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Characteristics of the Twins of Schizophrenics as Fallible Indicators of Schizoidia

Published online by Cambridge University Press:  01 August 2014

I. I. Gottesman ,
J. Shields  and
L. L. Heston
I. I. Gottesman*
Affiliation:
Department of Psychology, University of Minnesota, Minneapolis, Minnesota, USA
J. Shields
Affiliation:
Institute of Psychiatry, Maudsley Hospital, London, UK
L. L. Heston
Affiliation:
Department of Psychiatry, University of Minnesota, Minneapolis, Minnesota, USA
*
Department of Psychology, Elliott Hall, University of Minnesota, Minneapolis, Minnesota 55455, USA

Abstract

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Further advances in research into the etiology of schizophrenia will depend on the identification of an unambigous indicator of the genotype associated with the development of schizophrenia. Such an indicator would permit accurate assessment of the relatives of probands as “affected” or not, so that the data generated in twin and family studies could be tested for the best fit to various genetic models that have been proposed. Schizoidia or schizoid personality has been considered by clinicians to be such an indicator, but it has been beset by semantic and logical difficulties. Most troublesome has been the extent to which the concept implies (merely) a phenotypic resemblance to schizophrenia, or a genotypie connection with it, or both. Four different but overlapping meanings for the concept of schizoidia are presented, in an effort to clarify the semantic and logic involved. Following Popper's notions about the testability and refutability of theories, the authors, identified with both monogenic and polygenic theories, apply the definitions to their first-hand observations of the cotwins in the Maudsley-Bethlem Schizophrenic Twin Study. Pushing the concept to its limit, 91 % of 22 MZ pairs and 45% of 33 DZ pairs contained “disordered” cotwins.

Type
6. Twin Studies in Behavior Genetics
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 25 , Issue 1 , January 1976 , pp. 225 - 236
Copyright
Copyright © The International Society for Twin Studies 1976

References

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