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

Table 1

Haemodynamic parameters, thickness, and optical properties for each layer of an adult head model.

Tissue type	Baseline concentration		Absorption coefficient 𝜇𝑎	Transport scattering coefficient 𝜇^′𝑠	Thickness
	HbO2 (μM)	HHb (μM)	750/830 nm (mm^−1)	750/830 nm (mm^−1)	(mm)
Scalp	64	27	0.0177/0.0203	2.11/1.84	3
Skull	57	24	0.0158/0.0181	1.79/1.47	7
CSF	14	6	0.0039/0.0045	0.27/0.22	2
Gray matter	128	55	0.0358/0.0409	2.39/2.10	4
White matter	50	21	0.0138/0.0158	9.62/8.82	30