Full Idea
The privacy that is a serious issue for the dualist is a peculiarly epistemic privacy that not even telepathy or brain fusions would seem to overcome.
Clarification
'Epistemic' privacy concerns what we can know, rather than how it is
Gist of Idea
Dualist privacy is seen as too deep for even telepathy to reach
Source
Georges Rey (Contemporary Philosophy of Mind [1997], 2.5.4)
Book Reference
Rey,Georges: 'Contemporary Philosophy of Mind' [Blackwell 1997], p.55
A Reaction
This is a key idea in the traditional defence of dualism. I'm inclined to think that we are faced with deep privacy not because the mind is so hidden, but because the observer is trapped in NOT being the thing observed. In that sense, rocks are private.