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Article
May 1963

Personality Development in Identical Twins

Author Affiliations

DETROIT; EDINBURGH, SCOTLAND
From the Department of Psychiatry of Wayne State University College of Medicine and Lafayette Clinic, Detroit.
Associate Professor of Psychiatry, Wayne State University, and Lafayette Clinic (Dr. Lowinger) ; Assistant Professor of Psychiatry, Wayne State University and Lafayette Clinic (Dr. Schorer) ; Unit for Research on the Epidemiology of Psychiatric Illness, Honorary Lecturer Department of Psychological Medicine, University of Edinburgh, Scotland (Dr. Knox).; From the Department of Psychiatry of Wayne State University College of Medicine and Lafayette Clinic, Detroit.

Arch Gen Psychiatry. 1963;8(5):509-517. doi:10.1001/archpsyc.1963.01720110085010
Abstract

There has been a resurgence of interest in the role of heredity in mental illness. Current psychiatric twin research has emphasized the statistical comparison of large groups of uniovular and biovular twins with respect to concordant and discordant characteristics. Kallmann's book1 gives the history and philosophy of genetics in psychiatry as well as a summary of his work in this field.

Slater's publications2,3 on twins presents his research as well as tracing psychiatric twin studies from Francis Galton to the present. Psychological investigations of intelligence and personality by earlier workers were summarized by Woodworth4 in 1941, although several papers5-13 have appeared more recently. A comprehensive review of behavior genetics by Fuller and Thompson14 appeared in 1960.

Several psychodynamic views15-17 of the personality development of twins have been published. They emphasize a study of heredity versus environment and the

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