Bleuler’s approach was also notable for other reasons. First, his reformulation of dementia praecox as “the group of schizophrenias” foreshadowed the modern view that schizophrenia is a heterogeneous group of disorders with similar clinical presentations. Second, Bleuler included defects in affect as a core feature of the disorder. Third, his view of schizophrenia allowed for the possibility

of remission or recovery. Kraepelin’s and Bleuler’s observations provided the foundation for contemporary systems Inhibitors,research,lifescience,medical of psychiatric classification, including the International Classification of Disease and Death (ICD) and the American Psychiatric Association’s DSM. These systems have thus benefited from incisive clinical observations of, and conceptualizations about, schizophrenic illness. They also, however, inherited the limitations of Kraepelin and Bleuler’s efforts at classification and diagnosis. The first DSM definition of schizophrenia was vague, unreliable,

and allowed for too much discretion on the part of clinicians. As a result, apparent geographical differences Inhibitors,research,lifescience,medical arose in the rates of schizophrenia. In the United States, schizophrenia became the diagnosis of choice for psychotic conditions that lacked a clear “organic” etiology, and thus appeared to occur more frequently than it did in the United Kingdom.3 DSM-II continued’the DSM-I Inhibitors,research,lifescience,medical tradition of unreliable diagnoses, although it did incorporate the issue of differential diagnoses. Inhibitors,research,lifescience,medical Both of these early systems viewed psychosis as a key feature of the disorder (we use the term psychosis to encompass hallucinations, delusions, and gross disorganization of thought or behavior). Interestingly, however, and despite its emphasis on psychosis, DSM-II did contain a nonpsychotic subtype of schizophrenia, called latent schizophrenia, which Inhibitors,research,lifescience,medical included a heterogeneous group of FK228 cell line patients who in DSM-I were diagnosed with “incipient” or “borderline” schizophrenia, among other conditions. As the term “latent” implies, however, the category was intended to encompass individuals with underlying or occult psychotic conditions, instead

of identifying individuals who had schizophrenia in the absence of psychosis. Nevertheless, the category did represent an important crotamiton attempt to delineate the role of psychosis in schizophrenia. DSM-III resulted largely from the efforts of the “neo Kraepelinian” movement of the 1960s and 1970s,4 and from the efforts of other investigators in psychiatry and clinical psychology who argued for empirical, psychometric validation of psychiatric syndromes (eg, reference 5). DSM-III represented a marked shift from previous DSM.s, and contained a number of innovations, like field tests of diagnostic reliability, specific inclusion and exclusion criteria for diagnoses, multiaxial diagnosis, and a focus on the description of syndromes and course of disorders rather than inferences about their etiology.