Philosophy of mind is the branch of philosophy that attempts to account for a very difficult problem: why there are apparently two different realms of phenomena, physical and mental, that are at once tightly connected and yet as different from one another as two things can possibly be.

Broadly speaking you can think that the mental reduces to the physical (physicalism), that the physical reduces to the mental (idealism), both reduce to some other third thing (neutral monism) or that neither reduces to the other (dualism). There are many arguments for dualism but I’ve never heard a philosopher appeal to “magic spirits” in order to do so.

Here’s an overview: https://plato.stanford.edu/entries/dualism/