Twins: The finest natural experiment |
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| Authors: | Nancy L. Segal |
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| Affiliation: | 1. Faculty of Psychology and Sports Science, Bielefeld University, Universitätsstrasse 25, 33615 Bielefeld, Germany;2. Cognitive Interaction Technology, Center of Excellence, Bielefeld University, Universitätsstrasse 25, 33615 Bielefeld, Germany;3. CoR-Lab, Research Institute for Cognition and Robotics, Bielefeld University, Universitätsstrasse 25, 33615 Bielefeld, Germany;1. Department of Cardiology, The First Hospital of China Medical University, 155 Nanjing North Street, Heping District, Shenyang 110001, China;2. Department of Hematology, The First Hospital of China Medical University, 155 Nanjing North Street, Heping District, Shenyang 110001, China;3. Department of Cardiovascular Medicine, Beijing Moslem Hospital, Beijing 100054, China |
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| Abstract: | Twin studies have moved beyond the classic design described by Galton (1875). Natural experiments involving twins and twin-like individuals occur constantly, driven largely by artificial reproductive technology and increased adoption rates. These events have produced exotic twin and sibling relations, e.g., virtual twins (same-age unrelated siblings) and twins reared apart (Chinese twin girls, abandoned and adopted separately). Research designs utilizing the unique genetic and social relatedness of such individuals can inform numerous behavioral domains. Many studies to be described were inspired by my association with the Minnesota Study of Twins Reared Apart (1982–1991), directed by Bouchard. |
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