Table 3.

Primary afferent evoked EPSPs in laminae II–III neurons

	Type of EPSPs	n =	Latency (msec)	Peak amplitude (mV)	EPSP slope (dV/dT)	Number of peaks
Lamina II
Control	Low-threshold mono	1	2.1	14.5	8.5	1.0
	Low-threshold poly	6	—	13.7 ± 2.8	—	2.8 ± 1.2
	High-threshold mono	27	2.4 ± 1.2	11.8 ± 3.7	6.3 ± 2.7	1.2 ± 0.4
	High-threshold poly	2	—	16.1 ± 2.9	—	2.5 ± 0.7
Axotomy	Low-threshold mono	13	1.9 ± 0.5	15.5 ± 4.0**	11.7 ± 3.6***	2.3 ± 1.4*
	Low-threshold poly	18	—	20.3 ± 6.6	—	2.9 ± 1.0
	High-threshold mono	19	2.5 ± 1.1	11.9 ± 4.3	7.1 ± 2.8	1.4 ± 0.5
	High-threshold poly	2	—	17.6 ± 3.9	—	2.5 ± 0.7
Lamina III
Control	Low-threshold mono	16	1.8 ± 0.3	17.5 ± 2.6	14.0 ± 2.2	2.9 ± 1.5
	Low-threshold poly	7	—	17.3 ± 2.6	—	2.4 ± 0.5
	High-threshold poly	3	—	18.7 ± 2.2	—	2.3 ± 0.6
Axotomy	Low-threshold mono	15	1.7 ± 0.3	17.1 ± 1.7	12.5 ± 2.6	2.6 ± 1.6
	Low-threshold poly	6	—	16.4 ± 2.6	—	2.8 ± 0.8
	High-threshold poly	1	—	16.2	—	2.0

Data are presented as mean ± SD. Low-threshold EPSPs were evoked at relatively low-intensity stimulation (<20 V, 100 msec). High-threshold EPSPs were evoked at relatively high-intensity stimulation (40–80 V, 100 msec). p values were calculated using the Student's t test; *p < 0.05; **p < 0.01; ***p < 0.001; in comparison of monosynaptic EPSPs in axotomy versus high-threshold monosynaptic EPSPs in control.