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

Table 3 Results of the users’ performance in the virtual navigation session

Participant	Time lapse		Failed commands				IC changes	Classification matrix’s measures
Participant	Absolute	Relative	F	R	L	Total	IC changes	Recall	Specificity	Precision	NPV	Accuracy
	Virtual navigation task 1: visual-auditory interface
A1	215	1.09	0	0	0	0	0	.94	1.00	1.00	.92	.97
A2	381	1.92	2	0	11	13	0	.85	.67	.57	.90	.73
A6	432	2.18	1	0	0	1	1	.81	.96	.94	.85	.89
A8	312	1.80	1	0	7	8	0	.89	.65	.68	.88	.76
A9	294	1.48	0	1	1	2	0	.94	.86	.89	.92	.91
A12	284	1.43	1	0	2	3	0	.94	.75	.85	.90	.87
B13	413	1.78	1	0	2	3	1	.63	.92	.85	.78	.80
B14	392	1.98	2	1	0	3	0	.81	.80	.85	.75	.81
B15	284	1.43	0	0	4	4	0	1.00	.67	.81	1.00	.86
Average	334 ± 73	1.68 ± 0.34	0.89 ± 0.78	0.22 ± 0.44	3.00 ± 3.78	4.11 ± 4.01	0.22 ± 0.44	.87 ± .11	.81 ± .13	.83 ± 13	.88 ± .08	.84 ± .08
	Virtual navigation task 2: auditory interface
A1	246	1.24	2	0	0	2	0	.89	.86	.89	.86	.88
A2	513	2.59	0	6	25	31	0	1.00	.39	.35	1.00	.54
A6	410	2.09	1	3	3	7	0	.89	.63	.71	.86	.76
A8	251	1.27	0	1	1	2	0	1.00	.80	.89	1.00	.93
A9	303	1.53	2	0	0	2	0	.85	.85	.89	.79	.85
A12	278	1.40	0	1	0	1	0	.94	.92	.94	.92	.93
B13	644	3.25	4	0	0	4	8	.41	.95	.81	.76	.76
B15	252	1.27	0	0	1	1	0	1.00	.89	.94	1.00	.96
Average	362 ± 148	1.83 ± 0.75	1.13 ± 1.48	1.38 ± 2.13	3.75 ± 8.65	6.25 ± 10.20	1 ± 2.83	.75 ± .36	.79 ± .19	.80 ± .20	.90 ± .10	.83 ± .14

The Relative time is calculated by comparing the Absolute Time and the time obtained on a reference path in which, once a selection is made, the NC interface is presented for the selection of a new command (in this way, a subject can only make one selection per IC interface)

ISSN: 1743-0003