Fig. 9. Role of T-type Ca2+conductance on burst length. As conductance decreases, the average number of spikes in a burst also decreases from those shown in the examples of figure 1B,and less directly in figure 4A, effectively decreasing the strength of inhibitory network interactions because each spike produces a synaptic pulse of γ-aminobutyric acid (GABA) in the model. Note that as the number of spikes per burst plateaus, but decreases in Ca2+conductance continue to influence entrainment properties of the network (fig. 8,), there is a steep increase in the influence of Ca2+conductance on network coherence ( fig. 6A,), and the isobolograms ( fig. 7 ) depict some synergistic behavior. The SE of the means from three separate simulations is 0.03 spikes or less for each of the points shown.