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Confusion matrix of decoding vowels for covert speech.
| Accuracy (%) | /ε/ | /æ/ | /i:/ | /u:/ |
|---|---|---|---|---|
| /ε/ | 40.49±12.32 | 19.16±4.01 | 19.01±6.09 | 21.33±12.76 |
| /æ/ | 27.93±6.20 | 26.63±4.72 | 23.70±6.01 | 21.74±8.71 |
| /i:/ | 22.19±9.88 | 27.03±7.96 | 28.69±7.08 | 22.09±9.98 |
| /u:/ | 20.82±9.59 | 16.00±7.76 | 20.45±9.25 | 42.72±9.35 |
