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What is the strength of the correlation between IQ and intelligence where by intelligence I mean the "performance of brain" - the general efficiency of solving mental tasks?

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    $\begingroup$ How do you propose to measure "the general efficiency of solving mental tasks" so that it can be compared to IQ? $\endgroup$
    – Bryan Krause
    Mar 2 '20 at 16:25
  • $\begingroup$ @BryanKrause As I'm not a psychologist myself, I'd guess an IQ test could be a good way to measure that. :) But I know the method is under a big fire so I was just interested if anyone tried to study that. For instance, I've read in Cognitive psychology by Eysenck that intelligence is best expressed by axon connectivity efficiency (more than by the number of neurons divided by the weight of the body). But as I'm not an expert myself, I don't know what the current consensus on measuring intelligence is. $\endgroup$
    – Probably
    Mar 2 '20 at 20:18
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    $\begingroup$ Yeah, that's what I was getting at :) These things are hard to measure, and they are probably measuring the wrong thing anyways (that is, assuming it's possible to map "intelligence" to something with only 1 dimension is almost certainly losing a ton of information; you'd have the same issue if you tried to measure "athletic ability" and included professionals in basketball, bowling, curling, and football). In trying to make your question a more answerable one, it might make more sense to ask for alternatives to IQ (kind of broad, but maybe okay) or tests to compare to. $\endgroup$
    – Bryan Krause
    Mar 2 '20 at 20:28
  • $\begingroup$ Related: Is there scientific evidence that IQ tests measure intelligence? $\endgroup$
    – Arnon Weinberg
    Jul 30 '21 at 18:05

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