Fig. 3From: The neural correlates of mental arithmetic in adolescents: a longitudinal fNIRS studyCortical activation in the frontal and parietal ROIs. a Significant reduction in frontal activation from grade 6 to grade 7 in the subtraction task (*p < .05). b Significantly increased parietal activation for simple compared to complex blocks in the multiplication task (*p < .05). Error bars indicate 1 SE of MBack to article page