Michael McKinsey noted that this view implies the impossibility of a priori knowledge of objects in subjectively equivalent worlds to argue that this view is incompatible with Cartesian skepticism. An argument advancing this view considers an individual who has incorrect beliefs about arthritis being located in the thigh. This view’s commitment to the causal constraint on reference implies that the proposition (*) “we are brains in a vat” is self-refuting. (10[1])An argument advancing this view posited an identical planet to our own where water (10[1])is “XYZ” instead of “H20.” For 10 points, name this position supported by the “Twin Earth” thought experiment, which posits that the content of mental states is dependent on factors outside of the mind. ■END■ (10[1]0[6])