Intuitions play a central role in analytic philosophy, but their psychological basis is little understood. This paper provides an empirically-informed, psychological char- acterization of philosophical intuitions. Drawing on McCauley’s distinction between maturational and practiced naturalness, I argue that philosophical intuitions originate from several early-developed, specialized domains of core knowledge (maturational naturalness). Eliciting and deploying such intuitions in argumentative contexts is the domain of philosophical expertise, thus philosophical intuitions are also practiced nat- ural. This characterization has implications for the evidential value (...) of philosophical intuitions, as well as for the interpretation of studies in experimental philosophy. (shrink)