Table 1.

Effect of membrane potential on the induction of facilitation at different frequencies

Frequency	Membrane potential	R value	Slope	Increase
2 Hz	+10 mV	0.93	0.04
	+20 mV	0.96	0.11	×2.8
5 Hz	+10 mV	0.96	0.02
	+20 mV	0.98	0.05	×2.5
10 Hz	+10 mV	0.99	0.06
	+20 mV	0.97	0.09	×1.5
15 Hz	+10 mV	0.98	0.07
	+20 mV	0.97	0.09	×1.3

Values in the last three columns were calculated from the first 20 stimuli at the indicated frequency and membrane potential (Fig. 3A2). Plots of these data were linear and had the indicated slope. The last column is the ratio of the +20 mV slope/+10 mV slope at the indicated frequency.