Attention deficit/hyperactivity disorder, or ADHD, is one of the most frequently diagnosed neurobehavioral problems in children and is thought to be largely hereditary. But only a small number of cases have been linked to specific genes, leading many researchers to explore the impact of environmental exposures. In this podcast, Susan Schantz discusses how the neurologic effects of lead and polychlorinated biphenyls compare with symptoms of ADHD and what environmental health researchers can learn from those similarities and differences. Schantz is a professor of veterinary biosciences at the University of Illinois at Urbana–Champaign. Visit the podcast webpage to download a full transcript of this podcast.