Effect of small-world topology on wave propagation on networks of   excitable elements
  We study excitation waves on a Newman-Watts small-world network model of coupled excitable elements. Depending on the global coupling strength, we find differing resilience to the added long-range links and different mechanisms of propagation failure. For high coupling strengths, we show agreement between the network and a reaction-diffusion model with additional mean-field term. Employing this approximation, we are able to estimate the critical density of long-range links for propagation failure. 
Thomas Isele, Eckehard Sch\"oll
nlin.PS math.DS