Table 2.
Frequency ranges obtained from median ERD/S maps (at least 0.75 s ERD of more than 20%).
| Motor imagery | Frequency ranges | C3 | Cz | C4 | |||||
|---|---|---|---|---|---|---|---|---|---|
| Electrode position | Frequency range (Hz) | Median (%) | Mean ± SD (%) | Median (%) | Mean ± SD (%) | Median (%) | Mean ± SD (%) | ||
| Left | Mu | C4 | 9.3–12.5 | 19.4 | 11.1 ± 33.3 | 6.2 | 2.4 ± 18.9 | 40.3 | 38.4 ± 18.5 |
| Beta | C4 | 23.1–23.7 | 8.5 | 16.1 ± 26.3 | 2.1 | 7.3 ± 19.1 | 31.0 | 27.5 ± 23.0 | |
| Right | Mu | C3 | 10.0–12.7 | 46.3 | 41.4 ± 18.9 | 5.9 | 9.9 ± 25.2 | 11.6 | 11.1 ± 25.1 |
| Beta | C3 | 18.9–23.2 | 24.3 | 29.0 ± 22.5 | 7.3 | 12.6 ± 19.7 | 4.8 | 12.4 ± 23.2 | |
| Foot1 | Mu | Cz | 9.7–12.62 | −10.9 | −20.6 ± 27.1 | −1.9 | 0.6 ± 25.2 | −6.5 | −9.5 ± 15.1 |
| Beta | Cz | 26.9–27.8 | 0.1 | 4.2 ± 10.2 | 17.0 | 5.1 ± 36.1 | −2.5 | 0.6 ± 10.8 | |
Applying these ranges the median, mean and standard deviation (SD) for mu and beta ERD and three different electrode positions was calculated from second 3.5 to 5.5.
1Negative values indicate an ERS.
2Frequency range for Cz mu was estimated from mu frequency ranges from C3 and Cz.