Full Idea
If inverted qualia, or absent qualia (zombies), are possible in functionally equivalent systems, qualia are not capturable by functional definitions.
Gist of Idea
Inverted qualia and zombies suggest experience isn't just functional
Source
Jaegwon Kim (Philosophy of Mind [1996], p.114)
Book Reference
Kim,Jaegwon: 'Philosophy of Mind' [Westview 1998], p.114
A Reaction
The point here (I take it) is that we don't have to go the whole hog of saying the qualia are therefore epiphenomenal, although that is implied. How about a fail-safe situation, where qualia do it for me, and something else does the same for zombies?