Introduction: research at the interface of medicine and psychiatry.

Linkages between psychiatry and other medical specialties have become increasingly evident over the past decade. Reinstatement of the medical internship for psychiatric trainees, expansion of psychiatric liaison services, growth of general hospital psychiatric units, determination of the extensive role served by nonpsychiatric physicians in providing mental health care, and research evidence of the economic benefits of incorporating mental health services in general health settings all have served to break down artificial boundaries between mental health and general health concerns. The psychiatric consultation-liaison service initiated in 1981 by the NIMH at the NIH Clinical Center in Bethesda has afforded opportunity for numerous collaborative research projects with clinical investigators of various categorical disease programs. In addition to offering new etiological insights into psychiatric and general medical illnesses, the work described in this symposium promises to move clinical practice closer toward the Engel model of biopsychosocial medicine.