- For the Canadian constitutional theory, see Double aspect
In the philosophy of mind, double-aspect theory is the view that the mental and the physical are two aspects of, or perspectives on, the same substance. The theory's relationship to neutral monism is ill-defined, but one proffered distinction says that whereas neutral monism allows the context of a given group of neutral elements to determine whether the group is mental, physical, both, or neither, double-aspect theory requires the mental and the physical to be inseparable and mutually irreducible (though distinct).
Double-aspect theorists include:-
- Baruch Spinoza, who believed that the Existence had two aspects, God and Nature, whereas most subsequent dual aspect theorists accept a duality of Mind and Matter.
- There is a dual-aspect interpretation of Immanuel Kant's noumenon.
- Arthur Schopenhauer, who considered the fundamental aspects of reality to be Will and Representation.
- Gustav Fechner
- George Henry Lewes
- Carl Gustav Jung
- Wolfgang Pauli
- John Polkinghorne
- Thomas Nagel. 
- David Chalmers who explores a double-aspect view of information, with similarities to Kenneth Sayres' information-based neutral monism.
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