Hi, thank you for your question. The Healthy Brain Network utilizes a community-referred recruitment model based on perceived clinical concerns. For this reason, it includes a high proportion of individuals affected by mental health or learning disorders. However, the HBN dataset also includes participants with no diagnoses. You can find more information about the initiative at https://fcon_1000.projects.nitrc.org/ind... and about the diagnoses and diagnostic process at https://fcon_1000.projects.nitrc.org/ind...