Computational Intelligence and Neuroscience / 2017 / Article / Tab 3

Research Article

Mental Task Evaluation for Hybrid NIRS-EEG Brain-Computer Interfaces

Table 3

Top five features for the five best task pairs of each modality combination, using the average absolute values of the SVM weights as ranking metric. The models trained on the best performing one-second window were used (three to four seconds after stimulus onset for EEG-only and 11 to 12 seconds for NIRS-only and fusion of signals).
(a) EEG only

ROT-MIROT-FACEROT-SINGSUB-MISING-SUB

pwr_high_alpha_O2pwr_high_alpha_O2pwr_t4_30_P8pwr_high_alpha_PO7pwr_alpha/beta_PO8
pwr_low_alpha_CP6pwr_t4_30_P10pwr_t4_30_O2pwr_alpha/beta_Izpwr_total_PO7
pwr_high_alpha_CP6pwr_alpha/beta_O1pwr_high_alpha_PO8pwr_total_PO8pwr_high_alpha_Iz
pwr_high_alpha_O1pwr_high_alpha_PO7pwr_t4_30_P10pwr_theta/beta_O2pwr_total_PO8
pwr_t4_30_P8pwr_low_beta_P7pwr_alpha/beta_PO8pwr_theta/beta_P9pwr_total_P7

(b) NIRS only

ROT-MIROT-SINGROT-FACESUB-MIROT-WORD

mean_S15-D1_HbOmean_S15-D1_HbOmean_S15-D1_HbOmean_S14-D22_HbRmean_S15-D5_HbO
mean_S10-D17_HbRmean_S1-D2_HbTmean_S10-D14_HbOmean_S15-D1_HbRmean_S13-D24_HbR
mean_S1-D2_HbTmean_S6-D9_HbRmean_S3-D6_HbRmean_S15-D5_HbTmean_S16-D17_HbR
mean_S13-D24_HbRmean_S13-D22_HbRmean_S10-D17_HbOmean_S15-D1_HbOmean_S13-D22_HbO
mean_S14-D24_HbRmean_S14-D24_HbRmean_S10-D17_HbRmean_S1-D1_HbOmean_S13-D24_HbO

(c) EEG-NIRS fusion

ROT-FACEROT-MIROT-SINGSUB-MISING-SUB

mean_S15-D1_HbOpwr_theta/beta_O2mean_S15-D1_HbOmean_S14-D22_HbRpwr_high_alpha_O2
pwr_t4_30_O2pwr_high_alpha_O1pwr_high_alpha_O2pwr_high_alpha_PO7pwr_t4_30_P9
pwr_theta/beta_O2pwr_t4_30_O2pwr_t4_30_P9pwr_t4_30_O2pwr_high_alpha_P10
pwr_theta/beta_PO7pwr_t4_30_PO8pwr_t4_30_O2pwr_high_alpha_O2mean_S15-D1_HbO
pwr_high_alpha_PO8mean_S14-D24_HbRpwr_theta/beta_O1pwr_high_alpha_PO8pwr_low_alpha_P9

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