Not sure if I can articulate this well, but I wonder if you’re focusing too much on ghosts while evaluating this thought experiment? Couldn’t option three be rephrased as; “There may be something in this environment which can hurt me. All defence systems on!”, without the fear being specifically of ghosts? In other words, couldn’t your subconscious be picturing scary thing, and not, specifically, ghost?
Not sure if I can articulate this well, but I wonder if you’re focusing too much on ghosts while evaluating this thought experiment? Couldn’t option three be rephrased as; “There may be something in this environment which can hurt me. All defence systems on!”, without the fear being specifically of ghosts? In other words, couldn’t your subconscious be picturing scary thing, and not, specifically, ghost?