Full Idea
If the theory theory has a distinctive and coherent answer to the 'What's a concept?' question on offer, it's a well-kept secret.
Gist of Idea
The theory theory can't actually tell us what concepts are
Source
Jerry A. Fodor (Concepts:where cogn.science went wrong [1998], Ch.5)
Book Reference
Fodor,Jerry A.: 'Concepts: where cognitive science went wrong' [OUP 1998], p.117
A Reaction
Not an argument, but worth recording as an attitude. I certainly agree that accounts which offer some sort of answer to 'What is a concept?' have an immediate head's start on those which don't.