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The twinship paradigm describes a pattern of dyadic, quasi-object relationship, the purpose of which is to facilitate differentiation, separation, and integration. Twinships can arise at any point in the life cycle, when the self faces a developmental impasse. The twin functions as an alter-ego. Twin selection is based on two principles, namely, sympathetic resonance of experience, and difference. The two essentials of the resonance are similarity of developmental task, and similarity of obstacles to its accomplishment. The essentials of the difference lie in the fact that the twin is seen either as an idealized alter-ego, or as the carrier of the self's intolerable aspects. Twinships can collapse, in the presence of massive investment in the archaic symbiotic bond. They then lose their transitional status, and can degenerate into a fixation on a separation-impeding dyadic mode of relating.  相似文献   
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Although it is well known that adolescent delinquent behavior is related to poor outcomes in adulthood, longitudinal research on specific acts of delinquency and their interplay with important individual characteristics in predicting future outcomes is scarce. We aimed to examine how physical fighting—one of the most common acts of violent delinquency among adolescent boys—is related to adult life success in several domains, and how intelligence influences these associations. The study used data from 1,083 boys that participated in the population-based longitudinal Young in Norway Study, following adolescents from 1992 to 2015, by combining self-reports at four time points with comprehensive information from registers. Results showed that adolescent boys’ physical fighting was associated with poor adult outcomes in the domains of employment, education, and criminal behavior. Associations remained significant even after controlling for conduct problems in general—which isolated the effects of fighting from other delinquent acts—as well as from a variety of other potential confounders. Detailed analyses on the interplay of physical fighting and intelligence showed that some parts of the associations between adolescent boys’ fighting and several adverse adult outcomes could be ascribed to lower intelligence among the fighters. Moreover, intelligence moderated the relationship between physical fighting and adult education. Adolescent fighting was not related to educational attainment among boys with high intelligence, whereas boys with lower intelligence experienced detrimental effects of adolescent fighting. The analyses show the importance of considering adolescent boys’ physical fighting as a potential risk factor for future social marginalization.  相似文献   
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