There's no good definition of intelligence, and certainly not one that can be operationalized in one or two numbers. So instead, this study correlates the outco

There's no good definition of intelligence, and certainly not one that can be operationalized in one or two numbers. So instead, this study correlates the outcome of quite a few tests that are commonly assumed to correlate with intelligence, and correlates it with an (also not well-understood) measurement of the brain. "Whole-brain connectivity" is best at predicting the outcome of the tests, but I couldn't find how they define it.