Full Idea
Spatial, temporal and causal relations are the only respectable candidates for relations for a physicalist.
Gist of Idea
For physicalists, the only relations are spatial, temporal and causal
Source
Howard Robinson (Perception [1994], V.4)
Book Reference
Robinson,Howard: 'Perception' [Routledge 2001], p.137
A Reaction
This seems to be true, and is an absolutely crucial principle upon which any respectable physicalist account of the world must be built. It means that physicalists must attempt to explain all mental events in causal terms.