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A neuronal learning rule for sub-millisecond temporal coding

Nature volume 383, pages 76–78 (1996)Cite this article

Abstract

A PARADOX that exists in auditory and electrosensory neural systems1,2 is that they encode behaviourally relevant signals in the range of a few microseconds with neurons that are at least one order of magnitude slower. The importance of temporal coding in neural information processing is not clear yet3–8. A central question is whether neuronal firing can be more precise than the time constants of the neuronal processes involved9. Here we address this problem using the auditory system of the barn owl as an example. We present a modelling study based on computer simulations of a neuron in the laminar nucleus. Three observations explain the paradox. First, spiking of an 'integrate-and-fire' neuron driven by excitatory postsynaptic potentials with a width at half-maximum height of 250 μs, has an accuracy of 25 μs if the presynaptic signals arrive coherently. Second, the necessary degree of coherence in the signal arrival times can be attained during ontogenetic development by virtue of an unsupervised hebbian learning rule. Learning selects connections with matching delays from a broad distribution of axons with random delays. Third, the learning rule also selects the correct delays from two independent groups of inputs, for example, from the left and right ear.

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Author notes

  1. Wulfram Gerstner

    Present address: Ecole Polytechnique Federate de Lausanne, CH-1015, Lausanne, Switzerland

  2. Hermann Wagner

    Present address: RWTH Aachen, Institut fur Biologie II, Kopernikusstr. 16, D-52074, Aachen, Germany

Authors and Affiliations

  1. Physik-Department, Technische Universität; München, D-85747, Garching bei München, Germany

    Wulfram Gerstner, Richard Kempter & J. Leo van Hemmen

  2. Fakultat für Chemie und Biologie, Technische Universität; München, D-85747, Garching bei München, Germany

    Hermann Wagner

Authors
  1. Wulfram Gerstner
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  2. Richard Kempter
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  3. J. Leo van Hemmen
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  4. Hermann Wagner
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Gerstner, W., Kempter, R., van Hemmen, J. et al. A neuronal learning rule for sub-millisecond temporal coding. Nature 383, 76–78 (1996). https://doi.org/10.1038/383076a0

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