Topics course. A seminar on the role of possessions in people's lives, especially as related to compulsive hoarding, a form of obsessive compulsive disorder and related disorders. We study the empirical research, theories of OCD and hoarding behavior, and efforts to develop treatments for this condition. Related constructs such as compulsive buying and acquisition, materialism, kleptomania and psychopathologies of acquisition are also addressed. Prerequisites; PSY 150 or PSY 287.