A New Approach to Separate Haemodynamic Signals for Brain-Computer Interface Using Independent Component Analysis and Least Squares

Table 2

Simulation parameters for amplitude and frequency of interference oscillations and haemodynamic changes.

Head layers	Blood contents	α (μM) respiration	β (μM) cardiac	γ (μM) low-frequency oscillation	ζ (μM) very-low-frequency oscillation	ι (μM) evoked response
Scalp	HbO2	0.2	0.6	0.9	1.0	0
	HHb	0.013	0.04	0.058	0.06	0
Skull	HbO2	0.2	0.63	0.96	1.1	0
	HHb	0.012	0.045	0.06	0.07	0
CSF	HbO2	0.02	0.06	0.08	0.11	0
	HHb	0.001	0.004	0.005	0.007	0
Gray matter	HbO2	0.2	0.65	0.92	1.1	15
	HHb	0.014	0.043	0.07	0.072	−4
White matter	HbO2	0.2	0.6	0.9	0.9	0
	HHb	0.012	0.04	0.06	0.06	0