Redundancy reduction and sustained firing with stochastic depressing synapses

Mark S Goldman, Pedro Maldonado, L. F. Abbott

Research output: Contribution to journalArticlepeer-review

77 Scopus citations

Abstract

Many synapses in the CNS transmit only a fraction of the action potentials that reach them. Although unreliable, such synapses do not transmit completely randomly, because the probability of transmission depends on the recent history of synaptic activity. We examine how a variety of spike trains, including examples recorded from area V1 of monkeys freely viewing natural scenes, are transmitted through a realistic model synapse with activity-dependent depression arising from vesicle depletion or postrelease refractoriness. The resulting sequences of transmitted spikes are significantly less correlated, and hence less redundant, than the presynaptic spike trains that generate them. The spike trains we analyze, which are typical of those recorded in a variety of brain regions, have positive autocorrelations because of the occurrence of variable length periods of sustained firing at approximately constant rates. Sustained firing may, at first, seem inconsistent with input from depressing synapses. We show, however, that such a pattern of activity can arise if the postsynaptic neuron is driven by a fixed population of direct, "feedforward" inputs accompanied by a variable number of delayed, "reverberatory" inputs. This leads to a prediction for the number and latency distribution of the inputs that typically drive a cortical neuron.

Original languageEnglish (US)
Pages (from-to)584-591
Number of pages8
JournalJournal of Neuroscience
Volume22
Issue number2
StatePublished - Jan 15 2002
Externally publishedYes

Keywords

  • Correlation
  • Information theory
  • Natural stimuli
  • Redundancy
  • Synaptic depression
  • V1

ASJC Scopus subject areas

  • Neuroscience(all)

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