Just a quick note: wonder if "typing memory" (physical memory of the locations of the letters on the keyboard - which you attain as the result of typing a lot) also has an effect on this.

This idea just popped into my head because there was one word in the quoted text (ansaylis) which I couldn't make out by reading it but, when I typed it on the keyboard my fingers simply had a will of their own and I wrote "analysis" by accident, only realizing what I had typed when I read it on the screen.