Philosophy of mind
Philosophy of mind is the analysis of the nature of the mind, consciousness and its relationship to the physical body.
There are a number of different schools of thought generally addressing the philosophy of mind, including dualism, monism, behaviorism, identity theory, eliminative materialism, and functionalism.
Dualism
Dualism is thought to be the most common, natural view of the mind-body relationship. Dualists argue that the world is made up of at least two distinct substances: the material and whatever makes up the mind (generally, but not always, called the spirit).
Monism
Monism refers to the philosophical view that there is only one type of material. While this could be physical (see: eliminative materialism), monism is generally used to refer to the school of thought where only the spiritual substance exists.