Discrete and Continuous Dynamical Systems - Series A (DCDS-A)

Stable and unstable periodic orbits in complex networks of spiking neurons with delays

Pages: 1555 - 1588, Volume 28, Issue 4, December 2010      doi:10.3934/dcds.2010.28.1555

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Raoul-Martin Memmesheimer - Center for Brain Science, Faculty of Arts and Sciences, Harvard University, Cambridge, MA, United States (email)
Marc Timme - Network Dynamics Group, Max Planck Institute for Dynamics & Self-Organization (MPIDS), Göttingen, Bernstein Center for Computational Neuroscience (BCCN) Göttingen, Department of Physics, Georg August University, Göttingen, Germany (email)

Abstract: Is a periodic orbit underlying a periodic pattern of spikes in a heterogeneous neural network stable or unstable? We analytically assess this question in neural networks with delayed interactions by explicitly studying the microscopic time evolution of perturbations. We show that in purely inhibitorily coupled networks of neurons with normal dissipation (concave rise function), such as common leaky integrate-and-fire neurons, all orbits underlying non-degenerate periodic spike patterns are stable. In purely inhibitorily coupled networks with strongly connected topology and normal dissipation (strictly concave rise function), they are even asymptotically stable. In contrast, for the same type of individual neurons, all orbits underlying such patterns are unstable if the coupling is excitatory. For networks of neurons with anomalous dissipation ((strictly) convex rise function), the reverse statements hold. For the stable dynamics, we give an analytical lower bound on the local size of the basin of attraction. Numerical simulations of networks with different integrate-and-fire type neurons illustrate our results.

Keywords:  Spiking neural network, hybrid dynamical system, periodic orbit, stability, local cortical circuits, synchronization, attractor neural networks.
Mathematics Subject Classification:  92B20, 94C99, 34B37, 34C25.

Received: October 2009;      Revised: February 2010;      Available Online: June 2010.