Procedure
ADHD
Boys with ADHD were scanned in a double-blind, placebo-controlled, cross-over design. On each scanning session (1 week apart), they received a single dose of either placebo (vitamin C, 50mg), methylphenidate (Equasym, 0.3mg/kg, 5–20mg), or atomoxetine (Strattera, 1mg/kg, 16–66mg) in a pseudo-randomised order. Dosages were determined following National Institute for Health and Care Excellence guidelines at the time of the study (National Institute for Health and Care Excellence Controls were scanned once, unmedicated.