I'm not a fan of IQ and other similar "intelligence measures," for a variety of reasons which I can more or less divide into three groups.
First, it's not at all clear to me that they are measuring "intelligence" in the first place. Here's an experiment for you all to try. Ask 10 of your friends to define intelligence. Some of them will probably attempt to define intelligence in terms of IQ; however, since this is ridiculously circular (intelligence is defined by IQ, which is a measure of intelligence, which is defined by IQ, which is a measure of intelligence, etc.), refuse to accept this definition and ask for a real one. How many definitions do you end up with? Probably very close to--or exactly--10. "Intelligence" is a fuzzily defined concept which means different things to different people. Since we can't even put a precise finger on what "intelligence" is, how can we possibly have a test to quantify it?
Second, the predictive validity of knowing a person's IQ is disturbingly low. Even the strongest correlations between IQ and objective measures of ability and achievement rarely exceed a Pearson's r of .3, meaning that knowing someone's IQ only allows you to account for at most 9% of the variance in meaningful factors such as their annual income, etc.
Third, the concept of IQ makes two presuppositions about intelligence that I find untenable. It presupposes that there is some real (or at least useful) psychological construct which we can label general intelligence in the first place, and it presupposes that this construct, if it does "exist" (quotation marks are necessary here to remind ourselves that if a construct is useful, we may as well say that it exists, even if we can't touch it), is static and immutable. My view, on the other hand, is that even if there is such a thing as general intelligence, it doesn't seem to be a very useful way to conceptualize human ability, and also that this construct is fluid to the point where it would be more accurately labeled "current general intelligence." It is a well known fact that practicing taking IQ tests repeatedly will substantially increase the IQ scores that one receives. Since it is unreasonable to assume that this practice actually increases someone's "intelligence," we are forced to conclude either that (a) IQ tests don't measure intelligence at all, but rather they simply measure one's ability to take IQ tests, or (b) that intelligence is highly fluid to the point that it's not clear that we get much out of measuring it in the first place. Neither of these conclusions bode well for purveyors of IQ testing.
Given these very serious issues, I am constantly amazed that people put so much stock into IQ tests. It's time that we stop trying to reduce people to single numbers and assess them holistically. I have no idea what my IQ is and have no interest whatsoever in finding out.
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