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Cyril BurtFraud or Framed?$
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N. J. Mackintosh

Print publication date: 1995

Print ISBN-13: 9780198523369

Published to Oxford Scholarship Online: March 2012

DOI: 10.1093/acprof:oso/9780198523369.001.0001

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Twins and other kinship studies

Twins and other kinship studies

(p.45) Three Twins and other kinship studies
Cyril Burt

N. J. Mackintosh

Oxford University Press

Burt's paper ‘The genetic determination of differences in intelligence: a study of monozygotic twins reared together and apart’, published in 1966, provided the most systematic account of his data on kinship correlations for IQ, including what was at the time much the largest sample of separated identical (MZ) twins ever reported. The 1966 paper was the first whose central purpose was to present these data in their entirety with new, larger samples, to provide information about how they had been collected and analysed, and in effect to summarize his life's work on this issue. A reading of the paper makes it rather clear that it was written, at least in part, as a rebuttal of the arguments of various armchair critics who claimed, according to Burt in the absence of any evidence, that environmental factors were largely responsible for individual differences in IQ. His twin data have provided Burt's later critics with the basis for some of their most dramatic, and widely publicized, accusations of fraud.

Keywords:   kinship correlations, IQ, invariant correlations, Cyril Burt, physical measurements, monozygotic twins

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