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This book is based on a study of sixty-five pairs of twins who showed criminal behavior. Of fifteen pairs of identical male twins, there was similarity of criminal behavior in nine pairs and dissimilarity in six pairs. Of seventeen pairs of fraternal male twins, seven exhibited concordance and ten discordance of criminal behavior; of three pairs of identical female twins there was concordance in two pairs and discordance in one pair, and of two pairs of fraternal female twins, there was dissimilarity of criminal behavior in both pairs. Résumés of the records of all the pairs of the same sex comprise roughly two fifths of the book. All the identical twins are reported to have been similar in every-day social adjustment, character structure and the configuration of psychopathic tendencies, while the fraternal twins were always different in these respects.
The author concludes that some criminality is of hereditary origin and
Die Ursprünge des Verbrechens. Dargestellt am Lebenslauf von Zwillingen. Arch NeurPsych. 1937;37(2):478. doi:https://doi.org/10.1001/archneurpsyc.1937.02260140264020
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