"A little less intransigent, maybe. Depending. Have you? Not a lot of volunteers coming through your department?" He couldn't imagine many healthy people were willing to open their brains up for the good of scientific progress, but of course every study needed its controls. He'd never even considered going into a field that required dealing with human beings who weren't his colleagues, so it was a problem he'd never run up against - and that was definitely a good thing. Even without his medical problem, he found constant contact with his fellow man to be pretty trying, and having to be ethical with them would have been a serious burden. "Or do you not have to rely on a self-selecting sample? That would be nice." Although digging through the memories of Azkaban residents couldn't be very helpful, either.