An Efficient Frequency Recognition Method Based on Likelihood Ratio Test for SSVEP-Based BCI

Table 2

The information transfer rate (bits/min) for 11 subjects by the three methods with seven different time windows. The better results for each subject are displayed in bold at each time window length.

Time	Method	Subjects											Average
		S1	S2	S3	S4	S5	S6	S7	S8	S9	S10	S11
0.5 s	LRT	20.1	37.9	3.5	41.5	65.1	82.4	17.2	3.3	31.3	10.9	64.1	34.3
	CCA	6.6	37.3	2.7	30.1	60.5	83.5	11.7	1.7	30.7	10.2	56.0	30.1
	LASSO	7.2	9.2	1.7	31.3	24.2	34.5	4.2	0.9	13.2	3.1	6.0	12.3
0.75 s	LRT	25.3	53.0	6.9	51.7	70.4	88.0	21.0	6.5	41.0	22.3	75.2	41.9
	CCA	24.5	49.5	2.9	49.5	63.2	80.2	21.0	3.7	34.3	19.6	70.4	38.1
	LASSO	16.4	21.0	4.4	47.2	50.6	46.1	7.3	0.4	19.6	7.3	12.5	21.2
1 s	LRT	27.7	56.4	8.8	51.8	65.4	74.0	30.7	9.4	47.4	28.6	69.5	42.7
	CCA	24.8	59.9	5.0	47.4	56.4	71.7	21.2	6.8	50.3	28.6	67.3	40.0
	LASSO	19.7	30.7	5.0	50.3	51.8	53.4	7.3	3.5	20.4	13.1	13.1	24.4
1.25 s	LRT	35.9	53.7	11.6	49.9	65.3	68.6	33.2	8.9	48.0	21.9	62.4	41.8
	CCA	33.2	49.9	6.0	48.0	57.7	65.3	29.5	7.1	49.9	22.8	65.3	39.5
	LASSO	27.2	35.9	4.1	48.0	53.7	49.9	10.9	2.2	27.2	13.8	8.9	25.6
1.50 s	LRT	39.5	51.4	12.7	47.0	60.0	60.0	31.6	11.1	49.0	25.0	56.6	40.4
	CCA	34.6	51.4	8.2	44.9	53.8	60.0	26.2	8.8	47.0	23.8	56.6	37.7
	LASSO	20.4	30.3	9.6	49.0	51.4	49.0	9.6	4.1	23.8	15.3	11.1	24.9
1.75 s	LRT	34.4	49.7	10.7	47.1	49.7	53.3	31.1	9.1	47.1	36.2	53.3	38.3
	CCA	34.4	49.7	7.5	44.5	47.1	53.3	34.4	11.6	44.5	34.4	53.3	37.7
	LASSO	21.1	32.7	9.1	53.3	49.7	47.1	9.1	6.2	25.1	18.8	8.3	25.5
2 s	LRT	32.9	48.0	12.3	36.9	44.4	48.0	27.7	10.4	44.4	27.7	48.0	34.6
	CCA	31.1	44.4	9.5	36.9	44.4	48.0	29.4	12.3	44.4	29.4	48.0	34.3
	LASSO	26.0	31.1	12.3	44.4	44.4	44.4	15.4	5.6	24.6	20.3	17.8	26.0