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Interesting insight.  My experience was with an Alzheimer's patient progressing through initial diagnosis to death over 10 years later.  One of the things that I found interesting was just how much this man attempted to mask his confusion.  He had recognized the unreliability of his own perceptions.  He used logic and reasoning to determine what components of the information he was receiving was being responded to by other people.  He was quite convincing to casual aquantainces and inexperienced doctors.