Effects of Poisson noise in a IF model with STDP and spontaneous replay of periodic spatiotemporal patterns,in absence of cue stimulation |
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Authors: | Silvia Scarpetta Ferdinando Giacco Fabrizio Lombardi Antonio de Candia |
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Affiliation: | 1. Department of Physics ‘E. R. Caianiello’, University of Salerno, 84084 Fisciano (SA), Italy;2. INFN Unita’ di Napoli Gruppo coll. di Salerno, Italy;3. Department of Mathematics and Physics, Second University of Naples, 81100 Caserta, Italy;4. Institute of Computational Physics for Engineering Materials, ETH, Zurich, Switzerland;5. Department of Physics, University Federico II, CNR-SPIN and INFN, Napoli, Italy |
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Abstract: | We consider a network of leaky integrate and fire neurons, whose learning mechanism is based on the Spike-Timing-Dependent Plasticity. The spontaneous temporal dynamic of the system is studied, including its storage and replay properties, when a Poissonian noise is added to the post-synaptic potential of the units. The temporal patterns stored in the network are periodic spatiotemporal patterns of spikes. We observe that, even in absence of a cue stimulation, the spontaneous dynamics induced by the noise is a sort of intermittent replay of the patterns stored in the connectivity and a phase transition between a replay and non-replay regime exists at a critical value of the spiking threshold. We characterize this transition by measuring the order parameter and its fluctuations. |
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Keywords: | Neural criticality STDP Associative memory |
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