Full Idea
The nominalist superstition is based ultimately on the myth of the unmediated presentation of genuine concrete objects to the mind.
Gist of Idea
Nominalism assumes unmediated mental contact with objects
Source
Michael Dummett (Frege philosophy of mathematics [1991], Ch.18)
Book Reference
Dummett,Michael: 'Frege: philosophy of mathematics' [Duckworth 1991], p.231
A Reaction
Personally I am inclined to favour nominalism and a representative theory of perception, which acknowledges some 'mediation', but of a non-linguistic form. Any good theory here had better include animals, which seem to form concepts.