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

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

Participant Time lapse Selected commands Classification matrix’s measures
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
  1. 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