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So yes, Cartesian Dualism is still very outlandish post-Darwin.
Quadontology argues that there is not a simple duality but rather four distinct polarities or gradations (ontoclines) of being, each with a "yin" (matter" so to speak) and a "yang") ("spirit" polarity. In Cartesian dualism the "Yang" polarity of three of the parameters are confused and jumbled together. This constitutes the mind or spirit member of the duality. However as far as everyday physical mundane reality goes, the "Yin" polarity of these three parameters do indeed merge, in what is usually considered "physical reality". This constitutes the "matter" or "body" element. There is also no "duality" between the two polarities of each ontological axis, simply a sequence or gradation.
Derek Matravers introduces Descartes and Dualism.
Although much ado has been made in the cognitive sciences over Cartesian dualism, what has until recently been unquestioned in Descartes and both his materialist (Locke, Hobbes) and idealist contemporaries (Berkeley, Kant) is their ontology.