Figure 8. Theoretical change in discharge frequency for a Poisson-type generator process following an increase in event rate and following an increase in threshold requirements of 5 %.

A, theoretical spiking frequency as event rate is increased for processes characterized by a threshold value of 2, 10, 20 and 40 events. The lower of each pair is the theoretical discharge frequency following an increase in threshold levels of 5 % (2.1, 11.55, 21 and 42). B, ratio of the discharge rate before and following an increase in threshold requirements of 5 %. Note that the sensitivity to an increase in threshold requirements increases as the threshold and event rate increase.