I mean I don’t really need any studies. Was Einstein as good of as a writer as Shakespeare? Nope! Although I’m sure he was generally “smart” his main focus of intelligence was physics.
However, after re-reading my comment I was a little unclear. When I said:
“Intelligence isn’t general it’s specific“
I should have said:
“My (And I think others as well) definition of intelligence is how well educated you are in a specific subject. I would never ask someone how smart they are (not useful) but I could ask if they are good at calculus (intelligence in math)”