- 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, Extension and Mind, which together were to be taken as two of an infinite set of attributes comprising God (or, Nature).
- 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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