Glad to see there is a study that has caught up to one of the things I have been saying for years. First and foremost,
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[email protected] and the speed to which it is recalled. The better a person's recall (or photographic memory) the higher their IQ, provided they have been taught the material covered. For example, a 5 year old may have a grasp of addition and subtraction, but multiplication and division would be unusual concepts...algebra, geometry's theorems and proofs as well as trigonometry functions would be alien for a 5 year old and would not be tested by any sane IQ test for the age level.
Can a 5 year old do multiplication and division? Yes, of course they can. They can understand the rational behind it if properly explain to them as well. But doing so is not an indication of intelligence unless they can quickly figure out basic concepts such as multiplication is commutative just as addition is.
So basically knowledge is the sum of information that you know, IQ is how quickly you can access that knowledge and intelligence is how you adapt that information outside the original data. For example 1 x 3 = 3 is knowledge. Answering without calculating or counting on fingers is a degree of IQ, figuring out on your own that any number multiplied by 1 is always that original number is a level of intelligence...if you were told that fact, then it is knowledge and remembering that you were told it is IQ.
Hope I explained that well enough.