A series of studies in schizophrenia, using several varieties of the twin study method, are reviewed and five major conclusions or hypotheses drawn. A modified twin study design—the co-twin comparison method—is described, with which these conclusions and hypotheses can be tested; and two additional major issues—specificity to schizophrenia, and the antecedent-consequent question—dealt with. A stress model of schizophrenia pathogenesis is presented, which attempts to integrate genetic, biochemical, and experiential variables.
Pollin W. The Pathogenesis of Schizophrenia: Possible Relationships Between Genetic, Biochemical, and Experiential Factors. Arch Gen Psychiatry. 1972;27(1):29–37. doi:10.1001/archpsyc.1972.01750250021002
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