11-19-13 update. I first posted this articleFYI without digesting the results in detail. A subsequent comment (see comment section) brought my attention to a possible problem with a Heywood case. I tend to agree with that comment upon further review.
A new study that shows direct effect of comprehension-knowledge (Gc) and visual-spatial processing (Gv), and indirect effect of general intelligence (g), on reading comprehension of college students. Click on images to enlarge