https://www.podbean.com/media/share/pb-55uae-e6587f
Textbooks make claims like:
“The ultimate check of the strength of inhered factors would seem to be to compare identical twins who have been separated and brought up in different family environments. Bouchard et al located over 100 such twin pair adults who had been separated infancy and measured them on standard IQ tests. They found that the correlation between twin pairs was 0.76. While this is somewhat lower than that found for monozygotic twins reared together (r=.85), it was nevertheless higher than found for dizygotic twins reared together (r=.55). This provided strong evidence that heredity contributes substantially to IQ and that the more similar environments normally experienced by monozygotic twins cannot account for the higher correlation between identical twins than between fraternal twins.”
Should you believe this? I examine
Bouchard, Lykken, McGue, Segal, & Tellegen (1990). Sources of human psychological differences: The Minnesota Study of Twins Reared Apart. Science, 250(4978), 223–228
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