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Similarities in Test Scores and Profiles of Kibbutz Twins and Singletons

Published online by Cambridge University Press:  01 August 2014

Michael Nathan  and
Ruth Guttman
Michael Nathan
Affiliation:
Department of Psychology, The Hebrew University of Jerusalem
Ruth Guttman*
Affiliation:
Department of Psychology, The Hebrew University of Jerusalem
*
Department of Psychology, The Hebrew University of Jerusalem, 91905 Jerusalem, Israel

Abstract

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Resemblances on five cognitive tests were compared in fifty quartets of school children. Each quartet consisted of a twin pair (MZ or DZ) and a matched singleton pair from the same kibbutz peer group. Similarities of MZs and DZs on test scores essentially replicate those reported previously in other studies. The median correlation for singleton control pairs is 0.29, as compared with that of 0.26 reported in the Texas Adoption Study for unrelated children raised in the same home. In the two spatial tests, control pairs were as similar as the DZ pairs. This suggests a more powerful influence on shared environment in aspects of perceptual performance. A new structural analysis (POSAC) of individual profiles of test scores is presented. Comparison of space diagrams of MZ, DZ, and singleton pair profiles shows systematic differences in structure among the three groups, in accordance with the predicted levels of genetic influences. Such structural differences transcend mere differences in size of correlation, and may give more stringent evidence for the respective roles of genetics and environment.

Keywords

IntelligenceSpecial environmentKibbutzWISC testsSpatial ability
Type
Twins and Mental Abilities
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 33 , Issue 2 , April 1984 , pp. 213 - 218
Copyright
Copyright © The International Society for Twin Studies 1984

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