If I'm following, you're suggesting that the distinction being introduced here is between two different set of cognitive processes, one of which (call it A) is understood as somehow more natural or innate or intrinsic to the human mind than the other (call it B), and creative thinking is part of B.

No, I'm not suggesting that. That may be what Okeymaker is suggesting; I'm not quite clear on his/her distinction either. What I was originally addressing, however, was komponisto's assertion that "high IQ" is merely "high processing speed and copious amounts of RAM", which I denied, pointing out that "high processing speed and copious amounts of RAM" alone would surely not have been enough to invent calculus, and that "creative thinking" (whatever that means) is required as well. In essence, I was arguing that "high IQ" should be defined as more than simply "high processing speed and copious amounts of RAM", but should include some tertiary or possibly even quaternary component to account for thinking of the sort Newton must have performed to invent calculus. This suggested definition of IQ seems more reasonable to me; after all, if IQ were simply defined as "high processing speeed and copious amounts of RAM", I doubt researchers would have had so much trouble testing for it. Furthermore, it's difficult to imagine tests like Raven's Progressive Matrices (which are often used in IQ testing) being completed by dint of sheer processing speed and RAM.

Note that the above paragraph contains no mention of the words "natural", "innate", or any synonyms. The distinction between "natural" thinking and "synthetic" (I guess that would be the word? I was trying to find a good antonym for "natural") thinking was not what I was trying to get at with my original comment; indeed, I suspect that the concept of such a distinction may not even be coherent. Furthermore, conditional on such a distinction existing, I would not sort "creative thinking" into the "synthetic" category of thinking; as I noted in my original comment, no one taught Newton the algorithm he used to invent calculus. It was probably opaque even to his own conscious introspection, probably taking the form of a brilliant flash of insight or something like that, after which he just "knew" the answer, without knowing how he "knew". This sort of thinking, I would say, is so obviously spontaneous and untaught that I would not hesitate to classify it as "natural"--if, that is, the concept is indeed coherent.

It sounds as though you may be confused because you have been considering Okeymaker's and my positions to be one and the same. In light of this, I think I should clarify that I simply offered my comment as a potential explanation of what Okeymaker meant by "creative thinking"; no insight was meant to be offered on his/her distinction between "natural" thinking and "synthetic" thinking.