Visual-Electrotactile Stimulation Feedback to Improve Immersive Brain-Computer Interface Based on Hand Motor Imagery

Table 2

Classification accuracy (Acc) % and F1-score (F1) % of each subject (S) of both feedback (F) groups (VIS: visual, VES: visual-electrotactile stimulation) for all MI tasks (G: grasping, F/E: flexion/extension, R: random).

F	S	G		F/E		R
		Acc	F1	Acc	F1	Acc	F1
V; I; S	1	80.00	83.33	80.00	80.00	90.00	90.91
	2	85.00	82.35	80.00	83.33	90.00	90.00
	3	85.00	85.71	100.00	100.00	85.00	86.96
	4	90.00	90.91	90.00	90.00	85.00	85.71
	5	90.00	88.89	95.00	95.24	90.00	90.91
	6	95.00	94.74	95.00	94.74	90.00	90.00
	7	85.00	86.96	90.00	88.89	95.00	94.74
	8	85.00	86.96	100.00	100.00	85.00	86.96
	9	90.00	90.00	95.00	94.74	75.00	76.19
	10	90.00	88.89	90.00	90.00	80.00	75.00
	Mean	87.50	87.87	91.50	91.69	86.50	86.74
	SD	4.25	3.66	7.09	6.58	5.80	6.41
V; E; S	11	90.00	88.89	90.00	90.91	90.00	90.91
	12	100.00	100.00	100.00	100.00	100.00	100.00
	13	95.00	95.24	100.00	100.00	95.00	95.24
	14	90.00	88.89	100.00	100.00	80.00	75.00
	15	90.00	88.89	95.00	95.24	70.00	62.50
	16	95.00	95.24	95.00	95.24	75.00	73.68
	17	95.00	95.24	90.00	88.89	80.00	80.00
	18	90.00	90.00	100.00	100.00	70.00	76.92
	19	90.00	90.00	85.00	84.21	95.00	94.74
	20	95.00	94.74	95.00	94.74	100.00	100.00
	Mean	93.00	92.71	95.00	94.92	85.50	84.90
	SD	3.50	3.87	5.27	5.48	11.89	12.95