Full Idea
Quine's thesis of the indeterminacy of radical translation carries all the way in, as the thesis of the indeterminacy of radical interpretation of mental states and processes.
Clarification
Quine proposed that perfect translation of languages was logically impossible
Gist of Idea
Indeterminacy of translation also implies indeterminacy in interpreting people's mental states
Source
comment on Willard Quine (Word and Object [1960]) by Daniel C. Dennett - Daniel Dennett on himself p.239
Book Reference
'A Companion to the Philosophy of Mind', ed/tr. Guttenplan,Samuel [Blackwell 1995], p.239
A Reaction
Strong scepticism seems wrong here. Davidson's account of charity in interpretation, and the role of truth, seems closer.