First published in 1987. This volume presents a collection of chapters on varied aspects of psychotic symptoms, largely within the context of positive versus negative symptoms. These chapters cover a broad range of aspects of these symptoms, such as longitudinal course, cognitive correlates, biochemical and structural correlates, conceptual issues, and research methods. The majority of these chapters were presented at the SUNY-Binghamton/Cornell University conference on schizophrenia that took place on October 17-19, 1985, in Ithaca, NY. That conference was designed to provide a forum for the dissemination of information on psychotic symptoms in general, with the overriding framework of positive versus negative symptoms.