Editing Flynn effect (section)

===Heterosis===
{{Further|Inbreeding depression#In humans}}
[[Heterosis]], or ''hybrid vigor'', associated with historical reductions of the levels of [[inbreeding]], has been proposed by Michael Mingroni as an alternative explanation of the Flynn effect.<ref>Mingroni, M. A. (2007). "[http://www.iapsych.com/iqmr/fe/LinkedDocuments/mingroni2007.pdf Resolving the IQ paradox: Heterosis as a cause of the Flynn effect and other trends]" (PDF). ''Psychological Review'', 114(3), 806–829. doi:10.1037/0033-295X.114.3.806</ref><ref>Mingroni, M.A. (2004). "[https://www.mingroni.net/_files/ugd/970723_2f1c2ed3946246e0b69a9c1b1396c825.pdf The secular rise in IQ: Giving heterosis a second look]" (PDF). ''Intelligence'', 32, 65-83.</ref> However, James Flynn has pointed out that even if everyone mated with a sibling in 1900, subsequent increases in heterosis would not be a sufficient explanation of the observed IQ gains.<ref>[[Nicholas Mackintosh|Mackintosh, N.J.]] (2011). ''IQ and Human Intelligence''. Oxford: Oxford University Press, p. 291.</ref>