Fig. 4.

Mean field theories of neural populations are best defined as mesoscopic and thus intervene between microscopic and macroscopic scales. Based on the microscopic study of neurons and their interactions, experimental values are used to parameterise inhibitory and excitatory neurons (a) and their connectivity at intracortical (b), cortico–cortical (c) and extracortical (d) scales. Subsequently these mean values of interaction define summed physiological properties which reflect macroscopic state variables