Abstract

The extensions of response-dependent concepts are a priori connected with the subjective responses that competent users of that concept have in normal conditions. There are two strategies for specifying normal conditions for response-dependent concepts: topic-specific and topic-neutral. On a topic-specific specification, a characterization of normal conditions would be given separately for each response-dependent concept (or a non-trivial subset of response-dependent concepts, such as our colour concepts), whereas a topic-neutral specification would be given in a uniform way for all response-dependent concepts. In this paper I argue, using a thought experiment, that only topic-neutral specifications will deliver the a priori knowledge constitutive of response-dependence.