Logical aliens and where to find them

Abstract

This paper is concerned with Frege’s logical aliens argument against psychologism in logic. The paper argues that this argument becomes too radical in the context of current philosophy in logic. The possible answer to Frege’s argument could be inspirited by the philosophical ideas of later Wittgenstein: we play different language games, and some of them are logical games. However, different people have different criteria of certainty and not all of them can play logical games. This gives new comprehension of the normativity of logic that shows that there are no logical aliens in absolute sense. This view can give in turn a new understanding of what rationality is and show why logic and psychology should interact.