For many people, the stereotypical image of attention deficit hyperactivity disorder is an 8-year-old boy who can’t sit still in class. But in recent decades, scientists have gained a more sophisticated understanding of the causes and lifelong consequences of the disorder. Margaret Sibley, PhD, of Seattle Children’s Hospital, talks about the biological underpinnings of ADHD, what researchers have learned about how it manifests in childhood, adolescence and adulthood, treatment options, and why the pandemic may have caused an uptick in ADHD diagnoses.