Table 1.

Quantal parameters of synaptic transmission between CA1 PCs and INs as determined with a failure method and a simple binomial model

		Beginning of the train (low P_r condition)				End of the train (High P_r condition)
Cells	Cell type	Measured failure rate	Measured potency (pA)	Calculated P_r	Calculated q (pA)	Measured failure rate	Measured potency (pA)	Calculated P_r	Calculated q (pA)	Calculated N_F(f)	Measured N_EM	N_EM/N_F(f)	P_r ratio	EPSC facilitation
AB312	O-Bi	0.22	56.7	0.39	37.3	0.04	78.3	0.67	37.7	3	4	1.33	1.7	1.7
AB375	ND										6
AB376	ND	0.67	18.3			0.10	38.8			∞				5.9
AB377	O-LM	0.81	33.7	0.10	32.0	0.20	42.9	0.55	31.1	2	3	1.50	5.5	5.4
AB378	ND										1
AB383	O-LM	0.82	31.6	0.06	29.6	0.06	54.9	0.60	28.5	3			9.3	9.0
AB390	ND	0.83	30.6	0.09	29.2	0.29	39.2	0.46	30.2	2	1	0.50	5.1	5.2
AB534	ND	0.57	17.0	0.13	13.9	0.11	27.0	0.43	14.1	4			3.2	3.3
AB537	O-Bi	0.87	102.6	0.07	99.2	0.34	126.9	0.42	100.3	2			6.3	6.4
AB544	O-LM	0.61	17.8	0.09	14.7	0.05	35.6	0.45	15.1	5	2	0.40	4.7	4.9
AB545	ND	0.59	69.8	0.23	61.8	0.13	94.7	0.64	64.4	2			2.8	2.9
Mean		0.67	42.01	0.15	39.72	0.15	59.81	0.53	40.19	2.88	2.83	0.93	4.83	4.95
SEM		0.07	9.68	0.04	10.00	0.04	11.12	0.04	10.21	0.40	0.79	0.28	0.84	0.71
n		9	9	8	8	9	9	8	8	8	6	4	8	9

Potency, Mean postsynaptic response excluding failures; ND, not determined. Pairs for which only N_EM is shown (AB375 and AB378) were monosynaptically connected and exhibited short-term facilitation but failed to pass all of our criteria for detailed functional analysis. Some measured parameters for these pairs are as follows. For AB375, low P_r:P_f = 0.61, potency = 21.0 pA; high P_r:P_f = 0.14, potency = 36.4 pA; EPSC facilitation = 3.9. For AB378, low P_r:P_f = 0.88, potency = 21.3 pA; high P_r:P_f = 0.60, potency = 22.3 pA; EPSC facilitation = 3.4.