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An update on ADHD neuroimaging research

Since the publication of a critical review on ADHD neuroimaging in a past issue of this journal (Leo and Cohen, 2003), several relevant studies have appeared, including one study that had a subgroup of unmedicated ADHD children (Sowell, Thompson, Welcome, Henkenius, Toga, and Peterson, 2003). In this update to our earlier review we comment on this last study's failure to report on the crucial comparison between unmedicated and medicated ADHD subjects. The issue of prior medication exposure in ADHD subjects constitutes a serious confound in this body of research, and still continues to be dismissed and willfully obscured by researchers in this field.