My mother in law can carry on an intellectual conversation superbly. She was and is highly intelligent. She has been in the care home for about seven months minus her stays in the hospital for dehydration before being diagnosed and then a major heart attack about four months ago. She has continually the past seven months wanted to go home and been agitated about her living situation. I asked the staff if she is just sundowning when she gets agitated and wants to go home and to know why she is there. The staff said well she is unique, they can be having a stimulating intellectual conversation with her and right in the middle she will change and become argumentative and not remember the conversation they were just having. I realize short term memory is majorly affected with dementia, but the other residents there don't remember this morning, but they do remember one minute ago. On one hand it seems she is late stage dementia, because of this, but her intellectual function is not impaired. Just wondering if this type of behavior and memory loss occurs in most patients? Also she has not memory of her heart attack months ago and her memory of her early life seems to be waning. Just wondered if others have had similar experiences, and how long do demenia patients go on like this before they lose communication skills, on average? Just wondering in general what to expect because it seems there is no way to know from day to day .