threshold; brain simulator; cortical neuron; fluctuating input; leaky integrate-and-fire model; parameter optimization; predicting spike times

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