Abstract
Differences in heritability and shared environmentality across levels of cognitive ability were assessed in a sample of 264 twin pairs tested at 1 year of age and in subsets tested at 2 and 3 years. Using an extension of the DF multiple regression methodology for analyzing twin data, no evidence was found for a linear or quadratic effect of level of cognitive ability on estimates of heritability or shared environmentality.
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This research was supported in part by Grants HD-18426 and HD-19802 from the National Institute of Child Health and Human Development (NICHD) and by a grant from the John D. and Catherine T. MacArthur Foundation. Analyses of the data were facilitated by BRSG Grant RR-07013-25 awarded to the University of Colorado by the Biomedical Research Support Grant Program, Division of Research Resources, National Institutes of Health. L.R.C. is supported by Training Grant HD-07289 from NICHD and S.S.C. is supported in part by the Natural Sciences and Engineering Research Council of Canada.
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Cherny, S.S., Cardon, L.R., Fulker, D.W. et al. Differential heritability across levels of cognitive ability. Behav Genet 22, 153–162 (1992). https://doi.org/10.1007/BF01066994
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DOI: https://doi.org/10.1007/BF01066994