Full Idea
My proposal is that people attempt to form prototypes as part of a larger knowledge structure when they learn concepts.
Gist of Idea
Learning concepts is forming prototypes with a knowledge structure
Source
Gregory L. Murphy (The Big Book of Concepts [2004], Ch.13)
Book Reference
Murphy,Gregory L.: 'The Big Book of Concepts' [MIT 2004], p.492
A Reaction
This combines theory theory (knowledge) with the prototype view, and sounds rather persuasive. The formation of prototypes fits with the explanatory account of essentialism I am defending. He later calls prototype formation 'abstraction' (494).