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

Table 4

NIRS-only peak values for each subject and task pair, when using features extracted from one-second windows. Task pairs and participants are shown in descending order of average , from top to bottom and left to right, respectively. values between 0.4 and 0.7 (satisfactory performance) are  highlighted in italic font, whereas values greater than 0.7 (high performance) are shown in bold font. The average peak time with standard deviation is also included for each task pair.

	S10	S07	S04	S11	S09	S06	S01	S05	S03	Average	Peak time (s)
ROT-SING	0.80	0.66	0.73	0.61	0.59	0.55	0.64	0.42	0.52	0.61 ± 0.11	13.28 ± 3.6
SING-SUB	0.69	0.60	0.59	0.60	0.68	0.46	0.50	0.42	0.53	0.56 ± 0.09	12.39 ± 2.6
ROT-MI	0.81	0.74	0.72	0.60	0.57	0.68	0.62	0.32	0.53	0.62 ± 0.14	12.61 ± 4.7
SUB-MI	0.83	0.60	0.57	0.72	0.77	0.57	0.57	0.33	0.42	0.60 ± 0.16	12.06 ± 2.5
ROT-NAV	0.80	0.74	0.73	0.53	0.50	0.68	0.49	0.40	0.38	0.58 ± 0.16	12.72 ± 3.0
ROT-WORD	0.89	0.66	0.76	0.63	0.62	0.55	0.58	0.42	0.28	0.60 ± 0.18	12.72 ± 2.7
SUB-FACE	0.78	0.60	0.76	0.66	0.62	0.48	0.53	0.33	0.33	0.57 ± 0.16	13.39 ± 4.2
ROT-FACE	0.80	0.51	0.84	0.53	0.48	0.66	0.70	0.48	0.18	0.58 ± 0.20	14.72 ± 3.2
WORD-SUB	0.67	0.53	0.63	0.60	0.53	0.36	0.41	0.43	0.24	0.49 ± 0.14	14.61 ± 4.9
WORD-SING	0.75	0.76	0.50	0.60	0.24	0.39	0.52	0.36	0.44	0.51 ± 0.18	13.94 ± 2.8
SUB-NAV	0.87	0.42	0.45	0.64	0.66	0.33	0.44	0.37	0.39	0.51 ± 0.18	9.94 ± 3.8
ROT-SUB	0.53	0.43	0.43	0.58	0.35	0.56	0.27	0.56	0.36	0.45 ± 0.11	13.39 ± 3.7
WORD-FACE	0.78	0.61	0.53	0.72	0.12	0.41	0.25	0.66	0.29	0.48 ± 0.23	10.50 ± 6.0
WORD-MI	0.74	0.72	0.54	0.66	0.40	0.39	0.28	0.32	0.16	0.47 ± 0.21	8.94 ± 6.7
WORD-NAV	0.84	0.74	0.44	0.53	0.34	0.33	0.31	0.28	0.28	0.45 ± 0.21	7.83 ± 5.8
SING-NAV	0.32	0.52	0.35	0.28	0.32	0.27	0.32	0.28	0.48	0.35 ± 0.09	12.94 ± 3.1
NAV-MI	0.66	0.13	0.31	0.33	0.34	0.28	0.30	0.20	0.29	0.32 ± 0.15	11.83 ± 3.2
SING-MI	0.39	0.42	0.29	0.33	0.25	0.32	0.30	0.03	0.41	0.30 ± 0.12	12.50 ± 3.2
SING-FACE	0.43	0.46	0.16	0.02	0.20	0.33	0.05	0.09	0.41	0.24 ± 0.17	6.17 ± 7.4
NAV-FACE	0.57	0.20	0.36	0.30	0.29	0.21	0.17	0.25	0.17	0.28 ± 0.13	7.39 ± 6.8
FACE-MI	0.40	0.30	0.43	0.28	0.19	0.13	0.26	0.10	0.01	0.23 ± 0.14	8.06 ± 5.2
Average	0.82	0.67	0.42	0.57	0.52	0.70	0.59	0.68	0.71	0.47 ± 0.15	11.52 ± 4.2