fancier mental infrastructure
How fancy? I solved it by thinking in terms of “canceling each other out”. So if a small circle is in cell 1 and cell 2 of a row, they cancel each other out and don't appear in cell 3, but if the circle is only in cell 1 or cell 2, it is preserved. The intuition of canceling each other out is taught to children as early as they're taught fractions: (2*3)/(3*5) = 2/5, because if 3 is both in numerator and denominator, you cross it out. This doesn't require knowing anything about logical operators.
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I've never had the experience of thinking that a saw the pattern and being wrong.
Most Less Wrong readers' performance on Raven's Matrices would be between 2 SD and 3 SD above the mean, and I'd guess that the threshold for seeing the pattern in this particular item is in the same range. Rapidity with which one sees the answer probably gives incremental predictive power, but I'd guess that the improvement in predictive power would be much less than the improvement coming from testing untimed performance on more difficult items.
I got the answer in under 2 minutes (didn't time it exactly). However, when I first identified my answer candidate (answer 2), it was probably about two thirds of the way in. I got the correct answer by going across at first, but then spent additional time double checking my work using columns, and then double checking my answer before "committing".
I've taken a couple of online Raven's Matrices type tests in the past, but that was a while ago, so I don't believe memory played too much of a role. However, I seem to have internalized the idea that IQ tests are trying to bait you with obvious answers, and as a result, I end up taking too long double checking my work.
I suppose the only way to get over this lack of confidence in my intuition is with practice, but I'm wary of diluting the feedback I get from the occasional IQ test due to the 'practice effect'.
It's a bit of a catch-22. Any thoughts would be appreciated.