It's ok to ask those questions @
TunedOut. As I mentioned, so many choose to embrace the paranormal. However, there also can be explanations that show that there is a scientific reason for these visions, hallucinations, and why we can see something that isn't really there. We have been learning more and more all the time about the human brain and what our brains can do that can confuse us. It's ok to choose either way as some do choose and always have.
My own brain created an experience of my literally seeing that hospital room full of people, I was in fact hallucinating. I saw it with my eyes, it felt REAL to me. Yet, it was not real, no one else in that room experienced it and it has been learned that some react to anesthesia by hallucinating. John Nash had to learn that even though he had these visions that felt very real to him, they were in fact not real. My sister happened to see this light coming down the front stairs, she immediatly decided it was a ghost and that my parent's house is haunted. She had a ouigi board and seances and there were never voices at all. What she saw was NOT a ghost, it could have been mistaken as one, but all it was is how the car lights coming down the road and through a turn came into through the window and hit the wall on the front stairs making it look like a ghost coming down the stairs when that isn't what it was AT ALL. I have seen it for myself, it's just the lights of cars and that house is on a fairly busy road set close to the road and cars coming down the road in both directions often lead to the headlights shining through the windows creating what looks like ghosts but are not.
Can my MIL be visiting my FIL? It would be nice to think so, however, it scares him and it's very probable that his brain is so used to seeing her in that chair over so many years, that his mind just sees her there. It's very similar to a flashback. I have had those and they can be scary but I know it's not real, only something I experienced in my past. However, once I acknowledge the flashbacks, "yes that happened, but it's not happening now"? They faded away. Yet, when I experienced them, they sure did frighten and confuse me.
Lots of people want to believe TunedOut, and it's been like that probably since humanity began. It can cause more fear in someone though, and stress and feeling unsafe than is healthy for that individual. Sometimes it can be comforting and people like to believe because of the need for that comfort. Other times it can be very unheathy for someone and cause them to break down from fear. However, our brains collect a lot more information than we realize, and this is what we collect from when we are small. I love to see a good ghost movie, yet, I have never personally seen an actual ghost, and I lived for the longest in my parent's home, and the only thing that was there were the headlights, no actual ghosts. You can HEAR the cars going by when the lights come through the windows that present what can look like ghosts, but it's not really a ghost.