was first proposed by Emil Kraepelin (1856 - 1926) a German psychiatrist and Eugen Bleuler (1857 - 1939) who was a Swiss psychiatrist. They postulated the following types of Schizophrenia- simple, paranoid, catatonic and hebephrenia. Mixed Schizophrenia is described as having negative and positive symptoms where neither is more prominent.

MIXED SCHIZOPHRENIA: "Mixed schizophrenia is a condition marked by having mixed positive and negative symptoms which cancel each other out."