Figure 4. The NAS-SC model self-connected with an autpase captures the abrupt transition between the theta and hyper-excitable regimes as the result of small changes in the maximal synaptic conductance 
.
A: Spiking frequency vs. 
for representative values of 
and 
. The spiking frequency is measured in number of spikes per second. The transition point corresponds to 
. B: Voltage traces for one representative values of 
on each side of (and close to) the transition point. The value of the persistent sodium maximal conductance is 
. The interspike intervals are 
ms (top-left) and 
ms (bottom-left). The right panels are magnifications of the left ones.