This has nothing to do with stomatopods, so I shouldn't answer it. However, since I do know a bit about the subject, let me say that there is nothing wrong with using "IQ" tests to measure various types of performance as long as those tests are applied within a group with similar experience. As soon as comparisons are made across cultural boundaries, the validity of the tests becomes questionable.
As for brain size and IQ, there is basically no correlation in humans as long as you do not approach the extreme pathological limits. For example, if one included individuals that were considered microcephalic, they would score poorly on an IQ test.
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