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One study suggested there is a sweet spot for attractiveness at an IQ of 120 and with declining attractiveness above, which agrees with previously postulated hypothesis that too much of a desirable trait is detrimental. However, it is not clear whether this reflects actual mating choices.<ref>https://www.researchgate.net/publication/321640585</ref> The sweet spot being way above the mean demonstrates that intelligence is still under positive sexual selection. | One study suggested there is a sweet spot for attractiveness at an IQ of 120 and with declining attractiveness above, which agrees with previously postulated hypothesis that too much of a desirable trait is detrimental. However, it is not clear whether this reflects actual mating choices.<ref>https://www.researchgate.net/publication/321640585</ref> The sweet spot being way above the mean demonstrates that intelligence is still under positive sexual selection. | ||
There is, however, also evidence for [[assortative mating]] in terms of intelligence. This had lead to speculation that this assortative mating will lead to lower social mobility among the less intelligent,<ref>https://www.sciencedirect.com/science/article/abs/pii/S0191886913006399</ref> perhaps even leading to caste systems based on IQ forming.<ref>https://westhunt.wordpress.com/2012/01/13/class-caste-and-genes/</ref> However, some have said these claims have never been substantiated.{{citation needed}} | There is, however, also evidence for [[assortative mating]] (people preferring people with similar traits to themselves) in terms of intelligence. This had lead to speculation that this assortative mating will lead to lower social mobility among the less intelligent,<ref>https://www.sciencedirect.com/science/article/abs/pii/S0191886913006399</ref> perhaps even leading to caste systems based on IQ forming.<ref>https://westhunt.wordpress.com/2012/01/13/class-caste-and-genes/</ref> However, some have said these claims have never been substantiated.{{citation needed}} | ||
A study conducted by Halpern et. al (2000) that used a total sample of N = 11,696 adolescents from two longitudinal surveys of adolescent health and sexual behavior, measured the IQs of participants using a simple and equivalent measure of IQ—The Peabody Picture Vocabulary Test Revised (PPVT–R)—which has a correlation of .64 with the Wechsler Intelligence Scale for Children, indicating that the test is a good measure of general intelligence. | A study conducted by Halpern et. al (2000) that used a total sample of N = 11,696 adolescents from two longitudinal surveys of adolescent health and sexual behavior, measured the IQs of participants using a simple and equivalent measure of IQ—The Peabody Picture Vocabulary Test Revised (PPVT–R)—which has a correlation of .64 with the Wechsler Intelligence Scale for Children, indicating that the test is a good measure of general intelligence. | ||