 A thesis opposed to experience-content externalism is experience-content internalism. Put roughly, this is the thesis that experience content is determined entirely by the individual’s intrinsic properties. Total experience-content internalism is the thesis that all experience content is determined by the individual’s intrinsic properties (i.e., that two subjects alike in all intrinsic respects will have exactly the same experiential contents). Partial experience-content internalism is the thesis that there is a sort of experiential content that is determined by a subject’s intrinsic properties (i.e., two subjects alike in all intrinsic respects will have the same experiential contents of this sort. This thesis allows that experiences may also have some externally determined contents. Total experiential internalism is defended by Segal 1991 and Matthews 1985; partial experience-content internalism is defended by Chalmers 2004.