A study has found a potential link between a gene that facilitates communication between brain regions and attention deficit hyperactivity disorder (ADHD). The discovery is part of a broader effort to understand the genetic underpinnings of mental health, with research also exploring connections between various conditions, including autism, Alzheimer's, and schizophrenia. The findings may have implications for how these conditions are understood and treated, although the specifics of the connections between them are still being uncovered.