A critical analysis of IQ studies of adopted children

Richardson, K and Norgate, SH ORCID: https://orcid.org/0000-0003-0716-2558 2006, 'A critical analysis of IQ studies of adopted children' , Human Development, 49 (6) , pp. 319-335.

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Abstract

The pattern of parent-child correlations in adoption studies has long been interpreted to suggest substantial additive genetic variance underlying variance in IQ. The studies have frequently been criticized on methodological grounds, but those criticisms have not reflected recent perspectives in genetics and developmental theory. Here we apply those perspectives to recent IQ adoption studies and show how they further question two sets of problems: first, the assumption of additive gene and environmental effects; second, the assumption that the adoption situation approximates a randomized-effects design. We show how a number of possible factors having systematic effects in breach of those assumptions can produce the received pattern of correlations without appealing to unusual amounts of additive gene variance.

Item Type:	Article
Themes:	Subjects / Themes > H Social Sciences > HQ The family. Marriage. Woman > HQ503 The family. Marriage. Home > HQ0767 Children. Child development Subjects / Themes > R Medicine > R Medicine (General) Health and Wellbeing Subjects outside of the University Themes
Schools:	Schools > School of Health and Society > Centre for Applied Research in Health, Welfare and Policy Schools > School of Health and Society > Centre for Health Sciences Research
Journal or Publication Title:	Human Development
Publisher:	S. Karger AG, Basel
Refereed:	Yes
ISSN:	0018716X
Depositing User:	H Kenna
Date Deposited:	03 Aug 2007 10:35
Last Modified:	27 Aug 2021 19:48
URI:	http://usir.salford.ac.uk/id/eprint/94

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