Fig. 1From: The neural correlates of mental arithmetic in adolescents: a longitudinal fNIRS studya Positions of the fNIRS channels mapped on the brain (by Minako Uga). As an example, the right brain hemisphere is shown along with the red marked positions for the orientation of the probeset (the same applies to the left hemisphere). Channels included in the parietal, frontal, and parieto-temporal ROIs are marked by the orange boxes. b Example trial for the arithmetic task. The adolescents had to produce the correct solution and write it on the screen. c Exemplary course of the fNIRS signal. The block average curves of O2Hb (red), HHb (blue) and signal corrected by CBSI (orange) are given for the left parietal ROI for simple subtraction in grade 7Back to article page