Figure 4:

Phase locking of QIF neurons with static synapses. A. Steady-state intrinsic phase of neuron A obtained from the map Π given in equation (22) as a function of the synaptic coupling strength ${\overline{g}}_{B\to A}$. B. The relationship $g_{B\to A}=h\left({\overline{g}}_{B\to A}\right)$ between the synaptic strengths of the static map Π and the depressing map Π^dyn given in equation (26) obtained from equations (33–35). The dashed horizontal line at g_B→A = 5.35 intersects $h\left({\overline{g}}_{B\to A}\right)$ at three points (inside circles). Two of these are points that correspond to bistability in the presence of synaptic depression.