Full Idea
If mental events are genuinely non-spatial, but not atemporal, its effect is to classify them as abstract; the distinction between the abstract and the mental simply collapses.
Gist of Idea
If the mental is non-spatial but temporal, then it must be classified as abstract
Source
Bob Hale (Abstract Objects [1987], Ch.3.1)
Book Reference
Hale,Bob: 'Abstract Objects' [Blackwell 1987], p.49
A Reaction
This is important. You can't discuss this sort of metaphysics in isolation from debates about the ontology of mind. Functionalists do treat mental events as abstractions.