Sadly, I can only share the synthesized results of years of reading—I don’t keep track of where my ideas come from (though I do try to avoid known-bad sources)
#1 is seen with SAT scores—taking the test a second time / taking a prep course improves the median student’s score by ~10 percentage points. I (and others) attribute this to improvements in the “IQ test taking ability” portion of the SAT, not the “have memorized vocabulary and rules of math” portion.
#3 is clearly seen in results from twin studies, adoption studies, and just looking at the world (ie we see a wider range in “ability to do things we would predict high IQ people to be better at” among people with similar childhoods than we do among people with dis-similar childhoods in extended families.
Sadly, I can only share the synthesized results of years of reading—I don’t keep track of where my ideas come from (though I do try to avoid known-bad sources)
#1 is seen with SAT scores—taking the test a second time / taking a prep course improves the median student’s score by ~10 percentage points. I (and others) attribute this to improvements in the “IQ test taking ability” portion of the SAT, not the “have memorized vocabulary and rules of math” portion.
#3 is clearly seen in results from twin studies, adoption studies, and just looking at the world (ie we see a wider range in “ability to do things we would predict high IQ people to be better at” among people with similar childhoods than we do among people with dis-similar childhoods in extended families.