FIGURE 4.

Effect of potassium diffusive coupling on the synchronization of intracellular neuronal activity. With potassium lateral coupling, (a) phases of neuronal firings (activities of five neurons out of 16 are shown here) are locked and (b) the mean frequencies of the cells fall within a very narrow range (3.97∼4.04 Hz) given the parameter values used for this simulation (τ_ss = 5 ms; other parameters can be found in Table 4.) (c) The preferred phases are shown in the cyclic relative phase distribution. Without lateral diffusion coupling, (d) phases of neuronal firings keep slipping, and (e) the histogram of mean frequency values shows a pronounced peak around 4 Hz. (f) The relative phase distribution shows no local maximum around preferred phase value. For this simulation, 5 ms lateral time constant (τ_ss) and 16 cells (N) were used. The different types of lines indicate neuronal activity from different cells.