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Longitudinal Genetic Analysis of Childhood IQ in 6- and 7-year-old Russian Twins

Published online by Cambridge University Press:  21 February 2012

Sergey B. Malykh ,
Nadezhda M. Zyrianova  and
Lev S. Kuravsky
Sergey B. Malykh*
Affiliation:
Moscow City University of Psychology and Education, Moscow, Russia; Psychological Institute of Russian Academy of Education, Moscow, Russia. malykh@online.ru
Nadezhda M. Zyrianova
Affiliation:
Psychological Institute of Russian Academy of Education, Moscow, Russia.
Lev S. Kuravsky
Affiliation:
Moscow City University of Psychology and Education, Moscow, Russia.
*
*Address for correspondence: S. Malykh, Psychological Institute of Russian Academy of Education, 9 “B” Mokhovaya Street, 103009 Moscow.

Abstract

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Using a longitudinal twin study of Moscow children, we have studied the development of psychometric intelligence during the transition from preschool (age 6) to school (age 7). Children were tested using the Wechsler Intelligence Scale for Children (WISC). Simplex models were applied to explore the relationship of different sources of phenotypic variance. The following sources of variation were considered: genetic effects, common or shared family environment and unique environment. At age 6, genetic influences were much greater than those of shared environment but the magnitude of genetic influences decreased and the magnitude of shared environment influences increased substantially by age 7.

Type
Articles
Information
Twin Research and Human Genetics , Volume 6 , Issue 4 , 01 August 2003 , pp. 285 - 291
Copyright
Copyright © Cambridge University Press 2003