Table 1. CSP combined with other feature classification algorithms.
| A | M | P | D | S | DE | E |
|---|---|---|---|---|---|---|
| DaSalla et al. (2009) | CSP | /a/, /u/ | Private data | 3 (2 m and 1 f/age from 26–29) | BioSemi ActiveTwo | 68–78 |
| SVM | ||||||
| Agarwal et al. (2020) | CSP | /a/, /u/, /rest/ | DaSalla et al. (2009) | 3 (2 m and 1 f/age from 26–29) | BioSemi ActiveTwo | 87.56 |
| SVM | ||||||
| Rostami & Moradi (2015) | EMBCSP | /a/, /u:/ | Private data | 5 (3 m and 2 f/age from 23–33) | N/A | Average: 89.42 |
| SVM | ||||||
| Wang et al. (2016) | CSP | Chinese character “左(Left), 壹(One)” | Private data | 10 (7 m and 3 f/age from 22–28) | SynAmps 2 | Average: 82.3 |
| SVM | ||||||
| Wang et al. (2019) | CSP, CCF, PLV SVM |
Chinese character “移(Move)” | Private data | 10 (8 m and 2 f/age from 22–28) | SynAmps 2 | Average: 74.3 |
| Zhang, Li & Chen (2020) | CSP | /ba/ | Private data | 14 (6 m and 8 f/age from 19–22) | N/A | Under combined stimuli: 80.1 |
| SVM | ||||||
| Wang et al. (2021) | CSP | Chinese character “移(Move)” | Private data | 10 (8 m and 2 f/age from 22–28) | SynAmps 2 | Average: 73.9 |
| SVM | ||||||
| Zhao, Liu & Gao (2021) | CSP, DWT SVM, ELM |
Chinese initial consonant | Private data | 8 (6 m and 2 f/ average age 23.67) | N/A | Highest: 73.04 |
| Wang et al. (2022) | CSP | Chinese character “壹(One)” | Private data | 12 (9 m and 3 f/age from 22 to 26) | Neusen W2 | Average: 68.94 |
| SVM |
Note:
A, authors; M, methods; P, pronunciation materials; D, datasets; S, subjects (number); DE, device; E, evaluation indicators (accuracy: %); m, males; f, females; CSP, common spacial pattern; SVM, support vector machine; EMBCSP, evidential multi-band common spacial pattern; CCF, cross correlation function; PLV, phase locking value; DWT, discrete wavelet transform; ELM, Extreme Learning Machine; SI, speech imagery; MI, motor imagery.