Abstract: Contrary to what Descartes argued many centuries ago, the self seems far from being a simple and indivisible entity, easily accessible to personal scrutiny. In this paper I will endorse an anti-cartesian attitude, starting from two different perspectives. On the one hand, I will consider clinical and developmental studies showing how strongly interpersonal relations modulate the quality of introspective access. In this section, I will take into account Neisser's theory of self knowledge and Gergely and Watson's constructivist approach. On the other hand, I will consider the extended mind paradigm, a recent philosophical model that seems compatible with the idea that some important aspects of the self could also be extended to the ...