Full Idea
Computational models of the brain/mind will not suffice for cognitive psychology. We cannot individuate concepts and beliefs without reference to the environment. Meanings aren't "in the head".
Gist of Idea
If concepts have external meaning, computational states won't explain psychology
Source
Hilary Putnam (Representation and Reality [1988], p.73)
Book Reference
Putnam,Hilary: 'Representation and Reality' [MIT 1992], p.73
A Reaction
Mr Functionalism quits!