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IQ tests are quite popular, but they seem to be lacking a scientific proof confirming their accuracy of measuring ones intelligence.

No matter how hard I've searched I haven't been able to find a scientific paper proving the result, all I could find was some questionable statistical studies but I am not interested in such, I am looking for a more fundamental proof, one that shows the relation of this test with the actual biological processes in the brain.

My guess would be that the only thing IQ tests measure is how good someone is at IQ tests, since one can actually get a good score due to training.

Another thing to keep in mind is that, people working in mathematics, physics and related sciences tend to get better scores and this can be explained by the fact that this is what they do, this is their job and they have spent a large amount of time studying patterns, but this however does not mean that they are necessarily smarter that others they are just trained at this.

A mathematician for example, given a sequence 2,3,5,7,... can see that the next term is 11 since this is a familiar sequence to him, but to an artist it may not be familiar at all.

Having said that, do IQ tests actually measure human intelligence? Is there a strict proof that confirms this?

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    If you want to test whether IQ measures intelligence, you have to measure intelligence. How do you propose to do so? – Bryan Krause May 17 '21 at 17:13
  • I am not an expert so I can't propose anything, this is just a question, in fact I work at something completely different, but given that we don't know how to measure intelligence then claiming that IQ tests do is absurd. –  May 17 '21 at 17:18
  • Well, one measure that the experts came up with is the IQ test. If you want to measure intelligence, you probably need some sort of test to do it, right? Otherwise you just give up and say "can't be measured". It may be absurd (and is often misused), but it's also useful. – Bryan Krause May 17 '21 at 17:50
  • But how can we use something we have no proof that is works. As I said in my question, a mathematician can easily find patterns in sequences because that's it's job, so acing an IQ test could mean that you are just a mathematician. –  May 17 '21 at 18:06
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    I'd suggest reading the Wikipedia page on IQ: https://en.wikipedia.org/wiki/Intelligence_quotient I think it will show you that you're not alone in your concerns, but also explain what IQ really is. https://en.wikipedia.org/wiki/All_models_are_wrong may be worth a read as well. – Bryan Krause May 17 '21 at 18:09
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    I agree with @BryanKrause that this question is not well defined - ie, what proof is there that any test measures what it purports to measure? In any case, I think this question is a duplicate of: What is the relation between measures, constructs and concepts? – Arnon Weinberg Jun 20 '21 at 07:25
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    @Kthamil You're suggesting a mathematician would ace an IQ test by virtue of being a mathematician. You're looking at it the wrong way, he is a mathematician because he is intelligent. So, in your example, he would be acing the IQ test due to his intelligence, not his occupation. – NetServOps Jun 21 '21 at 04:54
  • @NetServOps I don't agree that mathematicians in general are more intelligent that the rest of the population, they are just trained at this which makes them find some problems easier since they are familiar with them. I know this from personal experience since I myself am a mathematician currently pursuing a ph.d but I would not consider myself smarter than the next guy, I have learned some things and consequently find them easier than someone who has never seen staff like that. Returning to my previous example, a mathematician has seen many patterns so in an IQ test, he would recognize them. –  Jun 21 '21 at 19:09
  • @Kthamil You're doing a ph.d in mathematics, you'd be towards above average intelligence. An IQ test is not a maths test, though you do need a certain level of mathematics knowledge but the level required for an IQ test DOES NOT require you to have a degree in it. You mention pattern recognition, well recognising patterns is a skill many people have and its something you can improve upon. So your point about mathematicians having an advantage in pattern recognition is not true. I'm not a mathematician but my IQ is high, that fact alone is enough to dispute your claim. – NetServOps Jun 22 '21 at 01:12
  • It's true that many people can recognize patterns, never said the opposite, but mathematicians can do so not by necessarily being smarter but because of their familiarity with patterns. Here's an example, I saw a IQ type puzzle on Facebook recently and one guy answers it using mathematics, everyone who saw it, said "man you're a genius" but this is not necessarily true, he just was a mathematician and has seen such problems a million times, this was trivial knowledge for a mathematician, it's not that he was smarter, he just knew the technique to tackle the problem. It was experience. –  Jun 22 '21 at 07:31
  • Also you claim that IQ tests are not math tests, although there are some verbal questions, most of them are about pattern recognition which is a huge branch of mathematics, there are many mathematical techniques used to identify patterns and I am not only talking about numbers, modern mathematics studies much much more than just numbers so in a sense, IQ tests are math tests, but people who don't know mathematics don't see them as such. –  Jun 22 '21 at 07:40

2 Answers2

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It depends on the way intelligence is defined (which can be discipline-specific). For example, in the field of clinical psychology, intelligence is defined as a statistical correlation between different tasks that require intellectual (again, as agreed upon) effort.

If you define intelligence as correlations between different tasks that require "intellectual effort", then yes, but why would someone choose to do stuff like this for their job in the first place? Clinical psychologists/geneticists proposed (as you implied/hinted at in your post) that since the heritability of IQ increases with age, that it's as a sort-of feedback loop where people with a rough "heritable" edge seek more and more environments that reinforce those skills (Robert Plomin did work on this I believe).

For a fundemental take I would try and look up The Neuroscience of Intelligence by Richard J. Haier, one of the more "fundemental" results he found is that the people who scored better on certain IQ tests had more calory efficient brains, the heat of the brains correlated negatively with the test scores. But again, maybe that is still a post-hoc thing.

pep
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blazg_7S
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  • Haier also describes the abstract nature of "intelligence", of which the definition is a fundamental issue in discussions of measurement – pep Jun 25 '21 at 14:13
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There is no universally accepted definition of "intelligence", so there is no universally accepted measure of it. An IQ test can be argued to measure specific types of intelligence like pattern recognition, but may completely ignore other types of intelligence like creativity and social intelligence. IQ has been shown to be associated with many factors like income, educational attainment, job performance and incarceration rates, so IQ tests clearly measures something meaningful and associated with many aspects of one's life, but whether you call that "intelligence" is open to debate. It's reasonably well accepted that an IQ test can measure specific kinds of intelligence, but there is no way to even define, much less quantify, intelligence in a general sense.

Nuclear Hoagie
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    What are the research papers that IQ tests clearly measure something meaningful? Can you provide some studies? My question was to provide literature. –  May 17 '21 at 17:28
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    Welcome to Psychology.SE. Please visit our site [tour]. There are a lot of bold claims in your answer without corroborated evidence. We work differently to many SE sites, where we have a strict policy that all answers should be backed up with reliable references so that the answer can be independently verified, regardless of the reader's/answerer's background. If you still have trouble with this, feel free to visit the [help] or [meta]. Unreferenced claims can be challenged and lead to deletion of your answer. – Chris Rogers May 22 '21 at 12:06