Table 2 Means and standard deviations (SD) of components of event-related potentials
Dependent variable | Condition | Mean ± SD | Statistical values of one-way ANOVA | Significance |
|---|---|---|---|---|
P1 latency (ms) | 1.0 s | 103.0 ± 10.4 | F 2,24 = 1.2 | N.S |
1.5 s | 103.2 ± 11.4 | |||
2.0 s | 102.1 ± 10.5 | |||
N1 latency (ms) | 1.0 s | 156.6 ± 9.7 | F 2,24 = 1.2 | N.S |
1.5 s | 157.7 ± 12.4 | |||
2.0 s | 154.7 ± 12.4 | |||
P1-N1 amplitude (μV) | 1.0 s | 8.2 ± 4.0 | F 2,24 = 0.2 | N.S |
1.5 s | 8.3 ± 3.4 | |||
2.0 s | 8.7 ± 3.8 | |||
N2 latency (ms) | 1.0 s | 265.7 ± 26.7 | F 2,24 = 0.6 | N.S |
1.5 s | 263.1 ± 26.3 | |||
2.0 s | 265.8 ± 24.0 | |||
N2 amplitude (μV) | 1.0 s | 3.4 ± 5.2 | F 2,24 = 0.8 | N.S |
1.5 s | 3.4 ± 4.5 | |||
2.0 s | 2.4 ± 4.1 | |||
Latency of the first P3 peak (ms) | 1.0 s | 409.6 ± 27.8 | F 1,15 = 0.8 | N.S |
1.5 s | 413.5 ± 41.3 | |||
2.0 s | 407.7 ± 30.4 | |||
Amplitude of the first P3 peak (μV) | 1.0 s | 15.8 ± 4.7 | F 2,24 = 4.8 | p <0.05 |
1.5 s | 13.5 ± 6.3a | |||
2.0 s | 15.8 ± 5.9b | |||
The slope of the P3 waveform in the 100 ms before the first peak | 1.0 s | -0.13 ± 0.05 | F 2,24 = 2.4 | N.S |
1.5 s | -0.10 ± 0.04 | |||
2.0 s | -0.12 ± 0.05 | |||
The slope of the P3 waveform in the 100 ms after the first peak | 1.0 s | 0.07 ± 0.04 | F 2,24 = 4.4 | p <0.05 |
1.5 s | 0.04 ± 0.07a | |||
2.0 s | 0.04 ± 0.03a | |||
The percentage of subjects with bimodal P3 peaks (%) | 1.0 s | 23.1 | Q 1 =4.5 | p <0.05 |
1.5 s | 46.2 | |||
2.0 s | 69.2a | |||