Effect of EOG Signal Filtering on the Removal of Ocular Artifacts and EEG-Based Brain-Computer Interface: A Comprehensive Study

Table 11

Classification accuracies (mean of all six runs for each subject).

Low-pass EOG filter (Hz)	Sub	Simple	Adaptive filtering		Hybrid methods
		Regression	LMS	RLS	REGICA	AIR
4	1	65.28	70.83	71.53	77.08	77.08
	2	61.11	73.61	66.67	78.47	80.56
	3	67.36	65.97	71.53	70.14	72.92
	4	64.58	66.67	69.44	69.44	71.53
	5	63.89	70.14	72.22	70.83	65.97
	6	63.19	70.14	70.83	70.83	69.44
	7	72.92	70.14	73.61	72.92	76.39
	8	66.67	72.22	67.36	72.22	70.14
	9	72.92	71.53	74.31	78.47	77.78
Mean ± SD		66.43 ± 4.11	70.13 ± 2.45	70.83 ± 2.59	73.37 ± 3.64	73.53 ± 4.71
7	1	69.44	72.92	79.17	81.25	81.25
	2	63.19	75.69	72.22	80.56	79.17
	3	73.61	72.92	72.92	75.69	75.00
	4	69.44	70.14	71.53	73.61	74.31
	5	64.58	72.22	75.69	73.61	71.53
	6	65.28	71.53	74.31	74.31	75.00
	7	73.61	76.39	76.39	76.39	79.86
	8	70.14	74.31	70.14	78.47	75.69
	9	76.39	75.00	73.61	83.33	79.86
Mean ± SD		69.52 ± 4.52	73.45 ± 2.04	73.99 ± 2.75	77.46 ± 3.59	76.85 ± 3.27
12	1	76.39	71.53	76.39	77.78	77.08
	2	57.64	71.53	70.14	72.22	75.69
	3	68.75	70.83	66.67	74.31	70.83
	4	66.67	68.75	65.28	72.92	68.06
	5	61.81	65.97	74.31	72.92	67.36
	6	61.81	69.44	75.00	72.92	73.61
	7	71.53	76.39	77.78	77.08	75.00
	8	66.67	68.75	68.06	70.83	75.69
	9	73.61	70.14	75.69	79.86	76.39
Mean ± SD		67.20 ± 6.09	70.37 ± 2.84	72.14 ± 4.65	74.53 ± 3.00	73.30 ± 3.65
UF	1	67.36	72.22	77.78	73.61	75.00
	2	65.28	70.83	68.06	70.83	75.69
	3	70.14	68.06	64.58	70.14	67.36
	4	67.36	70.14	65.97	71.53	73.61
	5	60.42	65.97	75.00	72.92	71.53
	6	63.19	66.67	70.14	73.61	71.53
	7	70.83	71.53	66.67	73.61	70.83
	8	67.36	71.53	66.67	73.61	72.92
	9	72.22	72.22	72.22	77.78	77.78
Mean ± SD		67.12 ± 3.75	69.90 ± 2.40	69.67 ± 4.48	73.07 ± 2.21	72.91 ± 3.06