Hostname: page-component-cd9895bd7-jn8rn Total loading time: 0 Render date: 2024-12-26T11:47:38.800Z Has data issue: false hasContentIssue false
  • English
  • Français

Nature-Nurture and Intelligence: The Twin and Adoption Studies Agree

Published online by Cambridge University Press:  01 August 2014

Joseph M. Horn ,
John C. Loehlin  and
Lee Willerman
Joseph M. Horn*
Affiliation:
Department of Psychology, University of Texas, Austin, Texas, USA
John C. Loehlin
Affiliation:
Department of Psychology, University of Texas, Austin, Texas, USA
Lee Willerman
Affiliation:
Department of Psychology, University of Texas, Austin, Texas, USA
*
Psychology Department, University of Texas, Austin, Texas 78712, USA

Abstract

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.

A large-scale adoption study is underway at the University of Texas where IQ test scores are available for over 1200 women who gave up their children for adoption immediately following delivery. The adopted children and their adoptive families are now being located and tested and, if current trends continue, complete data should eventually be available on over 400 families. About half of these families will contain two or more adopted children or both adopted and natural children. At present, data are available for 89 families. The results are consistent with twin data and support a genetic hypothesis. The biological mother-adopted child correlation is 0.37 whereas the adoptive mother-adopted child and adoptive father-adopted child correlations are only 0.22 and 0.04 respectively. There are 59 pairs of unrelated children reared together in this sample and the IQ correlation for these children is only 0.13.

Type
6. Twin Studies in Human Genetics
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 25 , Issue 1 , January 1976 , pp. 195 - 197
Copyright
Copyright © The International Society for Twin Studies 1976