Table 1 Comprehensive dataset characteristics and recording parameters.
Demographics & configuration | Technical specifications | ||
|---|---|---|---|
Parameter | Value | Parameter | Value |
Participants (M/F) | 15 (8/7) | Sampling frequency | 250 Hz |
Age range | 21–28 years | A/D resolution | 24-bit |
Mean age ± SD | 24.3 ± 3.2 years | Online filtering | 1–50 Hz |
Handedness (LQ) | Right (> 0.7) | Dynamic range | \(\approx\) 144.5 dB |
MMSE score | \(\ge\) 27 points | Electrode impedance | < 5 k\(\Omega\) |
BDI score | < 10 points | Reference electrode | Linked mastoids |
Total electrodes | 64 channels | Motor electrodes | 22 channels |
Positioning system | Extended 10-20 | Ground electrode | AFz |
Experimental design | Timing & quality metrics | ||
|---|---|---|---|
Parameter | Value | Parameter | Value |
MI classes | 4 (LH, RH, feet, tongue) | Fixation period | 2.0 s |
Sessions/participant | 6 sessions | Cue presentation | 1.0 s |
Trials/session | 48 trials | MI execution | 4.0 s |
Trials/class/session | 12 trials | Inter-trial interval | 2.0 s |
Total trials/participant | 288 trials | Total trial duration | 9.0 s |
Total dataset size | 4,320 trials | Â | Â |
Quality criteria met | 96.3% (4,160/4,320) | Avg. SNR | 18.7 ± 4.2 dB |
Class balance | Perfect (25% each) | Artifact rate | 3.7% |
