Other Biological Associations
Height is correlated with intelligence (r~.2), but this correlation has not generally been found within families (i.e., among siblings), suggesting that it results from cross-assortative mating for height and intelligence. Myopia is known to be associated with intelligence, with a correlation of around .2 to .25, and this association has been found within families, too.
There is some evidence that a g factor underlies the abilities of nonhuman animals, too. Several studies suggest that a general factor accounts for a substantial percentage of variance in cognitive tasks given to such animals as rats, mice, and rhesus monkeys.
Read more about this topic: g Factor (psychometrics)
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