Food and bathroom break. Another thousand words or so. Two hours' nap.
I need to take a break, because I've noticed I've started typing complete gibberish. And this is the easy stuff (sc. the stuff I know something about); when I get onto the neuroanatomy I shall have to keep my wits very much about me.
Still, I've broken the back of cueing. It's now really a matter of finishing the section on auditory cueing (verbal commands, metronomes and music) and then groping the literature for the stuff I've missed out.