Fig. 8.

Influence of current, input frequency and treatment on the number of spikes per successful cycle. When the number of spikes per cycle is normalized to include only successful cycles, DNE cells (■) have slightly fewer spikes than control cells (○). Because there was no treatment:frequency interaction (Table 2), the treatment effect is independent of frequency. However, examination of the data clearly shows that the differences occurred only at the 2 lowest frequencies, and at the 2 highest levels of injected current. See text for further explanation.