Psychoses of the Schizophrenic Spectrum in Twins

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The book explores the complexities of schizophrenia research, emphasizing the impact of genetic and environmental factors on different types of psychoses. It presents a comprehensive overview of twin studies and a unique systematic study conducted by two psychiatrists, utilizing both DSM-III-R and ICD-10 diagnostic systems alongside Leonhard's subclassification. The findings challenge the notion of a continuum in schizophrenic disorders, revealing distinct etiological roles for genetic, somatic, and psychosocial factors across various psychosis groups, particularly highlighting the predominance of environmental influences in certain types.