Full Idea
On the account I have been developing, what makes it the case that someone is employing one concept rather than another is not constituted by his impression of whether he is, but by complex facts about explanations of his judgements.
Gist of Idea
Employing a concept isn't decided by introspection, but by making judgements using it
Source
Christopher Peacocke (A Study of Concepts [1992], 7.2)
Book Reference
Peacocke,Christopher: 'A Study of Concepts' [MIT 1999], p.194
A Reaction
I presume this brings truth into the picture, and hence establishes a link between the concept and the external world, rather than merely with other concepts. There seems to be a shadowy behaviourism lurking in the background.