Table 2.

Center-of-mass activation displacements. The displacement in millimeters between the center-of-mass of the estimated localizer task responses for each modality is shown. The upper-right half of the table (italics) shows the minimum displacement between each modality along the depth from the scalp surface [e.g., also see Fig. 5(b)]. The bottom-left half (not italics) shows the center-of-mass displacement over the entire brain, including the subcortical regions. Distances cited in millimeters.

		fMRI-BOLD	MEG	$\mathrm{fNIRS}\text{-}{\mathrm{HbO}}_2$ (both sessions)	fNIRS-Hb (both sessions)	$\mathrm{fNIRS}\text{-}{\mathrm{HbO}}_2$ (MRI session)	fNIRS-Hb (MRI session)	$\mathrm{fNIRS}\text{-}{\mathrm{HbO}}_2$ (MEG session)	fNIRS-Hb (MEG session)
fMRI-BOLD		—	7.1	9.0	15.1	7.2	13.5	17.7	20.9
MEG		25.8	—	15.1	20.3	13.6	19.0	23.6	25.4
$\mathrm{fNIRS}\text{-}{\mathrm{HbO}}_2$	Both sessions	19.3	26.8	—	5.7	1.4	3.8	9.5	13.2
fNIRS-Hb	Both sessions	18.7	28.7	3.1	—	7.4	1.0	3.5	6.2
$\mathrm{fNIRS}\text{-}{\mathrm{HbO}}_2$	MRI session	20.8	21.4	9.9	12.8	—	5.2	10.9	14.5
fNIRS-Hb	MRI session	16.5	25.2	5.3	7.2	7.2	—	5.8	7.3
$\mathrm{fNIRS}\text{-}{\mathrm{HbO}}_2$	MEG session	29.3	51.6	30.7	27.8	39.2	32.0	—	2.3
fNIRS-Hb	MEG session	34.7	55.8	34.5	31.5	43.7	36.7	6.6	—