Full Idea
If psychological states are multiply realisable it is hard to see how they could possibly be translated into physical terms.
Gist of Idea
If mental states are multiply realisable, they could not be translated into physical terms
Source
Robert Kirk (Mind and Body [2003], §3.8)
Book Reference
Kirk,Robert: 'Mind and Body' [Acumen 2003], p.60
A Reaction
Reductive funtionalism would do it. A writing iimplement is physical and multiply realisable. Personally I prefer the strategy of saying mental states are NOT multiply realisable. If frog brains differ from ours, they probably don't feel pain like us.