Defining neuropsychiatry: professional activities and opinions of psychiatrist-neurologists with dual certification.

A computer-based search was conducted to locate physicians jointly certified by the American Board of Psychiatry and Neurology in both adult psychiatry and adult neurology since 1960. Eighty-six such physicians were found, and a survey concerning their practice patterns and opinions was conducted. From this survey, it appears that a number of "supraspecialized" neuropsychiatrists are involved in clinical activities that overlap the traditional limits of neurology and psychiatry.