Table 1.

Effect of genotype on VEP latency and amplitude in naive PN75 Npc1 ^+/+ and Npc1 ^−/− mice^a

	Npc1 +/+ (n = 12)	Npc1 −/− (n = 12)	t	(df) b	p c
Latency, N1	27.59 ± 0.16d	28.98 ± 0.59	2.29	(22)	0.0396
Latency, N2	35.08 ± 0.62	37.35 ± 0.55	2.75	(22)	0.0118
Latency, N3	43.37 ± 0.81	44.70 ± 0.85	1.14	(22)	0.2778
Amplitude, N1	105.20 ± 13.67	22.00 ± 6.32	5.52	(22)	0.0001

^aThe mice examined in this experiment did not receive any kind of experimental manipulation before electrode implants and VEP recording

^bDegree of freedom

^c p was evaluated by unpaired two-tailed Student’s t test

^dmean ± SEM