Of course there are. Your best bet would be to look up undergraduate psychology textbooks.
I think I know your train of thought: "psychologists say X stimulate fear" and "I put X in my game", hence "my game is scary".
Unfortunately, "what to put in a game/movie/book etc to make it scary" is a deep topic that will take a long time to unravel. The shortest answer from biology would be to pump the body with chemicals that induces fear...sell drugs lol.
As I said I'm not looking for a recipe.I am aware there isn't one because of two things because if it somehow existed then everyone would be doing it.
I'm just a bit confused on where to start reading about these things, and very much afraid on loosing time reading irrelevant things.
I am trying to make a game in my free time because I want to explore some ideas, so i need to optimize everything.
I am aware that I can do a google search about this, witch I did, but I found unsatisfactory results in tings related to psychology and games. The answer to what I am trying to find out more about seems to be more in the psychology field rather than in game development.
Of course If i find a paper that says that x stimulates fear, I will try to see if it works in a game and how it can be improved upon:).
Well I was kind of optimistically hoping for a shortcut or some sort of tutorial (like the ones you find for programming subjects)
Nevertheless it seems that I need to explore this path on my own.If I find things that I consider relevant I will share them .
Thanks for all your replies.