Figure 4. Activities of model grcs and Gocs when NMDA channels of model Gocs were blocked.

Conventions are as in Fig. 2. B and C show that the grcs and Gocs elicited spikes synchronously and rhythmically during the small current injection, and that they generated spikes randomly during the large current injection. Even for the blockade of NMDA channels, the statistical features of the activity patterns of grcs during the small current injection (D and F) were the same as those shown in Figs. 2D and F . When a large current was injected, the sufficiently small amplitude of oscillation in NAC(τ) shown in E indicates that grcs elicited spikes randomly, and the constant shown in G indicates that active grc populations were almost the same.