Fig. 3.

Single-level rivalry model bifurcation diagram as a function of the parameters h (hyperpolarizing current strength) and g (inhibitory strength) from Eq. 1. The region of traditional rivalry is enclosed by heavy solid and dashed lines, and the regime of F&S rivalry is demarcated by the lighter solid and dashed lines. Above the solid line for either rivalry type there is a bifurcation to a winner-take-all regime, and below the dashed line there is a bifurcation to an equilibrium state representing equal firing. The locus at which dominance intervals are 2.4 sec is marked by filled circles for traditional rivalry and open circles for F&S rivalry. F&S rivalry clearly requires significantly stronger inhibition than traditional rivalry. Within the small region of overlap (gray), F&S rivalry exhibits extremely short dominance intervals incompatible with the experimental data (see text).