English: Illustration of the two-state neuronal model implemented in Dynamic Causal Model (DCM) in the SPM software package. Neuronal populations E and I are excitatory and inhibitory respectively. SE=self-excitation, SI=self-inhibition, EE=excitatory to excitatory, EI=excitatory to inhibitory, IE=inhibitory to excitatory.
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Update nomenclature to match SPM code and the original paper: IE = intrinsic inhibitory to excitatory EE = extrinsic excitatory to excitatory EI = intrinsic excitatory to inhibitory SE = intrinsic self-inhibition (excitatory) SI = intrinsic self-inhib...