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

Table 5

Spearman correlations () between the system perception levels (O: ownership, A: attention, D: difficulty) and the channel’s relative power in the -and central (C) -bands for the grasping (G) and flexion/extension (F/E) MI tasks.

MI task	Band	Channel	Level
G		FC3	O	−0.46	0.0419
		AF3	A	0.52	0.0193
		CP3	A	0.45	0.0493
		AF3	D	−0.49	0.0272
		CP3	D	−0.61	0.0044
		O1	D	−0.47	0.0388
	C.	AF3	A	0.58	0.0077
		AF3	D	−0.48	0.0309
		CP3	D	−0.62	0.0033
F/E		AF3	A	0.51	0.0221
		AF3	D	−0.54	0.0135
		FCz	D	−0.47	0.0350
		CP3	D	−0.67	0.0011
		O1	D	−0.46	0.0433
	C.	AF3	A	0.57	0.0082
		CP3	A	0.49	0.0278
		AF3	D	−0.50	0.0246
		CP3	D	−0.64	0.0023