Table 1.

Latencies for patients and controls for Experiments 1 and 2

Experiment 1: contrast response			Experiment 2: spatial frequency
	Controls (n = 16)	Patients (n = 22)		Controls (n = 16)	Patients (n = 18)
C1			C1
64% contrast	101.6 ± 2.3	103.7 ± 1.8	LSF	81.5 ± 2.8	91.2 ± 3.7*
32% contrast	108.7 ± 2.3	110.7 ± 2.4	HSF	91.5 ± 2.2	93.3 ± 3.4
16% contrast	119.7 ± 2.6	119.9 ± 2.1
8% contrast	130.9 ± 2.9	130.2 ± 2.3
P1			P1
64% contrast	88.2 ± 1.6	88.2 ± 1.8	R: LSF	130.8 ± 2.6	139.3 ± 3.9
32% contrast	92.0 ± 1.6	92.0 ± 2.0	R: HSF	148.5 ± 2.5	158.0 ± 3.1*
16% contrast	96.8 ± 1.9	95.3 ± 1.8
8% contrast	105.8 ± 2.4	106.2 ± 2.3	L: LSF	136.5 ± 2.7	142.0 ± 3.5
4% contrast	114.4 ± 2.2	118.7 ± 1.7	L: HSF	150.9 ± 2.5	157.2 ± 3.0
N1			N1
64% contrast	137.7 ± 2.7	142.8 ± 2.4	R: LSF	183.5 ± 2.3	171.8 ± 3.5
32% contrast	152.7 ± 2.6	155.9 ± 2.4	R: HSF	187.0 ± 4.7	183.1 ± 4.8
16% contrast	155.0 ± 2.6	156.3 ± 2.1
8% contrast	163.7 ± 1.9	163.9 ± 2.4	L: LSF	184.1 ± 2.2	177.2 ± 3.2
4% contrast	187.7 ± 2.4	191.8 ± 2.4	L: HSF	186.8 ± 4.8	192.7 ± 3.8

Mean ± SEM. For Experiment 1, latencies for right and left hemispheres were averaged for P1 and N1 because ANCOVA did not show any significant main effect of hemisphere for either component (P1: F = 1.6, d.f. = 1, 36, P = 0.21; N1: F = 1.3, d.f. = 1, 36, P = 0.26). For Experiment 2, latencies for right and left hemisphere are given separately because there was a main effect for hemisphere for the P1 and N1 components.

^*P < 0.05.