Causal interactions and delays in a neuronal ensemble
  We analyze a neural system which mimics a sensorial cortex, with different input characteristics, in presence of transmission delays. We propose a new measure to characterize collective behavior, based on the nonlinear extension of the concept of Granger causality, and an interpretation is given of the variation of the percentage of the causally relevant interactions with transmission delays. 
Daniele Marinazzo, Mario Pellicoro, Sebastiano Stramaglia