TABLE II.

Parameters obtained by fitting observations of G_m at 6, 15, or 30 Hz to Eqs. 5 and 6

AP firing frequency	A1	τ1	τ1 (APs)	A2	τ2	τ2 (APs)	β	β(APs)
	µS/cm2	s		µS/cm2	s		s
6 Hz (n = 8)	−779 ± 78	66 ± 8a	199 ± 24	3,400 ± 431b	1,088 ± 79a	3,264 ± 237b	79 ± 14	238 ± 43
15 Hz (n = 18)	−809 ± 39	27 ± 1a	189 ± 10	5,426 ± 494	352 ± 12a	2,466 ± 81	34 ± 2	237 ± 12
30 Hz (n = 13)	−706 ± 50	18 ± 1a	273 ± 14	4,157 ± 575	174 ± 9a	2,611 ± 129	26 ± 2	383 ± 37

Experimental observations of G_m in AP-firing fibers were fitted to Eq. 5 and Eq. 6 to obtain parameters that describe phase 1 and phase 2, respectively. A₁ describes the reduction in G_m during phase 1, and τ₁ describes either the time required or the number of APs fired before 63% of A₁ was observed. A₂ describes the magnitude of the increase in G_m during phase 2, and τ₂ describes the time or the number of APs that was fired before G_m had risen to half of A₂. β reflects the steepness of the rise of G_m during phase 2. All data has been presented as means ± SEM.

^aAll frequencies resulted in significantly different values.

^bSignificantly different from observations at 15 and 30 Hz.