Once at the center of philosophy, the philosophy of concepts has now been marginalized, maybe because for a few years now, it has been stalled. The contrast with the psychology of concepts is stark. Psychologists working on categorization, induction, and reasoning have continued developing and refining their theories of concepts, discovering along the way a dazzling amount of phenomena. New work on prototypes in the 1990s and early 2000s, innovative ideas on causal cognition in the first decade of the twenty-first century, the development of the neo-empiricist approach to concepts, and the promising growth of the neuropsychology of concepts have rejuvenated the field
