Property dualism

Property dualism describes a category of positions in the philosophy of mind which hold that, although the world is composed of just one kind of substance — the physical kind — there exist two distinct kinds of properties: physical properties and mental properties. In other words, it is the view that non-physical, mental properties (such as beliefs, desires and emotions) inhere in some physical substances (namely brains).

Substance dualism, on the other hand, is the view that there exist two kinds of substance: physical and non-physical (the mind), and subsequently also two kinds of properties which adhere in those respective substances. Substance dualism thus has a much harder time with the mind-body problem. Both substance and property dualism are opposed to physicalism.

Emergentism is the idea that increasingly complex structures in the world give rise to the "emergence" of new properties that are something over and above (i.e. cannot be reduced to) their more basic constituents. The concept of emergence dates back to the late 19th century. John Stuart Mill notably argued for an emergentist conception of science in his 1843 System of Logic.

Applied to the mind/body relation, emergent materialism is another way of describing the non-reductive physicalist conception of the mind that asserts that when matter is organized in the appropriate way (i.e., organized in the way that living human bodies are organized), mental properties emerge.

Non-reductive physicalism is the predominant contemporary form of property dualism according to which mental properties are mapped to neurobiological properties, but are not reducible to them. Non-reductive physicalism asserts that mind is not ontologically reducible to matter, in that an ontological distinction lies in the differences between the properties of mind and matter. It asserts that while mental states are physical in that they are caused by physical states, they are not ontologically reducible to physical states. No mental state is the same one thing as some physical state, nor is any mental state composed merely from physical states and phenomena.

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