I ran across this today while looking for something else; it is an uncorrected proof of a paywalled article based on a review of 318 functional neuroimaging based reserach papers. The results suggest there is a neural basis for multiple intelligences (and hence, learning styles as well) (yes, I know there's a difference between multiple intelligences and learning styles). Now I am not a fan of fMRI at all, but I found the article interesting.