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Depending on total excitatory strength wE, a minimum proportion of the excitatory population must be active for the network to operate in an ISN regime. For a given wE, the network will only operate in an ISN regime if the effective excitatory recurrence is strong enough to lead to excitatory instability (i.e., λE > 1). Dashed line: λE = 1. Parameters: fI = 20%. X: wE = 5.4 as in Figure 4. Prop., Proportion; exc., excitatory; eig., eigenvalue.
