Table 4.
EEG mean frequencies according to spectral bands in both 2-class and 5-class problem for all subjects.
| State | Delta (1–4 Hz) |
Theta (4–8 Hz) |
Alpha (8–13 Hz) |
Beta (13–30 Hz) |
Gamma (30–50 Hz) |
|
|---|---|---|---|---|---|---|
| 2-class | Alert | 1.99 Hz | 5.98 Hz | 9.86 Hz | 20.74 Hz | 36.96 Hz |
| Drowsy | 1.98 Hz | 6.22 Hz | 9.68 Hz | 19.87 Hz | 36.77 Hz | |
| Difference | 0.01 | −0.24 | 0.18 | 0.87 | 0.19 | |
| 5-class | VA | 2.19 Hz | 5.82 Hz | 9.92 Hz | 20.68 Hz | 36.59 Hz |
| FA | 2.22 Hz | 5.92 Hz | 10.01 Hz | 20.82 Hz | 37.12 Hz | |
| NAS | 2.15 Hz | 6.05 Hz | 9.84 Hz | 20.80 Hz | 37.13 Hz | |
| SNEA | 2.04 Hz | 6.17 Hz | 9.69 Hz | 20.21 Hz | 36.92 Hz | |
| VS | 2.24 Hz | 6.29 Hz | 9.70 Hz | 19.38 Hz | 36.00 Hz |