International audienceMany debates in philosophy of mind and cognitive science focus on whether folk or scientific psychological notions pick out cognitive natural kinds. Examples include memory, emotions, and concepts. A potentially interesting type of kind is kinds of mental representations (as opposed, for example, to kinds of psychological faculties). This chapter outlines a proposal for a theory of representational kinds in cognitive science. It argues that the explanatory role of representational kinds in scientific theories, in conjunction with a mainstream approach to explanation in cognitive science, suggests that representational kinds are multilevel. This is to say that representational kinds’ properties cluster at different leve...