Quantitative and qualitative analysis of asynchronous neural activity

Quantitative and qualitative analysis of asynchronous neural activity

Blog Article

The activity of a sparse network of leaky integrate-and-fire neurons is carefully revisited with reference to a regime of bona fide asynchronous Lip Color dynamics.The study is preceded by a finite-size scaling analysis, carried out to identify a setup where collective synchronization is negligible.The comparison between quenched and annealed networks reveals the emergence of substantial differences when the coupling strength is increased, via a scenario somehow reminiscent of a phase transition.For sufficiently strong synaptic coupling, quenched networks exhibit a highly bursting neural activity, well reproduced by a self-consistent approach, based on the assumption that Locks the input synaptic current is the superposition of independent renewal processes.The distribution of interspike intervals turns out to be relatively long-tailed; a crucial feature required for the self-sustainment of the bursting activity in a regime where neurons operate, on average, (much) below threshold.

A semiquantitative analogy with Ornstein-Uhlenbeck processes helps validate this interpretation.Finally, an alternative explanation in terms of Poisson processes is offered under the additional assumption of mutual correlations among excitatory and inhibitory spikes.