Delays in activity-based neural networks

S Coombes, C Laing - Philosophical Transactions of the …, 2009 - royalsocietypublishing.org
Philosophical Transactions of the Royal Society A …, 2009royalsocietypublishing.org
In this paper, we study the effect of two distinct discrete delays on the dynamics of a Wilson–
Cowan neural network. This activity-based model describes the dynamics of synaptically
interacting excitatory and inhibitory neuronal populations. We discuss the interpretation of
the delays in the language of neurobiology and show how they can contribute to the
generation of network rhythms. First, we focus on the use of linear stability theory to show
how to destabilize a fixed point, leading to the onset of oscillatory behaviour. Next, we show …
In this paper, we study the effect of two distinct discrete delays on the dynamics of a Wilson–Cowan neural network. This activity-based model describes the dynamics of synaptically interacting excitatory and inhibitory neuronal populations. We discuss the interpretation of the delays in the language of neurobiology and show how they can contribute to the generation of network rhythms. First, we focus on the use of linear stability theory to show how to destabilize a fixed point, leading to the onset of oscillatory behaviour. Next, we show for the choice of a Heaviside nonlinearity for the firing rate that such emergent oscillations can be either synchronous or anti-synchronous, depending on whether inhibition or excitation dominates the network architecture. To probe the behaviour of smooth (sigmoidal) nonlinear firing rates, we use a mixture of numerical bifurcation analysis and direct simulations, and uncover parameter windows that support chaotic behaviour. Finally, we comment on the role of delays in the generation of bursting oscillations, and discuss natural extensions of the work in this paper.
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