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Judge et al. (2009), did find a small (''r'' = 0.16) correlation between looks and general intelligence,<ref>https://psycnet.apa.org/record/2009-06703-013</ref> however this may have been caused by his sample being middle aged. Intelligence is linked with greater health, and part of this may be attributable to lifestyle factors.<ref>https://www.statnews.com/2017/06/28/high-iq-children-longevity-study/</ref> Thus, the link between IQ and health may only become manifest with greater age due to the tendency of higher-IQ people to age more gracefully. On the other hand, such research may indicate that the weak good genes factor is indeed causing this link between intelligence and health, and that this furthermore promotes a tendency for greater physical attractiveness in more intelligent people, as physical attractiveness is also generally linked to better health. | Judge et al. (2009), did find a small (''r'' = 0.16) correlation between looks and general intelligence,<ref>https://psycnet.apa.org/record/2009-06703-013</ref> however this may have been caused by his sample being middle aged. Intelligence is linked with greater health, and part of this may be attributable to lifestyle factors.<ref>https://www.statnews.com/2017/06/28/high-iq-children-longevity-study/</ref> Thus, the link between IQ and health may only become manifest with greater age due to the tendency of higher-IQ people to age more gracefully. On the other hand, such research may indicate that the weak good genes factor is indeed causing this link between intelligence and health, and that this furthermore promotes a tendency for greater physical attractiveness in more intelligent people, as physical attractiveness is also generally linked to better health. | ||
Furthermore, in the Wisconsin Longitudinal Study, there was a weak positive correlation between attractiveness rated in yearbook photos and measured IQ.<ref>seb on X: "Intelligence and ratings of attractiveness from high school yearbook photos correlate weakly, but positively within Whites. https://t.co/iRl6vByRfu" / X (archive.is)</ref> | |||
Also, in the National Longitudinal Study of Adolescent to Adult Health, there is a similarly weak positive correlation between interviewer-rated attractiveness and scores on the various cognitive tests administered in that study, of around the same magnitude in both sexes (~ 0.1 when corrected for low reliability of the attractiveness ratings in Add Health, Altmark22, 2024). | |||
In the cases of these studies, potential confounds exist. Grooming & personal presentation, as well as factors like fashion sense, are not controlled for, so it's not clear if this relationship between physical attractiveness and looks is centred on 'objective looks' or facets of self-presentation that are linked to IQ and enhance perceptions of physical attractiveness. | |||
It may also be the case that IQ is mainly linked to looks in the case of 'bad genes', or neurodevelopmental, chromosomal, or other genetic conditions that both negatively influence physical attractiveness and IQ. Earlier studies did find a significant effect for looks only among unattractive individuals,<ref>https://psycnet.apa.org/record/2002-00344-009M</ref> though Mitchem et al. did not find any evidence for such non-linear effects. The association was non-significant throughout the entire range of physical attractiveness and IQ examined. The study also examined if the environmental correlation between IQ and looks was negative, i.e if high IQ people are better looking on the genetic but not on the observed level due to the effects of different environmental factors. They discovered no evidence to support this claim. | It may also be the case that IQ is mainly linked to looks in the case of 'bad genes', or neurodevelopmental, chromosomal, or other genetic conditions that both negatively influence physical attractiveness and IQ. Earlier studies did find a significant effect for looks only among unattractive individuals,<ref>https://psycnet.apa.org/record/2002-00344-009M</ref> though Mitchem et al. did not find any evidence for such non-linear effects. The association was non-significant throughout the entire range of physical attractiveness and IQ examined. The study also examined if the environmental correlation between IQ and looks was negative, i.e if high IQ people are better looking on the genetic but not on the observed level due to the effects of different environmental factors. They discovered no evidence to support this claim. | ||