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(A) Layer structure of the cortex. There are three types of inputs in this model, i.e., cholinergic projections from the NBM, glutamatergic spike volleys from higher cortical areas and the thalamic matrix circuit, and a bottom-up external input injected via layer 4 from lower cortical areas. (B) M-module structure of a model. (C) There are four types of intra-module connections and three types of inter-module connections.
