Brain-Computer Interface application: auditory serial interface to control a two-class motor-imagery-based wheelchair

Table 4 Results of the users’ performances in the real navigation session

Participant	Time lapse		Selected commands							Classification matrix’s measures
Participant	Absolute (s)	Relative	F	B	R	L	Correct	Incorrect	IC changes	Recall	Specificity	Precision	NPV	Accuracy
	Real navigation task 1
A1	236	0.60	11	0	2	2	15	0	0	1.00	1.00	1.00	1.00	1.00
A2	694	1.77	11	1	5	5	16	6	2	.64	.88	.73	.84	.81
A6	674	1.72	12	1	11	4	20	8	0	.87	.68	.71	.85	.77
A8	1111	2.84	12	2	4	4	18	4	5	.55	.95	.82	.83	.82
A9	1094	2.80	17	2	13	10	27	15	1	.77	.69	.64	.80	.72
A12	568	1.45	12	0	7	6	19	6	0	.83	.79	.76	.85	.80
B13	346	0.75	13	0	3	2	17	1	0	.94	.95	.94	.95	.95
B14	489	1.06	14	0	2	2	17	1	0	.89	.95	.94	.90	.92
B15	895	1.94	16	3	8	6	24	9	3	.75	.81	.73	.83	.78
Average	679 ± 308	1.66 ± 0.8	12.5 ± 2.26	1 ± 0.89	7 ± 4.24	5.17 ± 2.71	19.17 ± 4.26	6.5 ± 4.97	1.33 ± 1.97	.80 ± .14	.86 ± .12	.81 ± .13	.87 ± .07	.84 ± .09
	Real navigation task 2
A1	422	0.90	12	0	6	9	21	6	0	.95	.67	.78	.92	.83
A2	922	1.96	10	3	9	7	16	13	2	.62	.81	.55	.85	.76
A6	677	1.44	12	3	10	8	25	8	0	.93	.68	.76	.89	.81
A12	942	2.00	16	1	12	6	26	9	2	.79	.80	.74	.84	.80
B13	438	0.81	13	1	5	2	19	2	0	.95	.93	.90	.96	.94
B14	500	0.93	14	0	3	5	20	2	0	.95	.89	.91	.94	.93
Average	650 ± 236	1.34 ± 0.54	12.5 ± 2.52	1.75 ± 1.5	9.25 ± 2.5	7.5 ± 1.29	22 ± 4.55	9 ± 2.94	1 ± 1.15	.87 ± .14	.80 ± .11	.77 ± .13	.90 ± .05	.85 ± .07

Subjects B13, B14, and B15 followed a different path from that described. In fact, this path was the same as that used in the virtual navigation session, requiring two more F commands. Therefore, these results were not taken into account when calculating the averages of the non-relative variables such as the Absolute Time lapse and the selected commands

ISSN: 1743-0003