To evaluate how the changes in functional connectivity of the NAcc in ADHD relate to impulsivity, we combined the comparison map generated in section 1 to the correlation map generated in section 2, identifying only the connections that overlapped and were present in both independent analyses. This procedure enabled us to identify connections associated with ADHD (from the comparison map – section 1) that were also correlated with delay discounting gradient. We found that atypical functional connectivity between the left anterior PFC (aPFC/ Talairach: −22 +54 +08 and −28 +47 +15) and the NAcc in ADHD was associated with ln(k). More specifically, stronger correlation between NAcc and left aPFC was associated with greater ln(k) (i.e. greater impulsivity). It was also found that atypical NAcc connectivity to the vmPFC was correlated to ln(k) (Talairach: −10 +41 −13), but, because the overlap region was very small, it was not displayed in the figure. Figure 3 displays the main results. See Table 2 for all the coordinates.
