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Behavioral/Systems/Cognitive

Signal Propagation and Logic Gating in Networks of Integrate-and-Fire Neurons

Tim P. Vogels and L. F. Abbott
Journal of Neuroscience 16 November 2005, 25 (46) 10786-10795; DOI: https://doi.org/10.1523/JNEUROSCI.3508-05.2005
Tim P. Vogels
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L. F. Abbott
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Abstract

Transmission of signals within the brain is essential for cognitive function, but it is not clear how neural circuits support reliable and accurate signal propagation over a sufficiently large dynamic range. Two modes of propagation have been studied: synfire chains, in which synchronous activity travels through feedforward layers of a neuronal network, and the propagation of fluctuations in firing rate across these layers. In both cases, a sufficient amount of noise, which was added to previous models from an external source, had to be included to support stable propagation. Sparse, randomly connected networks of spiking model neurons can generate chaotic patterns of activity. We investigate whether this activity, which is a more realistic noise source, is sufficient to allow for signal transmission. We find that, for rate-coded signals but not for synfire chains, such networks support robust and accurate signal reproduction through up to six layers if appropriate adjustments are made in synaptic strengths. We investigate the factors affecting transmission and show that multiple signals can propagate simultaneously along different pathways. Using this feature, we show how different types of logic gates can arise within the architecture of the random network through the strengthening of specific synapses.

  • rate coding
  • sensory processing
  • propagation
  • integrate-and-fire neurons
  • network models
  • synfire chains
  • logic gates
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The Journal of Neuroscience: 25 (46)
Journal of Neuroscience
Vol. 25, Issue 46
16 Nov 2005
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Signal Propagation and Logic Gating in Networks of Integrate-and-Fire Neurons
Tim P. Vogels, L. F. Abbott
Journal of Neuroscience 16 November 2005, 25 (46) 10786-10795; DOI: 10.1523/JNEUROSCI.3508-05.2005

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Signal Propagation and Logic Gating in Networks of Integrate-and-Fire Neurons
Tim P. Vogels, L. F. Abbott
Journal of Neuroscience 16 November 2005, 25 (46) 10786-10795; DOI: 10.1523/JNEUROSCI.3508-05.2005
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