title: Abstraction and schizophrenia: problems in psychological deficit research.
mesh_terms: D003072:Cognition Disorders / Q000523:psychology; D003210:Concept Formation; D006801:Humans; D008137:Longitudinal Studies; D011581:Psychological Tests; D011582:Psychological Theory; D012107:Research Design; D012559:Schizophrenia / Q000145:classification; D012565:Schizophrenic Psychology; D014888:Wechsler Scales