Table 2.

Effect of d-serine and DsdA on PNFP amplitude

	d-serine			DsdA
Stimulus
intensity	% Control	SEM	P	% Control	SEM	P
0.5	328.8	49.4	0.0012	109.7	4.47	0.096
1	171.6	11.8	0.0017	105.1	9.02	0.60
1.5	172.8	16.5	0.007	94.54	9.51	0.59
2	166.5	16.2	0.0094	81.12	5.33	0.017
2.5	143.2	11.9	0.015	78.04	2.58	<0.001
3	132.2	10.9	0.032	72.27	4.33	0.0014
3.5	128.0	9.3	0.030	68.04	4.93	0.0013
4	127.8	9.2	0.030	62.62	5.32	<0.001
4.5	119.4	4.0	0.0044	60.03	3.16	<0.001
5	114.6	4.8	0.028	60.49	3.32	<0.001
5.5	109.4	5.0	0.12	57.87	3.26	<0.001
6	98.33	2.66	0.56	58.00	3.47	<0.001
6.5	98.97	1.97	0.62	56.65	4.47	<0.001

PNFP amplitude after d-serine and DsdA application was compared to control at 13 different stimulus intensities. % control was calculated as d-serine or DsdA/control × 100 at each of the log intensities. Standard errors and the P values calculated using Student's t test from six experiments are reported.