The Diagnostic and Statistical Manual of Mental Disorders contains the official diagnostic criteria for recognized mental illnesses. Some have asserted that DSM revisions have caused the boundaries of specific disorders to expand to include more behaviors, but no previous research has examined if such expansion is isolated or endemic. The current research consisted of an exploration of revisions to diagnostic criteria for 81 disorders. Each change between editions of the DSM was conceptually analyzed as making the disorder more exclusive or (...) more inclusive in terms of the number of people who could theoretically meet the criteria. Results indicated that 63% of disorders moved toward inclusivity, that each edition of the DSM moved toward inclusivity, and that most types of revisions increase inclusivity. (shrink)

The stated purpose of the Diagnostic and Statistical Manual of Mental Disorders is to classify mental disorders. However, no tenable operational definition of mental disorder is offered in the manual. This leaves the possibility open that the behaviors labeled as disordered in the DSM are not members of a valid category. Attempts to define mental illness fall into the category of essentialist or relativist based, respectively, on the acceptance or denial of the existence of a defining biological attribute that all (...) mental disorders possess. However, the disorders in the DSM cannot be accounted for by either of these approaches making it unlikely that they represent a single valid concept. Simultaneous inclusion of brain illnesses and normal behaviors in the DSM are a likely explanation for the disparate nature of DSM disorders. (shrink)