In contrast to the cortical results, where a linear reduction in strength of the relationship with age was seen, the relationship between ADC/FA and cognition was strongest around 6–10 and above 16 y, with correlations not significant in the middle part of the age range (Fig. 3)

The relationship between right anterior cingulate surface area and incongruent RT was plotted as a continuous function of age. The relationship was strongest for the youngest part of the sample, and it decreased linearly in strength with age