Event-Related Potentials in Parkinson’s Disease Patients with Visual Hallucination
Table 3
Comparisons of latencies and amplitude at Pz in visual ERPs of PD-H, PD-NH, and controls.
PD-H
PD-NH
Controls
p
Amplitude, uV
ISI = 1600 ms
N1
0.479
P2
7.05 ± 3.81
10.87 ± 6.75
7.18 ± 5.73
0.164
N2
0.95 ± 7.77
0.388
P3
12.19 ± 4.74
14.14 ± 9.76
11.62 ± 7.86
0.934
ISI = 5000 ms
N1
0.351
P2
6.40 ± 3.40
5.83 ± 3.81
6.18 ± 4.89
0.831
N2
0.836
P3
11.18 ± 5.21
12.38 ± 8.33
13.34 ± 6.50
0.831
Latency, ms
ISI = 1600 ms
N1
140.29 ± 13.03
139.43 ± 21.83
133.73 ± 15.34
0.585
P2
183.67 ± 15.40
185.57 ± 22.67
176.60 ± 8.09
0.643
N2
277.11 ± 33.45
262.85 ± 18.26
263.92 ± 18.67
0.288
P3
366.57 ± 21.58
359.89 ± 27.89
0.005
ISI = 5000 ms
N1
152.86 ± 22.68
131.17 ± 20.25
135.63 ± 13.19
0.594
P2
215.14 ± 26.02
191.13 ± 29.20
197.11 ± 18.28
0.391
N2
282.75 ± 34.45
278.00 ± 22.94
265.17 ± 22.41
0.498
P3
397.38 ± 18.78
0.827
RT, ms
ISI = 1600 ms
434.39 ± 71.49
395.65 ± 77.05
382.70 ± 52.97
0.145
ISI = 5000 ms
0.321
Error rate
ISI = 1600 ms
0.03 ± 0.02
0.04 ± 0.05
0.19 ± 0.02
0.178
ISI = 5000 ms
0.03 ± 0.04
0.02 ± 0.02
0.02 ± 0.02
0.552
PD-H: PD patients with visual hallucinations; PD-NH: PD patients without visual hallucinations; RT: reaction time. Values are expressed as mean ± SD. p: p value, by one-way analysis of covariance (ANCOVA) with age, gender as covariate for between-group comparison and by one-way repeated measures analysis of variance (ANOVA) for within-group comparison. , PD-H versus control, Tukey method for post hoc analysis, , ISI = 5000 ms versus 1600 ms, by paired t-test.
