I'm more apt to think that ghosts are dimensional imprints more than a conscious ...whatever.
I can't honestly say that I believe in ghosts, but I enjoy ghost stories, and try to keep an open mind. Even all the animals have consciousness. My daughter believes that animals are dumber than people, but I insist, that in the event of a natural disaster, the animals have a better chance of survival than humans. So who is smarter, really? I could be wrong.