Fig 1. Network connectivity.
A: Schematic of an assembly i consisting of an excitatory (Ei) and an inhibitory (Ii) population. Red and blue lines indicate excitatory and inhibitory connections, respectively. The symbols w and −kw denote total synaptic couplings between populations. B: Sketch of network connectivity. The inhomogeneous network is randomly connected with connection probability prand. A feedforward structure consisting of 10 assemblies (only i − 1 and i shown) is embedded into the network. Each assembly is formed by recurrently connecting its neurons with probability prc. Subsequent assemblies are connected with feedforward probability pff between their excitatory neurons. C: Embedded structure as a function of connectivities.