Hostname: page-component-8448b6f56d-c47g7 Total loading time: 0 Render date: 2024-04-16T14:58:50.939Z Has data issue: false hasContentIssue false

Registry of Adolescent and Young Adult Twins in the Tokyo Area

Published online by Cambridge University Press:  21 February 2012

Chizuru Shikishima*
Department of Human Sciences, Faculty of Letters, Keio University, Japan.
Juko Ando
Department of Human Sciences, Faculty of Letters, Keio University, Japan.
Yutaka Ono
Health Center, Keio University, Japan.
Tatsushi Toda
Department of Medical Genetics, Osaka University Graduate School of Medicine, Japan.
Kimio Yoshimura
Department of Health Policy and Management, School of Medicine, Keio University, Japan.
*Address for correspondence: Chizuru Shikishima, 1–40–30 Naritahigashi, Suginami-ku, Tokyo 166–0015, Japan.


Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Since established in 1998, the Keio Twin Project (KTP) has been dedicated to investigating genetic and environmental sources contributing to human psychological traits in adolescence and young adulthood. A population-based twin registry was constructed by the KTP through the use of official residential records in the Tokyo area, and to date requests to participate in our research have generated 1040 pairs of twins and triplets of age 14 to 30, forming one of the largest twin registries in Asia. Our comprehensive datasets, obtained through questionnaires, performance tests, and physical measurements, cover a wide range of human traits: personality, psychiatry, mental health, sociality, cognition, and physical index. Demographic variables and environment of upbringing are also sought by twins and by some parents. This extensive information allows us to clarify the genetic and environmental overlap across multiple traits as well as specificities unique to single traits. Adding an evolutionary psychology perspective to the behavior genetics framework is currently being attempted in order to develop a grand theory of human genetics.

Copyright © Cambridge University Press 2006