Medicine And Books

Intelligence, Heredity, and Environment

BMJ 1998; 316 doi: https://doi.org/10.1136/bmj.316.7127.319a (Published 24 January 1998) Cite this as: BMJ 1998;316:319
  1. Stuart W G Derbyshire, research fellow
  1. University of Pittsburgh Medical Center, USA

    Ed Robert J Sternberg, Elena Grigorenko Cambridge University Press, £24.95, pp 608 ISBN 0 521 46904 X

    Few scientific discussions generate so much heat as those regarding intelligence. Argument rages as to whether there is a genetic influence over IQ and whether IQ is in turn related to intelligence. The similarity of IQ in twins reared apart certainly supports the view that genes have influence. Thomas Bouchard (chapter 5) reports five studies of identical twins who were reared apart and gives the weighted average correlation as 0.75, suggesting that a massive 75% of the variance in the twins' IQ can be related to their shared genes. Adoption studies suggest a more modest, but still hugely important, …

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