Full Idea
It may not make sense to talk of states of consciousness except as the experiences of some conscious subject; and it may well be that this conscious subject can not be identified except by reference to his body.
Gist of Idea
Consciousness must involve a subject, and only bodies identify subjects
Source
A.J. Ayer (The Concept of a Person [1963], §IV)
Book Reference
Ayer,A.J.: 'The Concept of a Person etc' [Macmillan 1973], p.113
A Reaction
It strikes me that Ayer deserves more credit as a pioneer of this view. It tracks back to what may turn out to be the key difficulty for Descartes - how do you individuate a mental substance? I may identify me, but how do I identify you?