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Jonii comments on How to test your mental performance at the moment? - Less Wrong
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http://www.iqout.com/index.php?lang=EN
This IQ-test could work. The questions are generated on-the-fly to match your level, and there is really little time to give the answer, so alertness is needed too.
That was rather interesting. I got a 137 but beyond the first few questions I wasn't sure of any of them. Usually the best I could do was identify a possible sub-pattern, narrow down the options based on that, and make an educated guess. I think I did better on the ones with varying numbers of dots and lines compared to the ones with just the shapes moving and morphing.
Presumably if somebody took that test repeatedly (or possibly once if they're smarter than me), they'd figure out the class of algorithms being used and it would lose most of its value for determining immediate mental performance.
Actually, nope, I think that's exactly why it would make such an excellent benchmark for mental performance. The algorithms are surprisingly simple and after learning those, it's all about applying that limited library to the problem. Fast. If your performance is above average, you can do this a lot easier and faster and with less errors compared to a situation where you're not doing as well.