I thought, and still think, that confusion can come from the mind working faster than the body can cope with output or input. I can type about a hundred words per minute, and I still mess up the output.

To grasp words as a gestalt is quite an accomplishment. To grasp a sentence is more. To grasp a paragraph -- or, as some do, an entire page -- is really quite amazing. (I include comprehension herein, as I've sat through whole books, gazing at the pages and taking in nothing. Sort of like some sermons or university lectures.)