Figure 8

Coupling parameter dependence for three populations. Left: maximum SLI and frequency of the θ-population (${\tilde{\omega }}_{C_1}=3$ Hz; top two) and the α-population (${\tilde{\omega }}_{C_1}=14$ Hz; bottom two) as functions of the coupling parameters $K_{C_2}$ and $K_{C_1}$. Right: enlargement of the marked areas. The points in the corresponding left panels C ($K_{C_2}=3.9,K_{C_1}=1.2$) and P ($K_{C_2}=3.2,K_{C_1}=1.2$) mark parameter choices that yield the max SLIs and frequencies observed in healthy subjects (controls) and schizophrenia patients, repectively. The coupling parameters from the thalamus (${\tilde{\omega }}_T=7$ Hz) to the cortex are fixed at $K_{T_1}=5.5$ and $K_{T_2}=7.0$. Solid curves mark branches of Hopf bifurcations (black) and of fold limit cycle bifurcations (gray) of the reduced system.