Full Idea
Cartesians think that concept individuation is prior, in order of analysis, to concept possession.
Gist of Idea
Cartesians put concept individuation before concept possession
Source
Jerry A. Fodor (LOT 2 [2008], Ch.12)
Book Reference
Fodor,Jerry A.: 'LOT 2: the Language of Thought Revisited' [OUP 2008], p.12
A Reaction
Peacocke is someone who seems to put possession first, to the point where individuation is thereby achieved. The background influence there is Wittgenstein. I think I am more with Fodor, that concepts are entities, which need to be understood.