Everybody who has researched IQ has come across the twin studies which amply prove that IQ is not immutable.
Yes, there are a number of lines of evidence that IQ is far from immutable at the individual level, even though environmental influences on IQ are very poorly understood. Because such environmental influences are poorly understood, it is not at all clear that societal increases in IQ can't continue.
I've enjoyed hearing from several well known psychologists about this, including some of the doyens of twin research, as I participate in the journal club in individual differences psychology and behavioral genetics
at the university where those researchers are based this fall semester. There is always lively discussion on what the data show, and what the data don't show. Thus far, there are no data to show a hard upper limit on how much individual academic achievement might raise with the best interventions, nor any predictable limit on how much secular increases in societal levels of IQ might continue.
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Everybody who has researched IQ has come across the twin studies which amply prove that IQ is not immutable.
Yes, there are a number of lines of evidence that IQ is far from immutable at the individual level, even though environmental influences on IQ are very poorly understood. Because such environmental influences are poorly understood, it is not at all clear that societal increases in IQ can't continue.
I've enjoyed hearing from several well known psychologists about this, including some of the doyens of twin research, as I participate in the journal club in individual differences psychology and behavioral genetics
http://www.psych.umn.edu/courses/fall09/mcguem/psy8935/defau...
at the university where those researchers are based this fall semester. There is always lively discussion on what the data show, and what the data don't show. Thus far, there are no data to show a hard upper limit on how much individual academic achievement might raise with the best interventions, nor any predictable limit on how much secular increases in societal levels of IQ might continue.