Howard Sankey

The aim of this paper is to make a distinction between a number of different varieties of cognitive relativism. The focus is cognitive relativism rather than relativism about morality or cultural practicies. I distinguish between five varieties of cognitive relativism: relativism about rationality; relativism about truth; relativism about knowledge; relativism about reality; conceptual relativism. The paper may also be found in my book, Rationality, Relativism and Incommensurability (chapter one).

This paper reconsiders the challenge presented to scientific realism by the semantic incommensurability thesis. A twofold distinction is drawn between methodological and semantic incommensurability, and between semantic incommensurability due to variation of sense and due to discontinuity of reference. Only the latter presents a challenge to scientific realism. The realist may dispose of this challenge on the basis of a modified causal theory of reference, as argued in the author’s 1994 book, The incommensurability thesis. This referential response has been the subject of a charge of meta-incommensurability by Hoyningen-Huene et al., who argue that the realist’s referential response begs the question against anti-realist advocates of incommensurability. In reply, it is noted that a tu quoque rejoinder is available to the realist. It is also argued that the dialectical situation favours the scientific realist, since the anti-realist defence of incommensurability depends on an incoherent distinction between phenomenal world and world-in-itself. In light of such incoherence, and a strong commonsense presumption in favour of realism, the referential response to semantic incommensurability may be justifiably based on realism.