Figure 2.

(A) Neural mass model: a population of pyramidal cells interacts with itself in an excitatory mode and with an inhibitory population of inter-neurons. (B) Block representation of the model. The g boxes account for the synaptic integration between neuronal populations. S boxes simulate cell bodies of neurons by transforming the membrane potential of a population into an output firing rate. The coefficients J_αβ are the random synaptic efficiency of population β on population α (1 represents the pyramidal population, 2 the excitatory feedback, and 3 the inhibitory inter-neurons).