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Mirror Imaging in Twins: Biological Polarization – an Evolving Hypothesis

Published online by Cambridge University Press:  01 August 2014

A. Golbin ,
Y. Golbin ,
L. Keith  and
D. Keith
A. Golbin*
Affiliation:
Department of Psychiatry, University of Illinoisat Chicago, and the Department of Psychiatry, Cook County Hospital, Chicago, IL
Y. Golbin
Affiliation:
Department of Psychiatry, University of Illinoisat Chicago, and the Department of Psychiatry, Cook County Hospital, Chicago, IL
L. Keith
Affiliation:
Center for Study of Multiple Births, Chicago IL Department of Obstetrics and Gynecology, Northwestern University Medical Schooland the Prentice Women's Hospital and Maternity Center of Northwestern Memorial Hospital, Chicago, IL
D. Keith
Affiliation:
Center for Study of Multiple Births, Chicago IL
*
Department of Psychiatry, Cook County Hospital, Chicago, IL, USA

Abstract

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This study examined sleep patterns in twins, paying special attention to the mirroring phenomenon. Concordance and discordance of sleep related patterns (parasomnias) in a group of 27 monozygotic (MZ) mirror image twins were compared to sleep patterns in a group of 53 MZ non-mirror image twins and a group of 24 dizygotic (DZ) twin pairs. Sleep patterns had the lowest concordance among MZ mirror twins. “Mirroring” was observed not only in facial features but also in some physiological patterns such as sleep and sleep deviations. These facts suggest that mirroring in MZ twins is not merely a superficial epiphenomenon, but a reflection of a biological polarization. Biological polarization in this context is a descriptive term emphasizing the role of biological (physiological, biochemical or even genetic) versus psychological or environmental factors causing not only mirror body image but opposite tendencies in the development of personality, professional and sex orientation and, most importantly, the opposite presentation of pathology.

Keywords

TwinsMirror imagingSleepSleep disordersGenetic
Type
Research Article
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 42 , Issue 3-4 , October 1993 , pp. 237 - 243
Copyright
Copyright © The International Society for Twin Studies 1993

References

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