Abstract

The verbal concept formation Test is used as one of the logical, abstract and generalizing mental function test, because of least deteriorations are carried or scarcely any deterioration by the maladjustment or mental disorder. Similarity subtest of the KWIS is also available as the part of the verbal concept formation test, inquiring into the similarity or commonness of the two things is also a search for the conceptual abstraction or generalization under which two objects or ideas can be subsumed. The results of the study with Similarity subtest of the KWIS suggest that the schizophrenic patients show some deteriorations in the verbal concept formation ability as well as other mental ability in quantitative view point, and qualitatively, they also show the schizophrenic queerness and schizophrenic logics.