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How Can We Boost IQs of "Dull Children"?: A Late Adoption Study
Michel Duyme, Annick-Camille Dumaret and Stanislaw Tomkiewicz
Proceedings of the National Academy of Sciences of the United States of America
Vol. 96, No. 15 (Jul. 20, 1999), pp. 8790-8794
Published by: National Academy of Sciences
Stable URL: http://www.jstor.org/stable/48565
Page Count: 5
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
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From 5,003 files of adopted children, 65 deprived children, defined as abused and/or neglected during infancy, were strictly selected with particular reference to two criteria: (i) They were adopted between 4 and 6 years of age, and (ii) they had an IQ <86 (mean = 77, SD = 6.3) before adoption. The average IQs of adopted children in lower and higher socioeconomic status (SES) families were 85 (SD = 17) and 98 (SD = 14.6), respectively, at adolescence (mean age = 13.5 years). The results show (i) a significant gain in IQ dependent on the SES of the adoptive families (mean = 7.7 and mean = 19.5 IQ points in low and high SES, respectively), (ii) IQs after adoption are significantly correlated with IQs before adoption, and (iii) during adolescence, verbal IQs are significantly lower than performance IQs.
Proceedings of the National Academy of Sciences of the United States of America © 1999 National Academy of Sciences