Under the leadership of Dr. James F. Leckman, the research group has secured several federal and private grants to study the causes and treatment of Tourette syndrome (TS), obsessive-compulsive disorder (OCD), attention deficit-hyperactivity disorder (ADHD), and related childhood psychiatric disorders. In order to further our understanding of these disorders, we obtain a comprehensive set of data on all subjects, which allows a multidimensional analysis. Listed below are some of the primary studies underway as part of this effort.