Abstract

This article is about the compatibility between a form of internalism about epistemic justification and a form of externalism in the philosophy of mind called active externalism. Justification internalism in epistemology is the thesis that epistemic justification depends only on features internal to the agent. Active externalism is the position that it is possible that some of our mental states are external, i.e., constituted in part by elements “outside our head” — this form of externalism is articulated by the extended mind thesis. Andy Clark and David Chalmers argued in favor of this position in “The Extended Mind” (1998). Some philosophers believe the extended mind thesis is incompatible with accessibilist internalism because of the justifying role introspection plays in this form of epistemic internalism. I argue that, despite initial appearances, the extended mind thesis is compatible with epistemic internalism; however, it might conflict with other assumptions internalists usually make. This article’s structure goes like this: (i) I present the extended mind thesis; (ii) I introduce accessibilist internalism, sometimes seen as incompatible with the previous position; (iii) I explain and evaluate different arguments regarding the compatibility between the two positions.