O'Brien & Opie's vehicle hypothesis is an
attractive framework for the study of consciousness. To fully embrace
the hypothesis, however, two of the authors' claims should be
extended: first, since phenomenal content is entirely dependent on
occurrent brain events and only contingently correlated with external
events, it is no longer necessary to regard states of consciousness as
representations. Second, the authors' insistence that only stable
states of a neural network are conscious seems ad hoc.