It's an interesting point actually. I feel pretty good in the head dept most of the time with the odd memory lapse, but then I read people who have got transplants who talk about their minds feeling so much clearer.. so I wonder if it's just like any other facet of ESRD - specially in a chronic condition where it moves slowly - that maybe the "fog" comes along so slowly that you sort of get used to it, and adjust to it within yourself, so it doesn't seem like it's anything significant - sort of like walking around with dirty glasses - you can see but it's not as good as if they were shiny clean.