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

Table 5

Signal-to-artifact ratio for contaminated EEG, corrected EEG, and gain (mean of all EEG channels and mean of all simulated subjects).

Low-pass EOG filter (Hz)	SAR before artifact removal	Simple		Adaptive filtering				Hybrid methods
		Regression; (mean ± SD)		LMS; (mean ± SD)		RLS; (mean ± SD)		REGICA; (mean ± SD)		AIR; (mean ± SD)
		After	Gain	After	Gain	After	Gain	After	Gain	After	Gain
4	78.54	112.7	1.44	116.3	1.49	120.7	1.54	123.2	1.57	124.0	1.58
5		114.5	1.46	118.3	1.51	123.9	1.58	127.3	1.63	128.3	1.64
6		115.4	1.47	119.2	1.52	125.7	1.60	129.8	1.66	130.8	1.67
7		115.7	1.47	119.2	1.52	126.2	1.61	130.7	1.67	131.8	1.68
8		115.6	1.47	118.9	1.52	125.9	1.61	130.7	1.67	131.7	1.68
9		115.4	1.47	118.5	1.51	125.4	1.60	130.2	1.66	131.2	1.68
10		115.2	1.47	118.2	1.51	124.9	1.60	129.7	1.66	130.7	1.67
12		114.9	1.46	117.7	1.50	124.2	1.59	128.9	1.65	129.9	1.66
15		114.7	1.46	117.5	1.50	123.7	1.58	128.4	1.64	129.3	1.65
20		114.5	1.46	117.3	1.50	123.4	1.58	128.0	1.63	128.9	1.65
25		114.5	1.46	117.2	1.50	123.3	1.57	127.8	1.63	128.7	1.64
35		114.4	1.46	117.1	1.50	123.1	1.57	127.7	1.63	128.6	1.64
Unfiltered		114.2	1.46	116.9	1.49	122.8	1.57	127.2	1.62	128.1	1.64