Show Summary Details

Page of

PRINTED FROM OXFORD HANDBOOKS ONLINE ( © Oxford University Press, 2018. All Rights Reserved. Under the terms of the licence agreement, an individual user may print out a PDF of a single chapter of a title in Oxford Handbooks Online for personal use (for details see Privacy Policy and Legal Notice).

date: 17 February 2020

Abstract and Keywords

This chapter provides an overview of the current evidence on the behavioral genetic etiology of mental retardation. It begins with a history of the two-group approach and the need to differentiate between organic and nonpathological forms of mental retardation. Then, it presents evidence that genetic and environmental factors that contribute to variation in IQ in the general population may also lead to low IQ in persons with familial mental retardation. The chapter continues with a review of the new behavioral genetic work to identify DNA markers for intelligence. It outlines methodological challenges, with particular emphasis on how these issues pertain to the search for an etiological link between familial mental retardation and normal variation in general cognitive ability. It concludes with a discussion of familial mental retardation within the broader scope of the reciprocal relation between genetic and environmental influences.

Keywords: Familial mental retardation, behavioral genetic etiology, IQ, DNA markers, intelligence, cognitive ability

Access to the complete content on Oxford Handbooks Online requires a subscription or purchase. Public users are able to search the site and view the abstracts and keywords for each book and chapter without a subscription.

Please subscribe or login to access full text content.

If you have purchased a print title that contains an access token, please see the token for information about how to register your code.

For questions on access or troubleshooting, please check our FAQs, and if you can''t find the answer there, please contact us.