FIGURE 1. ADHD group subtraction image, on vs. off MPH. Superior and sagittal projections, over standard template, of statistical parametric (t) maps of distribution of differences between on-MPH and off-MPH conditions. Higher rCBF on MPH is seen in bilateral precentral gyri and ACC (Table 2) at t range of 3.4–6.0. P < 0.05, corrected for multiple comparisons. LT = left.