Table 3.
Behavioural and ERP parameters obtained from the auditory oddball task
| N | Mean | S.D. | Range | |
|---|---|---|---|---|
| Behavioural performance | ||||
| Mean hit reaction time (ms) | 118 | 542.0 | 75.7 | 345.0 – 748.6 |
| Omission errors rate (%) | 118 | 8.7 | 8.3 | 0.0 – 42.5 |
| False alarms rate (%) | 118 | 0.7 | 0.9 | 0.0 – 5.0 |
| ERP parameters a,b | ||||
| Standard condition | ||||
| N1 latency (ms) | 113 | 129.8 | 8.5 | 103.5 – 148.4 |
| N1 amplitude (µV) | 113 | −4.7 | 2.3 | −10.0 – 0.12 |
| P3b latency (ms) | 51 | 316.4 | 43.4 | 255.9 – 451.2 |
| P3b amplitude (µV) | 51 | 3.1 | 1.7 | −1.1 – 7.0 |
| Target condition | ||||
| N1 latency (ms) | 99 | 127.1 | 9.5 | 97.7 – 148.4 |
| N1 amplitude (µV) | 99 | −4.7 | 3.0 | −17.0 – 3.0 |
| P3b latency (ms) | 118 | 346.0 | 39.5 | 267.6 – 484.4 |
| P3b amplitude (µV) | 118 | 10.9 | 3.8 | 4.3 – 21.1 |
a
N1 at Cz and P3b at Pz;
b
Sample sizes vary because not all ERP components were identifiable in all the averaged waveforms.