11454. OBSESSIVE COMPULSIVE DISORDER: THE SEROTONIN CONNECTION. Following a brief overview of the epidemiology and phenomenology of Obsessive Compulsive Disorder (OCD), this paper investigates the etiology of OCD. Examines the evidence for the neurochemical basis of OCD and then considers other possible causal factions in OCD within an appropriate model of causation for psychological disorders. 9 pages, 31 footnotes, 11 bibliographic sources.