I think this is one of the small comforts, that reassuring, welcome memories of childhood, close family experiences, remain when more basic, functional recall has subsided. So long as you aim to minimise, as you say, Malky, the anguish prompted by trying to force a response to information that no longer makes sense, they are to some extent at least, in a warm, fuzzy, happy place. Not always, and not fully. But it is something.