Is / are there any scientific studies on factors which affect the general intelligence (g) factor?
I did a Google search, but could not find any academic papers on the topic.
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Sign up to join this communitySo you're basically asking what are the causes of interpersonal differences in intelligence as typically measured by standardised psychometric tests. This question forms the basis for a large proportion of the literature on intelligence. For example see a journal like Intelligence.
For a review you could read Intelligence: Knowns and Unknowns
A few quick observations include that