Mind–body dualism
Ontological dualism makes dual commitments about the nature of existence as it relates to mind and matter, and can be divided into three different types:Substance dualism is a type of dualism most famously defended by René Descartes, which states that there are two kinds of foundation: mental and body. This philosophy states that the mental can exist outside of the body, and the body cannot think. Substance dualism is important historically for having given rise to much thought regarding the famous mind–body problem. Substance dualism is a philosophical position compatible with most theologies which claim that immortal souls occupy an independent realm of existence distinct from that of the physical world.
French philosophy
The Duration can only be grasped through intuition, the sympathy by which one is transported into an object to grasp what is unique and ineffable within it. Intuition is a complete philosophical method that involves placing oneself within the Duration, and expanding it into a continuous heterogeneity, differentiating the extremities within it to create a dualism, before showing them to in fact be one. An example of this is Duration itself, which is neither a multiplicity or a unity. But depending on which point of view one recreates it from, one will either reconstruct it as a unity or a multiplicity. Hence substance pluralism and substance monism are in fact two representations of the same phenomenon.