title: Emergence and coherence of oscillations in star networks of stochastic excitable elements.
abstract: We study the emergence and coherence of stochastic oscillations in star networks of excitable elements in which peripheral nodes receive independent random inputs. A biophysical model of a distal branch of sensory neuron in which peripheral nodes of Ranvier are coupled to a central node by myelinated cable segments is used along with a generic model of networked stochastic active rotators. We show that coherent oscillations can emerge due to stochastic synchronization of peripheral nodes and that the degree of coherence can be maximized by tuning the coupling strength and the size of the network. Analytical results are obtained for the strong-coupling regime of the active rotator network. In particular, we show that in the strong-coupling regime, the network dynamics can be described by an effective single active rotator with rescaled parameters and noise.
authors.affiliation: Department of Physics, Humboldt-Universität zu Berlin, Newtonstrasse 15, 12489 Berlin, Germany.
authors.forename: Justus A
authors.initials: JA
authors.lastname: Kromer
authors.affiliation: Department of Physics, Humboldt-Universität zu Berlin, Newtonstrasse 15, 12489 Berlin, Germany.|Bernstein Center for Computational Neuroscience, Berlin, Germany.
authors.forename: Lutz
authors.initials: L
authors.lastname: Schimansky-Geier
authors.affiliation: Department of Physics and Astronomy and Neuroscience Program, Ohio University, Athens, Ohio 45701, USA.
authors.forename: Alexander B
authors.initials: AB
authors.lastname: Neiman