Fig. 8.

Reference maps for ROIs in the frontal, temporal, and parietal cortex for placement of fNIRS channels in infants of 4 to 5.5 months (a) and 5.5 to 7 months (b). The regions highlighted were identified during the atlas projections in 75% to 100% of the 55 infants tested. The distances given are relative to a referential axial curve between the glabella and the point at which the top of the ear joins the head. Note that for the superior temporal sulcus and temporoparietal locators these are defined as regions as the identity across the group was split between the superior temporal-middle temporal gyri and superior temporal-postcentral gyri respectively (the atlases do not define sulci). The positions with a purple marker are closest/overlapping with the temporoparietal junction (median distance of channel from TPJ is $<2\mathrm{mm}$). The white markers indicate the position of the nasion, inion, and preauricular points and the red dashed lines and markers identify the position of the fNIRS headband on the infant head.