The interesting thing about intelligence is that different kinds of intelligence are positively correlated It's a bit more than that. If you look at all the d

The interesting thing about intelligence is that different kinds of intelligence are positively correlated It's a bit more than that. If you look at all the different measure of intelligence that people have come up with like vocabulary, finding patterns in shapes, SAT scores, etc, and do a factor analysis there seems to be more or less a single factor behind the correlation. Some of these, like vocabulary, have an additional large effect from training. Some, like vocabulary and SAT verbal scores, have a strong correlation independent of the the rest of these varied scores. But in general there seems to be one factor, the hypothetical g, that explains why everything is correlated together. And it seems to explain part of other test results too that don't seem to be what we would normally consider intelligence, like the classic reflex test that measures how long it takes you to press a button after a light turns on. IQ tests try to measure this 'g' by using a number of different subtests chosen to not respond strongly to practice. But these, like all tests, have a certain amount of noise and shouldn't be taken as absolute truth.