[probizzle]

I read a linguistics paper that went farther and analyzed human reading even more. It was extremely interesting.
You know WHY READING ALL CAPS IS SLOWER THAN READING NON-ALL-CAPS? Because your eye looks at the word shape (like "word" has three small letters, and one tall one) and lots of other things while reading to understand stuff. I'll look for the paper later, and post if i find it.
Also, your eye/brain doesn't read everything. Letters (as well as words) are constantly skipped, and you interpolate what you skipped. TO see what I mean, read the above post slowly, and then speed-read it. You'll see you'll have an easier time speed-reading it because you are skipping so many letters anyways.

(gone looking for that darned paper)