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Full Idea
Since the rejection of the classical theory of concepts (that they are definitions), three paradigms have successively emerged in the psychology of concepts: the prototype paradigm, the exemplar paradigm, and the theory paradigm.
Gist of Idea
Concepts as definitions was rejected, and concepts as prototypes, exemplars or theories proposed
Source
Edouard Machery (Doing Without Concepts [2009], 4)
Book Ref
Machery,Edouard: 'Doing Without Concepts' [OUP 2009], p.76
A Reaction
I am becoming a fan of the 'theory theory' proposal, because the concepts centre around what explains the phenomenon, which fits my explanatory account of essentialism. Not that it's right because it agrees with me, of course.....